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Mesoscale Discussion 0650
NWS Storm Prediction Center Norman OK
0727 PM CDT Wed May 20 2020
Areas affected...Easern Montana
Concerning...Severe Thunderstorm Watch 197...
Valid 210027Z - 210200Z
The severe weather threat for Severe Thunderstorm Watch 197
SUMMARY...Severe threat should spread northeast across ww197.
DISCUSSION...Water-vapor imagery depicts a short-wave trough
ejecting northeast across WY toward eastern MT. Large-scale forcing
for ascent appears to be aiding broken squall line as it propagates
across the plains toward a corridor of modest instability over
eastern portions of ww197. With LLJ expected to increase across
western ND into southeast SK later this evening, this convection
should spread toward the international border into portions of
extreme western ND. Latest hail algorithm output continues to
suggest large hail is noted with supercell structures and this
should be the primary concern, though some wind is also possible.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 45000927 48910983 48920433 45010416 45000927
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