Mesoscale Discussion 1337
NWS Storm Prediction Center Norman OK
1033 PM CDT Fri Jul 23 2021
Areas affected...northeast South Dakota...southeast North
Concerning...Severe Thunderstorm Watch 388...
Valid 240333Z - 240530Z
The severe weather threat for Severe Thunderstorm Watch 388
SUMMARY...Severe gusts or marginally severe hail remains possible
with a cluster of cells moving the North/South Dakota border.
DISCUSSION...A primary cluster of storms continues east/southeast
near the ND/SD border, with new development on the southwest flank.
A 75 mph gust was recently measured in McPherson County SD. VWPs
across ND show increased northwest winds just above the surface,
indicating the deeper cold advection. This is aiding additional
storms on the northwest side of the primary cluster.
Temperatures aloft remain cool due east of the advancing convection,
and the boundary layer remains very moist and unstable. Height falls
with the upper trough will continue, favoring at least a continued
threat across the remainder of WW 388 and perhaps to the east. Parts
of west-central MN may need a watch should the storms continue to
produce severe gusts.
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