Mesoscale Discussion 1370
NWS Storm Prediction Center Norman OK
1250 AM CDT Wed Jul 28 2021
Areas affected...Portions of eastern IA...southwestern WI...and far northwestern IL
Concerning...Severe Thunderstorm Watch 397...
Valid 280550Z - 280645Z
The severe weather threat for Severe Thunderstorm Watch 397
SUMMARY...An isolated hail/wind threat should diminish over the next
hour or so. Downstream watch issuance is not expected.
DISCUSSION...Ongoing strong convection across parts of eastern IA
and southwestern WI may continue to pose an isolated threat for
marginally severe hail and strong/gusty winds in the short term,
given the presence of around 1500-2500 J/kg of MLCAPE and 35-40 kt
of deep-layer shear. However, this activity will soon move
south-southeastward into an environment characterized by less
instability and increasing convective inhibition. The low-level
inflow into these storms is also rather weak and veered to
northwesterly. Accordingly, a gradual decrease in storm coverage and
intensity is forecast over the next couple of hours. Severe
Thunderstorm Watch 397 will likely be allowed to expire at 07Z as
scheduled, and a downstream watch is not expected.
= = =
To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at email@example.com and ask to be removed from WX-STORM. ------------=_1627451468-2011-3550--