• DAY1 2/5 Risk Area Posted

    From Mike Powell@618:250/6 to All on Fri May 29 10:00:20 2026
    ACUS01 KWNS 291242
    SWODY1
    SPC AC 291241

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0741 AM CDT Fri May 29 2026

    Valid 291300Z - 301200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR WEST TEXAS
    INTO FAR SOUTHWESTERN OKLAHOMA...

    ...SUMMARY...
    Scattered strong to severe storms capable of sporadic large hail and
    scattered severe winds are expected this afternoon and evening
    across portions of western Texas. More isolated severe thunderstorms
    are likely across parts of the central High Plains, southern Utah,
    and the northern Rockies.

    ...Southern Plains and central High Plains...

    Water-vapor imagery shows a mid-level low migrating eastward across
    the Mojave Desert towards the southern Great Basin. A 90-kt 250-mb sub-tropical jet over Baja and Sonora Mexico will progress eastward
    into the southern High Plains by this afternoon. The nose of this
    speed max will overspread a moist sector east of a dryline where
    severe thunderstorm development is forecast later this
    afternoon/evening. Farther north, a modestly deepening lee trough
    will focus storm initiation over the central High Plains.

    Despite some mid and high-level clouds, model guidance shows strong
    heating this afternoon and erosion of appreciable convective
    inhibition by mid afternoon. A mid-level disturbance implied in
    satellite imagery this morning over central NM will move northeast
    into western KS and the TX Panhandle by early evening. Scattered
    thunderstorms are forecast to develop near the dryline/lee trough.
    Forecast hodographs show some elongation across west TX due to the
    nose the upper speed max. Have included 15-percent hail
    probabilities where supercell development appears greatest [due in
    part to more favorable hodographs and within the northern rim of
    richer moisture sampled by the 12 UTC Del Rio, TX raob (17.3 g/kg
    mean mixing ratio)]. Large hail (1.5 to 2.5 inches in diameter)
    will be possible with the supercells. Severe gusts are forecast to
    become more prevalent during the evening as mergers and outflow
    consolidate into a few linear clusters. Severe gusts of 60-80 mph
    are possible as this activity shifts eastward into the Low Rolling
    Plains and southwest OK during the evening.

    Through the late evening, isentropic ascent near the terminus of the
    nocturnal jet may support elevated, loosely organized convection
    across portions of northwest OK and western KS. Isolated hail/wind
    may accompany the stronger storms over the central High Plains into
    central OK where storm coverage will probably remain isolated.

    ...Northern Rockies/Montana...

    Diurnally-driven orographic ascent within the terrain of northern ID
    and southwest MT will likely support isolated thunderstorm
    development by late afternoon given weak capping and northward
    advection of steep mid-level lapse rates. Residual low-level
    moisture across north-central MT (dewpoints in the upper 40s to low
    50s) coupled with 30-35 knot southerly mid-level flow will likely
    promote intensification and some degree of organization (possibly
    into transient supercells and/or organized bands) through the early
    evening hours. Sporadic large hail and severe gusts appear possible
    with the most intense convection as it spreads north towards the
    Canadian border.

    ...Southern Utah...

    A few high-based storms developing within a deeply mixed boundary
    layer (inverted-V profile) may yield an isolated risk for severe
    gusts (60-70 mph).

    ..Smith/Kerr.. 05/29/2026

    $$
    --- MultiMail/DOS
    * Origin: Project Scorpio TEST (618:250/6)
  • From Mike Powell@618:250/6 to All on Sat May 30 08:01:56 2026
    ACUS01 KWNS 300551
    SWODY1
    SPC AC 300549

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1249 AM CDT Sat May 30 2026

    Valid 301200Z - 311200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE CENTRAL
    HIGH PLAINS INTO CENTRAL KANSAS AND NORTH-CENTRAL OKLAHOMA...

    ...SUMMARY...
    Thunderstorms with large hail and severe wind gusts are expected on
    this afternoon and evening from parts of the central High Plains
    into central Kansas and north-central Oklahoma. Isolated severe
    gusts and hail will also be possible in the northern High Plains,
    and across parts of western Texas.

    ...Synopsis...
    Latest GOES imagery depicts a pronounced mid-level low over southern
    UT with a modest (25-35 knot) subtropical jet emanating from
    northern Mexico into the southern Plains. Several shortwave
    vorticity maximum are noted along the MS River Valley and across the
    Southeast within a broad upper-level deformation zone. Over the next
    12-24 hours, the low over southern UT will drift northeast, likely overspreading the central High Plains by late afternoon/early
    evening. As this occurs, more focused surface pressure falls and lee
    cyclone development will become apparent across eastern WY/CO and
    into portions of western KS/OK and the TX Panhandle.

    00 UTC RAOBs across the central to southern Rockies sampled very
    steep (8-9 C/km) lapse rates, which should advect eastward in the
    wake of ongoing convection through this afternoon given the
    southwesterly mid-level flow regime. Additionally, late-evening
    surface observations across the central CONUS reveal an expansive
    reservoir of rich low-level moisture with dewpoints in the upper 60s
    to mid 70s spanning from central OK into the Southeast. This
    moisture will advect west/northwest through the morning and
    afternoon hours in response to the surface pressure
    falls/cyclogenesis over the central High Plains.

    The combination of destabilizing thermal profiles aloft and
    increasing low-level moisture content will promote a broad swath of
    moderate to very high buoyancy from the central High Plains
    southward into the southern Plains. Thunderstorm development within
    this unstable air mass appears likely as ascent increases through
    the day along the surface trough/sharpening dryline.

    ...Central High Plains...

    35-45 knot southerly mid-level flow across the central High Plains
    will yield elongated hodographs with deep-layer shear vectors
    oriented off the dryline/surface trough. This will result in
    high-based supercell development initially across northeast
    CO/western NE into western SD with an attendant threat for large
    hail and strong outflow winds. With time, upscale growth is
    anticipated as convection spreads north/northeast across NE and SD
    with an increasing threat for severe winds.

    ...Central/Southern Plains...

    Most guidance depicts a sharpening dryline across western/central
    KS, western OK, and into western TX through the afternoon hours.
    More focused forcing for ascent across central KS to northern OK
    ahead of a subtle low-amplitude upper wave will likely favor
    scattered thunderstorm coverage with more isolated thunderstorms
    likely with southward extent into western TX. Although ample
    buoyancy will be in place (MLCAPE values between 3500-4500 J/kg),
    the primary limiting factor across the central/southern Plains will
    be modest deep-layer wind shear. Consensus among forecast guidance
    suggests effective bulk shear values on the order of 25-35 knots are
    likely, which will promote a combination of supercells and
    multicells. However, the steep lapse-rate environment coupled with
    sufficient deep-layer wind shear will support the potential for
    large hail along with severe wind gusts.

    A focused corridor for a tornado threat may emerge across northern
    OK to central KS where southeasterly low-level flow should support
    effective SRH on the order of 150-200 m2/s2. However, the tornado
    threat will likely be highly conditional on achieving a sustained
    supercell with balanced inflow/outflow. Given the increased
    convective signal across northern OK/KS, 15% hail/wind
    probabilities, as well as 2% tornado probabilities, have been introduced.

    ...Southwest Missouri into central Arkansas...

    A zone of isentropic ascent near 850 mb will become established
    across the Ozark Plateau by late afternoon. Isolated to scattered
    thunderstorms are likely within this corridor given MUCAPE values
    upwards of 3000 J/kg, and sufficient deep-layer wind shear should be
    in place for a few organized cells capable of large hail and perhaps strong/severe downburst winds.

    ..Moore/Marsh.. 05/30/2026

    $$
    --- MultiMail/DOS
    * Origin: Project Scorpio TEST (618:250/6)
  • From Mike Powell@618:250/10 to All on Sun May 31 08:48:12 2026
    ACUS01 KWNS 311222
    SWODY1
    SPC AC 311220

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0720 AM CDT Sun May 31 2026

    Valid 311300Z - 011200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING FROM
    EASTERN KANSAS INTO WESTERN MISSOURI...

    ...SUMMARY...
    A few severe storms are possible this evening from eastern Kansas
    into western Missouri.

    ...KS/MO...

    Moderately strong southwesterly flow aloft extends from the Four
    Corners region into the Midwest today. Water vapor imagery suggests
    several weak shortwave troughs embedded in the flow to aid in
    large-scale ascent and the potential for thunderstorm development
    later today. Thunderstorms are ongoing this morning over eastern
    KS/western MO. These storms will reinforce a surface boundary
    across southeast KS/southwest MO. The boundary will lift northward
    this afternoon with the potential for isolated thunderstorms along
    and south of it. Very warm and humid conditions will prevail across
    southeast KS/southern MO with MLCAPE values of 3000-4000 J/kg, along
    with steep low and mid-level lapse rates.

    While these early storms will pose an isolated severe threat, more
    organized convection is forecast to form by early evening over
    eastern KS and track along the boundary into MO. Forecast soundings
    suggest sufficient vertical shear to support supercells and bowing
    structures capable of large hail and damaging winds, or even a
    tornado. A small area of SLGT risk has been added to address this scenario.

    ...Elsewhere...

    Widely scattered thunderstorms capable of damaging wind gusts and
    hail will be possible this afternoon and early evening over parts of
    AR, and southwest TX. Isolated occurrences of large hail are also
    possible today from parts of the Dakotas into NE/IA.

    ..Hart/Kerr.. 05/31/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Mon Jun 1 09:03:39 2026
    ACUS01 KWNS 011213
    SWODY1
    SPC AC 011211

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0711 AM CDT Mon Jun 01 2026

    Valid 011300Z - 021200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE
    CENTRAL HIGH PLAINS...AND PARTS OF THE LOWER MS AND TN VALLEYS...

    ...SUMMARY...
    Thunderstorms with large hail and severe wind gusts are expected
    Monday afternoon and evening across parts of the central Plains.
    Scattered to numerous strong to severe wind gusts will also be
    possible from the Ozarks southeastward into parts of the Southeast.

    ...Southeast States...

    An occasionally severe MCS is ongoing this morning south of STL.
    This activity may persist through much of the day, tracking
    southeastward along the low-level moisture/instability gradient into
    western KY/middle TN and eventually north GA. Moderate CAPE values,
    30+ knots of mid-level steering flow, and mesoscale organization of
    the MCS will pose a risk of strong/damaging winds along this corridor.

    Along the western flank of this MCS, a hot/humid air mass will
    develop from AR into parts of TN/MS/AL with temperatures in the 90s
    and dewpoints in the 70s. This will yield afternoon MLCAPE values
    approaching 4000 J/kg. The consensus of model guidance suggests
    scattered thunderstorm development by late afternoon, with outflows
    congealing and spreading south/southwestward though a steep
    lapse-rate environment. The result will be the potential for rather
    widespread strong/severe storms capable of damaging wind gusts and
    some hail. These storms may spread as far south as central MS/AL
    during the evening before weakening.

    ...High Plains...

    Easterly low-level winds are present this morning over much of
    eastern CO/western KS. This will maintain an influx of moisture and
    aid in the development of scattered thunderstorms over the foothills
    of central CO by mid-afternoon. Sufficient deep-layer shear will
    pose a risk of supercells capable of large/very large hail. As the
    storms move/develop eastward into western KS this evening, supercell
    structures may persist, but upscale growth into bowing clusters is
    also expected. This will increase the risk of severe wind gusts as
    well. The easterly low-level jet will also strengthen considerably
    this evening across the region, enhancing low-level shear and
    helicity, but in a region with high LCLs and dewpoints only around 50F.

    Widely scattered severe storms are also expected to develop over
    southeast WY, spreading eastward into the NE panhandle and southwest
    SD with a risk of large hail and damaging wind gusts.

    ..Hart/Kerr.. 06/01/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Tue Jun 2 09:58:50 2026
    ACUS01 KWNS 021151
    SWODY1
    SPC AC 021149

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0649 AM CDT Tue Jun 02 2026

    Valid 021300Z - 031200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE
    NORTHERN PLAINS...

    ...SUMMARY...
    Thunderstorms with large hail, severe wind gusts and potentially a
    couple of tornadoes are expected this afternoon and evening in parts
    of the northern Plains. Strong wind gusts and marginal hail will
    also be possible in parts of the southern and central High Plains. A
    few severe wind gusts may also occur from southern Georgia into
    northern and eastern Florida.

    ...Northern Plains...

    The upper low that has affected the western U.S. for the last
    several days has lifted into Alberta, with broad 40-60 knot
    southwesterly mid-level flow across much of the northern Plains. A
    cold front currently extends from eastern WY into western ND, which
    will provide the primary focus for thunderstorm development later
    this afternoon. Forecast soundings across this area show strong
    deep-layer shear, steep lapse rates, and MLCAPE values around 2500
    J/kg. This suggests the potential for several supercells storms
    capable of large hail, damaging winds, and a tornado or two.

    Numerous thunderstorms over western KS this morning have overturned
    most of this air mass, and will likely suppress strong storms
    through the evening. However, ample moisture has surged westward
    into the foothills of CO where isolated strong storms may occur.

    ...Southeast TX...

    An outflow boundary associated with convective clusters over OK has
    surged southward into the Red River valley. A hot and humid air
    mass over southeast TX will be supportive of re-development of
    afternoon thunderstorms along this outflow boundary. Storms will
    likely track southward through the early evening, posing a risk of
    locally damaging wind gusts.

    ...Southwest TX/Southeast NM...

    Southeasterly low-level winds are present this morning over much of
    southwest TX and southeast NM, maintaining 50s dewpoints in the
    region and encouraging thunderstorms later today over the terrain.
    The storms that form will spread northeastward for a few hours,
    posing a risk of locally damaging wind gusts.

    ...FL/GA...

    An upper trough will track southward across the eastern states
    today. A moist and moderately unstable airmass will develop over
    much of FL and southern GA, with isolated afternoon thunderstorm
    development expected. The strongest cells may produce
    gusty/damaging winds.

    ..Hart/Kerr.. 06/02/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Wed Jun 3 09:04:22 2026
    ACUS01 KWNS 031153
    SWODY1
    SPC AC 031151

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0651 AM CDT Wed Jun 03 2026

    Valid 031300Z - 041200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
    EVENING FROM NORTHERN NEBRASKA INTO THE EASTERN DAKOTAS AND WESTERN MINNESOTA...

    ...SUMMARY...
    Thunderstorms with large hail, severe wind gusts, and a few
    tornadoes will be possible this afternoon and evening in parts of
    the northern Plains into upper Mississippi Valley. More sporadic
    occurrences of large hail and severe wind gusts appear possible
    across parts of the central High Plains and southwest Texas into
    southern New Mexico.

    ...Northern Plains...

    Morning water vapor loop shows an upper low over southern Alberta,
    with several shortwave troughs embedded in the southwesterly flow
    over MT/WY/ID. At the surface, the primary cold front will move
    eastward into the central Dakotas and northwest NE by afternoon,
    providing the focus for scattered thunderstorm development.

    A broad cluster of weakening thunderstorms is occurring this morning
    near the NE/SD border. This activity has resulted in an outflow
    boundary that will lift northward into SD this afternoon. Dewpoints
    in the upper 60s and MLCAPE over 3000 J/kg are expected in the
    region along/north of the outflow boundary, with forecast soundings
    showing favorable deep-layer shear for supercell storms. These
    storms will persist through the evening, affecting eastern SD,
    southeast ND, and western MN. Large hail is the primary risk early,
    with a transition to more linear structures during the evening and
    an attendant damaging wind risk. Recent model guidance suggests a
    notable low-level jet in this region during the late
    afternoon/evening, supportive of some risk of maintaining discrete
    modes and increasing the risk of a few tornadoes.

    ...Elsewhere...

    Farther south, widely scattered strong storms are expected later
    today across the central High Plains, and southwest TX/southern NM.
    Locally damaging wind gusts are the main risk.

    ..Hart/Kerr.. 06/03/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Thu Jun 4 08:22:43 2026
    ACUS01 KWNS 041200
    SWODY1
    SPC AC 041158

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0658 AM CDT Thu Jun 04 2026

    Valid 041300Z - 051200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
    EVENING OVER PORTIONS OF THE NORTHERN PLAINS....

    ...SUMMARY...
    Severe thunderstorms capable of large to very large hail and
    damaging winds are possible today from parts of the northern High
    Plains across northern Nebraska and much of South Dakota. More
    isolated occurrences of large hail and damaging winds appear
    possible farther south across portions of the central Plains.

    ...MT/Dakotas/MN...

    Fast zonal flow is present today over the northern U.S, with a
    shortwave trough now over western MT approaching the northern High
    Plains. Easterly low-level winds have transported 50s dewpoints
    westward into southeast MT/northeast WY, where daytime heating and
    increasing large-scale ascent will lead to scattered afternoon
    thunderstorms. Coverage of storms is not expected to be very high,
    but those cells that can develop will likely be supercells capable
    of large hail and damaging wind gusts. Storms will spread into the
    central Dakotas through the evening with a continued severe threat.

    Farther east, a surface boundary is forecast to extend from
    south-central SD into central MN. Strong heating in this corridor
    will promote scattered thunderstorms after 20z. Forecast soundings
    suggest an environment favorable for hail and damaging winds in the
    strongest cells.

    ...KS/NE/IA...

    A weak upper trough has emerged from the central/southern High
    Plains overnight and is now moving across western KS. Radar loops
    show an MCV near Hays KS that will track into southeast NE and
    western IA later today. A combination of low-level convergence,
    daytime heating, and the affects of the MCV will lead to scattered
    afternoon thunderstorms from northeast KS into IA. CAPE values of
    2000-3000 J/kg are expected, along with sufficient deep-layer shear
    for multicell or perhaps supercell storm structures. The potential
    exists for hail and damaging wind gusts in the stronger cells this
    evening. An upgrade to SLGT was considered, but the shield of
    clouds/precip in vicinity of the MCV limits confidence in heating
    and the area of greatest concern at this time.

    ..Hart/Kerr.. 06/04/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Fri Jun 5 09:50:36 2026
    ACUS01 KWNS 051201
    SWODY1
    SPC AC 051200

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0700 AM CDT Fri Jun 05 2026

    Valid 051300Z - 061200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
    EVENING FROM NEBRASKA/KANSAS INTO NORTHERN ILLINOIS...

    ...SUMMARY...
    Thunderstorms with large hail and severe wind gusts are expected to
    develop late this afternoon and evening from parts of the central
    Plains into the mid Missouri and mid Mississippi Valleys. Isolated
    severe wind gusts and hail will also be possible in parts of the
    upper Mississippi Valley.

    ...NE to IA...

    A large upper ridge is present today across the southern U.S., with
    stronger westerlies over the northern tier of states. One shortwave
    trough is noted over SD tracking east-southeastward. This feature
    will provide large-scale ascent to parts of the Midwest states
    today, leading to scattered clusters of thunderstorms. One area of
    expected convective initiation will be late this afternoon along a
    retreating surface boundary extending from south-central NE into
    southern IA. Ample low-level moisture will reside in the frontal
    zone with dewpoints in the low 70s and MLCAPE values over 3000 J/kg.
    Activity should develop around 00z along the boundary and track
    slowly eastward. Sufficient deep-layer shear suggests a risk of
    supercells capable of large hail. Low-level winds are not expected
    to be particularly strong, limiting a more robust tornado risk.
    Activity will likely congeal and track eastward across southern
    IA/northern MO and eventually northern IL through the evening with a hail/damaging wind risk.

    ...Northern IL to Lower MI...

    A large decaying MCS is moving across northern MO this morning.
    While this activity will likely remain non-severe through the
    morning, potential for re-intensification exists this afternoon as
    activity moves into northern IN and southern lower MI. If
    sufficient daytime heating can occur, steep lapse rates and
    mesoscale organization of the MCS could result in sporadic damaging winds.

    ...MI/WI...

    A broad area of 60s dewpoints and broken cloud cover will lead to
    moderate CAPE values this afternoon from southern MN into much of
    WI. As the aforementioned shortwave trough approaches this
    afternoon, cooling aloft and strengthening wind fields will promote
    organized structures with any convection that can form. Model
    guidance varies considerably on the cover of storms in this area,
    but a conditional risk of large hail and damaging winds is present.
    Will maintain only MRGL risk for this area for now, but an upgrade
    to SLGT could be needed today if later model guidance indicates
    greater coverage of afternoon/evening storms.

    ..Hart/Wendt.. 06/05/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Sat Jun 6 10:03:30 2026
    ACUS01 KWNS 061201
    SWODY1
    SPC AC 061200

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0700 AM CDT Sat Jun 06 2026

    Valid 061300Z - 071200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
    EVENING FROM INDIANA INTO THE UPPER OHIO VALLEY AND SOUTHERN NEW
    ENGLAND...AND OVER PARTS OF EASTERN MONTANA AND WESTERN NORTH DAKOTA...

    ...SUMMARY...
    Thunderstorms with damaging wind gusts and isolated large hail are
    expected to develop later today from parts of the lower Great Lakes
    and Ohio Valley into southern New England. Large hail and severe
    wind gusts are also expected in the northern High Plains and
    southern Plains.

    ...Indiana to Southern New England...

    Morning water vapor loop shows a deepening upper trough over the
    Great Lakes region. This trough and an associated mid-level speed
    max will spread across the upper Ohio Valley into New England this
    afternoon and tonight. Strengthening large-scale ascent ahead of
    the trough has led to multiple clusters of ongoing thunderstorms
    from eastern IL into parts of OH/PA/NY. One or more of these
    clusters, along with new development by early afternoon, is expected
    to intensify and spread across the SLGT risk region. Forecast
    soundings suggest sufficient CAPE and low-level lapse rates to
    support a risk of damaging wind gusts with this activity. Overnight
    CAM solutions continue to vary on the likely corridor of greatest
    concern. However, there is the potential for a rather widespread
    damaging wind event across parts of PA/NY/NJ this afternoon/evening
    if sufficient heating and mesoscale organization of the clusters occur.

    ...Northern High Plains...

    A large upper ridge is in place today over the High Plains region.
    A southerly low-level jet is expected to intensify by early evening
    as an upper trough approaches and low-level cyclogenesis occurs over
    southeast MT. This should encourage the development of evening
    thunderstorms across eastern MT tracking into western ND overnight.
    It is unclear whether the bulk of these storms will be just west of
    the warm sector and elevated, or will be surface-based. Regardless,
    large hail is the primary concern.

    ...Southern Plains...

    A weak upper low is tracking northeastward from west TX into
    Oklahoma this morning. A band of stronger winds aloft to the east of
    the low, coupled with pockets of daytime heating and ample moisture,
    will promote damaging wind gusts and hail in the strongest storms.

    ..Hart/Wendt.. 06/06/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Mon Jun 8 09:58:55 2026
    ACUS01 KWNS 081204
    SWODY1
    SPC AC 081203

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0703 AM CDT Mon Jun 08 2026

    Valid 081300Z - 091200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
    EVENING FROM NORTHEAST COLORADO AND SOUTHEAST WYOMING INTO PARTS OF
    NEBRASKA AND KANSAS....

    ...SUMMARY...
    Scattered thunderstorms with large to very large hail, severe wind
    gusts potentially above 70 mph, and a few tornadoes will be possible
    today from the Front Range east-southeastward into the central
    Plains. Isolated severe gusts and hail will also be possible in
    parts of the southern High Plains, northern Plains and mid
    Mississippi Valley. An isolated hail threat may develop toward the
    end of the period in the northern High Plains.

    ...Eastern CO into Western NE/KS...

    Relatively fast southwest flow aloft is present today from the
    southwest states into the central Rockies. A surface low will
    remain over southwest KS through the day, maintaining a stream of
    easterly low-level winds and moist advection into eastern CO and
    northwest KS. Daytime heating will further aid the westward
    transport of moisture, resulting in an unstable air mass over the
    foothills near Denver/CO Springs. Thunderstorms are expected to
    develop in this corridor this afternoon, in an environment of steep
    mid-level lapse rates, CAPE around 1000 J/kg, and favorable
    deep-layer shear. Supercell structures capable of large hail will
    be the main early threat. As this activity moves/builds eastward
    into the Plains, it will encounter increasingly moist/unstable air
    and strengthening low-level shear profiles by early evening. This
    will promote a risk of a few supercell tornadoes, large hail, and
    damaging winds. An upgrade to ENH risk may be needed in later
    updates as clouds/daytime heating and affects of ongoing NE
    convection is assessed.

    By mid-evening, the activity is expected to be organizing upscale
    into linear structures as it moves into southwest NE and northwest
    KS. An increasing risk of damaging winds will likely develop, with
    storms spreading eastward into the overnight hours.

    ...Northwest AR...

    A cluster of intense thunderstorms is ongoing this morning over
    southwest MO/northeast OK. This activity could continue to pose a
    risk of isolated damaging wind gusts through the morning into
    northwest AR before weakening later today.

    ...Southern KS/Northwest OK/TX Panhandle...

    A dryline will become established this afternoon from the eastern TX
    Panhandle to the surface low in south-central KS. Hot conditions
    along/west of the dryline will help to initiate isolated
    thunderstorms. These high-based cells could pose an occasional
    threat of hail and damaging winds for a few hours.

    ...Eastern KS...

    A moist and very unstable air mass will lie across eastern KS today
    with CAPE values of 3000-4000 J/kg, but with a weak cap. CAM
    guidance varies on the potential for afternoon/early evening
    thunderstorms in this area, but enough 00z runs suggested a threat
    to maintain the SLGT. Any storm that can form would pose a risk of
    large hail and damaging winds.

    ...Southern IL/Western KY...

    An upper trough continues to lift northeastward across the mid MS
    valley today, with a moist/moderately unstable air mass present from
    southern IL southward. Mid-level lapse rates are marginal for
    severe storms, and winds aloft are modest. Nevertheless, veering winds-with-height and sufficient CAPE will pose an occasional risk
    of strong storms capable of gusty winds or a tornado today.

    ..Hart/Wendt.. 06/08/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Fri Jun 12 09:29:44 2026
    ACUS01 KWNS 121250
    SWODY1
    SPC AC 121248

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0748 AM CDT Fri Jun 12 2026

    Valid 121300Z - 131200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE EAST
    AND THE SOUTH-CENTRAL HIGH PLAINS...

    ...SUMMARY...
    Strong to severe storms capable of damaging winds are expected
    across parts of the Appalachians, Mid-Atlantic, and Northeast,
    mainly this afternoon and evening. Severe storms with a threat of
    large hail and severe wind gusts will also be possible across parts
    of the south-central High Plains.

    ...East including Appalachians to the Northeast/Mid-Atlantic...

    A vigorous mid/upper-level shortwave trough will move over Quebec
    later today, with some strengthening of westerlies aloft and weak
    mid-level height falls to its south across parts of the Appalachians
    and Northeast/Mid-Atlantic States. The strongest deep-layer flow
    will remain north of the international border, but modest effective
    shear (generally 20-30 kt) will overlap relatively strong heating
    and modest buoyancy across parts of the Northeast/Mid Atlantic.
    Scattered outflow-driven clusters may develop with time and move
    eastward, with an attendant threat of damaging wind and perhaps a
    few instances of marginally severe hail.

    Deep-layer flow/shear will be even weaker into parts of the southern Mid-Atlantic/Carolinas vicinity. However, very strong heating of a
    moist airmass will support potential for scattered thunderstorms
    with downburst potential, and eventual evolution into loosely
    organized clusters capable of damaging outflow winds this afternoon
    through at least the early evening hours.

    ...South-central High Plains...

    Moist southerly low-level flow beneath steepening mid-level lapse
    rates will result in robust destabilization from the Raton Mesa
    vicinity into the adjacent south-central High Plains, with MLCAPE
    increasing to near 2000 J/kg by late afternoon. Modest westerly
    mid/upper-level flow will support effective shear of 30-40 kt
    (highest values north), conditionally supportive of organized
    convection. Large-scale ascent will remain subtle, but eventual
    storms may develop by late afternoon near the higher terrain, and
    spread east-southeastward with time.

    Initial storms could evolve into isolated supercells, with a threat
    of large hail, localized severe gusts, and possibly a tornado.
    Consolidating outflow and a nocturnally strengthening southerly
    low-level jet will support some upscale growth during the evening,
    with an attendant severe-wind threat expected to spread across parts
    of the south-central High Plains, potentially including parts of
    southern Kansas, western Oklahoma and the Texas Panhandle.

    Farther south, more isolated strong to severe storms will be
    possible across parts of central/eastern New Mexico into Far West
    Texas, with a threat of isolated hail and localized severe gusts,
    mainly late this afternoon through early evening.

    ...Central/eastern Nebraska and far western Iowa...

    Elevated convection may develop late in the period, in the predawn
    hours of Saturday, from parts of central/eastaen Nebraska into
    western Iowa, within a warm-advection regime to the north of a warm
    front. Guidance continues to vary regarding the magnitude of
    elevated moistening/destabilization (which may be affected by MCS
    development to the south across Kansas) and coverage of storms prior
    to the end of the forecast period 12z Saturday. Effective shear will
    be sufficient for at least modest storm organization and an isolated
    hail threat, if sufficient destabilization can occur. Hail-related probabilities may ultimately be warranted for tonight, but will
    defer an additional outlook cycle for additional
    observational/upper-air data.

    ...Upper Midwest...

    Relatively low-topped convection may develop late this afternoon
    from the eastern Dakotas into Minnesota near/ahead of a cold front,
    as low-level lapse rates steepen beneath seasonably cool
    temperatures aloft. Robust west-northwesterly flow aloft will
    conditionally favor some storm organization, if sufficient buoyancy
    can develop. However, most guidance depicts MLCAPE generally below
    500 J/kg, with an inconsistent signal for where the deepest
    convection might develop. Some threat for marginal hail and/or
    locally damaging wind could evolve across some part of this region,
    and probabilities may be needed if confidence increases regarding
    sufficient destabilization and storm coverage.

    ...Oklahoma/North Texas...

    On the western/southern periphery of morning convection, robust
    pulse-type thunderstorm redevelopment cannot be ruled out across
    parts of southern Oklahoma and North Texas near outflow/surface
    front. Moderate to strong buoyancy and modest deep-layer shear could
    result in localized hail/wind, but it currently appears that
    organized severe thunderstorm potential will remain low.

    ..Guyer/Broyles.. 06/12/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Sun Jun 14 08:16:43 2026
    ACUS01 KWNS 141256
    SWODY1
    SPC AC 141254

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0754 AM CDT Sun Jun 14 2026

    Valid 141300Z - 151200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHEAST/APPALACHIANS/MID-ATLANTIC STATES...

    ...SUMMARY...
    Scattered severe thunderstorms capable of damaging wind gusts and
    some hail are expected across the Upper Ohio River Valley and Northeast/Mid-Atlantic States during the afternoon and evening.

    ...Upper Ohio Valley to New England...

    A shortwave trough will steadily amplify over the Great Lakes with a
    moderately strong belt of southwesterly mid-level flow across the
    region. Near/ahead of the eastward-moving cold front, increasing
    thunderstorm development is expected into the afternoon, increasing
    in both coverage and intensity. Ample mid-level height falls and
    around 40 kt of front-parallel effective shear could support a few initial/semi-discrete supercells prior to more prevalent
    upscale-growing linear modes, with the primary concern being
    damaging wind gusts. A brief tornado and/or hail could also occur
    given the relative strength of the wind profiles.

    ...Mid-Atlantic to southern Appalachians/Carolinas...

    Widely scattered thunderstorms are expected ahead of the cold front
    during the afternoon, generally focusing on a pre-frontal trough as
    well as high terrain/Blue Ridge vicinity, with some additional sea
    breeze augmentations across the Carolinas/coastal plain. From
    roughly southern/eastern Virginia southward, upper 60s to lower 70s
    F dewpoints and diurnally steepening low-level lapse rates will
    yield a corridor of strong surface-based buoyancy ahead of
    storm development. Despite weaker deep-layer shear and limited
    midlevel height falls with southward extent, the strongly unstable
    air mass will favor eastward-moving thunderstorm clusters capable of
    producing damaging wind gusts.

    Somewhat stronger mid-level westerlies will reside over the
    Mid-Atlantic region, contributing to 30-40 kt of effective shear
    amid moderate surface-based buoyancy. This environment will support
    several organized clusters capable of scattered damaging wind gusts,
    and some locally higher concentrations of wind damage will be
    possible with any longer-lived clusters that evolve.

    ...Southern High Plains...

    Along the tail-end of a composite cold front/outflow boundary
    extending westward into the southern Rockies/High Plains, widely
    scattered thunderstorms will spread southeastward during the
    afternoon. Given moist easterly low-level flow and 30-40 kt of
    effective shear along the boundary, a couple loosely organized
    storms will pose a risk of locally severe gusts and hail across
    parts of eastern New Mexico and far west Texas. Additional storms
    are expected along the boundary extending eastward across
    northern/central Texas to the ArkLaTex, though weaker deep-layer
    shear should limit storm longevity/organization.

    ..Guyer/Broyles.. 06/14/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Thu Jun 18 07:39:13 2026
    ACUS01 KWNS 180551
    SWODY1
    SPC AC 180549

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    1249 AM CDT Thu Jun 18 2026

    Valid 181200Z - 191200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM KENTUCKY INTO
    THE MID ATLANTIC...OVER MUCH OF THE NORTHEAST...AND ALONG THE
    NORTHERN GULF COAST...

    ...SUMMARY...
    Isolated to scattered severe thunderstorms will be possible from
    Kentucky to the Mid-Atlantic, with primarily damaging wind gusts or
    marginal hail. Scattered severe storms are possible from upstate New
    York into New England, with damaging gusts or even a tornado. A few
    tornadoes may occur over parts of the Gulf Coast states, and
    scattered storms may produce gusty winds or marginal hail from
    Oklahoma into northwest Texas.

    ...From KY into the Mid Atlantic...

    Moderate mid to high level westerlies will exist from the OH Valley
    to Mid Atlantic, south of the primary wave over the Northeast. This
    region will be south of the midlevel drying, with ample low-level
    moisture remaining in place ahead of the slower moving portion of
    the front. Scattered storms may be ongoing early in the day from KY
    into WV, with perhaps wind or even tornado potential as SRH will be
    high at that time. As heating occurs during the day, boundary layer
    mixing as well as veering and weakening winds at 850 mb may reduce
    tornado risk. However, ample deep-layer shear and nearly
    unidirectional wind profiles will favor both cells and fast-moving
    clusters of storms producing damaging gusts and locally severe hail
    throughout the day.

    ...Northeast...

    Within a broader area of cyclonic flow aloft, a leading shortwave
    trough will move from the Lower Great Lakes into the Northeast, with
    a 90 kt midlevel speed max and cooling aloft moving across NY and
    parts of New England during the day. Low pressure will develop into
    southern Quebec, with a cold front extending southward into the region.

    Surface heating and gusty south winds will bring 60s F dewpoints
    into the area with up to 1000 J/kg MUCAPE expected. Relatively warm
    profiles will develop near 300 mb, somewhat limiting storm depth.
    However, ample midlevel cooling will still support sufficient
    destabilization. Strong deep-layer shear and backed surface winds
    ahead of the cold front will favor low-topped supercells. Cells
    should develop over northern NY by 18Z, and will move quickly east,
    producing marginal hail and sporadic damaging gusts initially. The
    low EL height may mitigate hail production somewhat. By late
    afternoon, a tornado or two will be possible as storms encounter a
    stronger SRH environment farther east.

    ...Parts of MS/AL/GA/FL...

    Wind fields associated with the remnants of Arthur will increase
    from LA into GA today, as a weak surface low and midlevel wave move
    across MS/AL/GA. This system will provide a focus for storms which
    will spread northeast out of LA/MS into AL, the FL Panhandle, and
    eventually into GA. Although temperatures aloft are warm, areas of
    strong low-level shear and mid 70s F dewpoints will support
    organized bands of storms, some with embedded stronger cells.
    Transient supercells will be possible with localized tornado risk.
    Storms are likely to be ongoing over southeast LA and southern MS at
    the start of the period, and these will develop northeastward
    throughout the day.

    ...OK into northwest TX...

    An east-west oriented cold front will move southward across the TX
    Panhandle, Oklahoma and northwest today, pushing well south of the
    stronger westerlies aloft over the central Plains. The air mass
    ahead of the front will feature 70s F dewpoints, while daytime
    heating brings MUCAPE values into the 3000-4000 J/kg range. South of
    this cold front, low pressure is forecast to develop over western TX
    where the strongest heating will occur.

    Isolated morning thunderstorms may be present from the KS/OK border
    area eastward toward the Ozarks, and marginal hail cannot be ruled
    out due to substantial elevated CAPE. Any storms that form near the
    boundary as it moves south during the day may produce locally strong
    gusts. The greatest risk of locally severe gusts or marginal hail
    appears to be across southwest OK into northwest TX, where the front
    will be more favorably timed with peak heating. Shear will be weak,
    but extensive outflow is possible.

    ..Jewell/Weinman.. 06/18/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/6 to All on Sun Jun 21 16:52:22 2026
    ACUS01 KWNS 211242
    SWODY1
    SPC AC 211240

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0740 AM CDT Sun Jun 21 2026

    Valid 211300Z - 221200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM PARTS OF THE
    CENTRAL PLAINS INTO THE MID MISSISSIPPI AND LOWER OHIO VALLEYS...

    ...SUMMARY...
    Scattered severe thunderstorms should occur from the central High
    Plains into the mid Mississippi and lower Ohio Valleys, mainly this
    afternoon into tonight. Large to very large hail, severe/damaging
    winds (some 75+ mph), and tornadoes will all be possible. Some
    potential for strong tornadoes may develop across parts of Missouri,
    Illinois, and Indiana during the afternoon and evening.

    ...Central Plains to the Mid Mississippi and Lower Ohio Valleys...
    An MCS with a convectively augmented parent MCV extends from parts
    of central MO into southeast KS/northern OK this morning. The
    airmass downstream of this MCS across MO is not particularly
    unstable, but greater low-level moisture and related instability is
    present across northeast OK and vicinity. Current expectations are
    for the MCS/MCV to continue eastward across the mid MS Valley and
    Ozarks through the morning while posing an isolated threat for
    severe/damaging winds. With time, some re-invigoration of the MCS
    appears possible into the lower OH Valley as destabilization occurs
    with daytime heating. Trailing outflow from the morning convection
    will serve as a focus for additional thunderstorms later today as a compact/enhanced low-level jet moves eastward from the Ozarks into
    the mid MS/lower OH Valleys.

    There still appears to be potential for more robust thunderstorm
    development this afternoon across these areas along and south of the
    outflow boundary/front. Moderate instability will likely develop in
    the presence of 30-40 kt of deep-layer shear, which will be
    sufficient to support supercells. Enhanced low-level shear will also
    be present owing to the eastward-migrating low-level jet. This will
    foster a risk for tornadoes with any sustained supercells, and a
    strong tornado appears possible. Considered greater tornado
    probabilities and a categorical upgrade in a narrow corridor across
    parts of MO/IL/IN, but there remains too much uncertainty regarding
    sufficient destabilization in the wake of the morning activity. The severe/damaging wind threat will also increase, with the potential
    for multiple clusters to form and track eastward into the lower OH
    Valley through the evening and early overnight hours.

    Convective development should also occur farther west along/near the
    composite outflow boundary/front across the Ozarks into southern
    KS/northern OK by peak afternoon heating. Strong instability and
    moderate deep-layer shear will likely support updraft organization
    and a mix of supercells and multicell clusters. Large to very large
    hail should be the primary threat initially, but deep-layer shear
    vectors aligned largely parallel to the boundary should foster
    convective mergers and an increasing threat for severe/damaging
    winds with multiple clusters that should form and spread
    east-southeastward across OK and the Ozarks through the evening. At
    least an isolated severe wind threat may persist overnight with
    southward extent across the southern Plains into AR given the large
    degree of buoyancy forecast.

    A mid-level shortwave trough over WY this morning will move
    east-southeastward towards the central High Plains by this
    afternoon. Enhanced westerly flow aloft attendant to this shortwave
    trough will overspread the central High Plains through the day. A
    convectively reinforced front extends from northwest OK into the
    central High Plains, and modest low-level upslope flow is forecast
    to the north of this boundary today. Recent short-term guidance
    continues to suggest that moderate instability will develop with
    filtered daytime heating in the presence of steep mid-level lapse
    rates and strong effective bulk shear. Isolated supercells that can
    develop in this regime across eastern CO into western NE/KS should
    pose mainly a large to isolated very large (2+ inches) hail risk
    initially, before some clustering/upscale growth possibly occurs
    this evening. Scattered severe/damaging winds would become an
    increasing concern if this mode transition occurs, and isolated
    significant gusts (75+ mph) appear possible.

    ..Gleason/Broyles.. 06/21/2026

    $$


    --- ScorpioWeb v0.33a (Linux/x86_64)
    * Origin: Project Scorpio TEST (618:250/6)
  • From Mike Powell@618:250/10 to All on Mon Jun 22 07:52:57 2026
    ACUS01 KWNS 221240
    SWODY1
    SPC AC 221238

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0738 AM CDT Mon Jun 22 2026

    Valid 221300Z - 231200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM PARTS OF THE
    SOUTHEAST TO THE MID-ATLANTIC...AND ACROSS PORTIONS OF THE
    NORTHERN/CENTRAL HIGH PLAINS...

    ...SUMMARY...
    Scattered severe thunderstorms capable of producing damaging winds
    and perhaps a couple of tornadoes should occur mainly this afternoon
    and evening across portions of the Mid-Atlantic into the Southeast.
    Widely scattered severe thunderstorms are also expected across the northern/central High Plains, with large to very large hail the main threat.

    ...ArkLaTex into the Mid-South and Southeast...

    A weakened but persistent MCS continues this morning across AR into
    northeast TX. This cluster will track east-southeastward towards the
    lower MS Valley over the next few hours while gradually weakening.
    But, it should still pose some risk for isolated to widely scattered
    damaging winds in the short term. The convectively augmented MCV
    attendant to the ongoing MCS will also move east-northeastward
    across the lower MS Valley and Mid-South/central Gulf Coast states
    through the day. Gradual destabilization of a rather moist low-level
    airmass (surface dewpoints generally in the low to mid 70s) should
    occur, even with widespread cloudiness hampering daytime heating to
    some extent. Modestly enhanced westerly mid-level flow associated
    with the MCV and broad upper troughing over the eastern CONUS should
    support sufficient deep-layer shear for modest updraft organization.
    Multiple clusters and perhaps marginal supercells capable of
    producing mainly scattered damaging winds should develop along/south
    of a front this afternoon, and spread eastward across much of the
    Southeast through at least the early evening. A tornado or two may
    also occur in close proximity to the MCV track, but low-level flow
    is forecast to be fairly veered and modest.

    ...Mid-Atlantic...

    A mid-level shortwave trough will move eastward today from the OH
    Valley into the Mid-Atlantic. Recent visible satellite imagery shows
    fairly expansive cloud cover over much of the northern Mid-Atlantic,
    with clearer skies farther south into southern VA and vicinity. 12Z
    observed soundings across this region show poor lapse rates aloft,
    which should hamper any more than weak instability developing this
    afternoon, even with filtered daytime heating. Still, strengthening
    mid-level westerly winds and large-scale ascent preceding the
    shortwave trough will likely encourage scattered to numerous
    thunderstorms to develop this afternoon across the higher terrain of
    the central Appalachians and Blue Ridge Mountains. These multicell
    clusters should pose a threat for mainly scattered damaging winds as
    they spread east-northeastward towards the Atlantic Coast through
    the afternoon and evening. Marginal hail may occur with the
    strongest cores. A couple of tornadoes appear possible along/near a
    sharpening warm front in the MD/PA/NJ/DE vicinity, where low-level
    shear may become locally enhanced.

    ...Northern/Central High Plains...

    Within a generally zonal mid-level pattern, isolated to widely
    scattered thunderstorms are expected to develop this afternoon and
    evening across parts of the northern/central High Plains in a modest
    low-level upslope flow regime. Moderate instability will be aided by
    the presence of steep mid-level lapse rates, and 40-50 kt of
    deep-layer shear will easily support supercells with an attendant
    threat for large to very large hail. These supercells may be fairly
    widely spaced, but will likely track south-southeastward through at
    least the early evening before weakening. A couple of tornadoes may
    occur with these supercells, particularly across parts of the NE
    Panhandle into northeast CO, where the best combination of low-level
    moisture, effective SRH, and favorable convective mode should
    overlap for a few hours. Latest short-term guidance continues to
    show low potential for upscale growth/MCS development tonight, but
    trends will be monitored.

    ..Gleason/Bunting.. 06/22/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)
  • From Mike Powell@618:250/10 to All on Thu Jun 25 10:20:10 2026
    ACUS01 KWNS 251250
    SWODY1
    SPC AC 251248

    Day 1 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0748 AM CDT Thu Jun 25 2026

    Valid 251300Z - 261200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    THE SOUTHERN/CENTRAL PLAINS...

    ...SUMMARY...
    Scattered severe thunderstorms should develop today across parts of
    the southern/central Plains, with large hail and severe/damaging
    winds possible. A more focused corridor of tornado potential should
    exist this afternoon/evening across northern Oklahoma and southern
    Kansas, where a strong tornado may occur.

    ...Southern/Central Plains into the Ozarks...

    Severe potential today across the southern/central Plains will be
    heavily influenced by ongoing convection this morning extending from
    western KS into northeast OK. These thunderstorms are largely tied
    to modest warm/moist advection at low levels, evidenced by recent
    VWPs across this area (KDDC/KVNX/KINX) and the 12Z observed OUN
    sounding. Latest surface analysis indicates a weak surface low is
    present across southeast CO, with a front extending eastward from
    this low across KS. A secondary boundary/warm front was also
    analyzed along/near the KS/OK border, with generally 70s surface
    dewpoints and greater instability present to its south. The
    thunderstorms across western KS have recently strengthened, with
    evidence of a leading supercell and some attempt at clustering just
    to its west with a possible/developing MCV circulation. This
    activity may pose at least an isolated hail/wind threat through the
    morning as it tracks eastward across southern KS. But, it may tend
    to remain somewhat elevated to the north of the warm front.
    Accordingly, the overall severe threat with this convection is
    uncertain. Reference Mesoscale Discussion 1307 for more details on
    the short-term severe threat across KS.

    The net effect of the morning convection may be to reinforce the
    boundary across northern OK/southern KS. Most guidance continues to
    suggest that a narrow corridor of moderate to strong instability
    will exist this afternoon from southeast CO (to the east of the weak
    surface low) east-southeastward into southern KS/northern OK.
    Additional thunderstorm development is anticipated across this area
    later today as a weak mid-level shortwave trough ejects eastward
    over the central High Plains. With strong deep-layer shear expected,
    initial supercells should pose a threat for large hail and severe
    gusts. But, convective mode will probably tend to become mixed/messy
    quickly, as thunderstorms interact/merge with each other. Low-level
    shear is forecast to markedly increase near the surface boundary
    across southern KS/northern OK through the afternoon and evening as
    a southerly low-level jet strengthens. Elongated/curved hodographs
    suggest a threat for a few tornadoes will exist, especially with any thunderstorms that can remain at least semi-discrete. And given the
    enhanced effective SRH near the boundary, a strong tornado appears
    possible if a supercell mode can be maintained.

    Higher-based convection should develop farther south into the
    southern High Plains this afternoon, where a more deeply mixed
    airmass suggests a greater threat for scattered severe/damaging
    winds. But, some hail could also occur with the stronger cores. This
    activity should tend to cluster and spread eastward across northwest
    TX, the OK/TX Panhandles, and eventually into western OK this
    evening, while continuing to pose mainly a severe wind threat before
    eventually weakening.

    ...Mid Mississippi Valley into the Ohio Valley and New York...

    50-60 kt mid-level westerly flow will spread eastward across the
    Midwest/OH Valley into the central Appalachians through this evening
    as an upper-level trough moves eastward over the Great Lakes. A weak
    surface low should also develop eastward over the lower Great Lakes
    today, with a cold front advancing east-southeastward across the
    Midwest/OH Valley. Surface dewpoints generally range in the 50s to
    low 60s ahead of the front this morning. Coupled with poor mid lapse
    rates aloft and ongoing cloudiness, instability that develops by
    this afternoon may tend to remain somewhat limited. Even so, strong
    deep-layer shear associated with the mid-level jet will aid in
    updraft organization, with a mix of multicell clusters and possibly
    some marginal supercell structures developing this afternoon
    along/ahead of the front. Isolated severe hail and damaging winds
    both appear possible, and a tornado or two may also occur across
    parts of OH into western/central PA and western NY where slightly
    stronger low-level flow and related shear should exist. Confidence
    in stronger instability and a greater severe risk remains too low
    for higher hail/wind probabilities with this update.

    ...Utah into Wyoming and Montana...

    Similar to yesterday, fairly high-based showers and thunderstorms
    should develop this afternoon across the eastern Great Basin. With a
    well-mixed boundary layer forecast with daytime heating, the main
    threat with most of this activity should be isolated severe winds
    with outflow-dominant convection as it spreads from UT into WY this
    afternoon and evening. Some chance for occasional hail may also
    exist farther north in southeast ID, WY, and parts of MT, where
    cooler temperatures aloft, stronger mid-level flow/deep-layer shear,
    and pockets of greater instability should support more robust
    convection.

    ..Gleason/Jewell.. 06/25/2026

    $$
    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (618:250/10)