Mesoscale Discussion 0478
NWS Storm Prediction Center Norman OK
0307 PM CDT Fri Apr 17 2026
Areas affected...northern Wisconsin
Concerning...Severe Thunderstorm Watch 128...
Valid 172007Z - 172100Z
The severe weather threat for Severe Thunderstorm Watch 128
continues.
SUMMARY...Severe threat continues with WW128.
DISCUSSION...Thunderstorm activity continues along the cold front
within WW128. A mixed mode of clusters and isolated supercells
continues. Hail around 1-1.5 inches in diameter has been reported.
The primary risk will be for large hail and damaging wind, given the
decreasing moisture with northward extent fairly marginal low-level
shear. However, a tornado cannot be ruled out, especially with any
more discrete supercell. Through time, as the front shifts eastward
the primary threat will shift to damaging wind.