Mesoscale Discussion 1335
NWS Storm Prediction Center Norman OK
0744 PM CDT Fri Jul 23 2021
Areas affected...northern Minnesota
Concerning...Severe Thunderstorm Watch 387...
Valid 240044Z - 240245Z
The severe weather threat for Severe Thunderstorm Watch 387
SUMMARY...A few reports of severe hail and wind remain possible into
the Arrowhead of Minnesota.
DISCUSSION...Strong to severe cells currently extend from Cass
County to Lake County MN, the latter being the largest storm with a
relatively fast southeastward motion and possible wind threat. Other
cells to the west may contain marginally severe hail.
Southwesterly low-level winds of 25kt as seen on 00Z MPX sounding
will maintain theta-e advection ahead of these storms, and further
congealing of convection is possible. Storms may persist for several
hours given further height falls this evening. Although CIN will
gradually increase with time, new development along outflows or
southwestern flanks of the existing storms is possible in the near
term as the air mass remains relatively uncapped.
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