SPC MD 863

SPC MD 863

MD 0863 CONCERNING SEVERE THUNDERSTORM WATCH 272… FOR NORTHERN IOWA AND SOUTHERN MINNESOTA

Mesoscale Discussion 0863
NWS Storm Prediction Center Norman OK
1134 PM CDT Mon May 20 2024

Areas affected…northern Iowa and southern Minnesota

Concerning…Severe Thunderstorm Watch 272…

Valid 210434Z – 210600Z

The severe weather threat for Severe Thunderstorm Watch 272
continues.

SUMMARY…A new severe weather watch does not appear needed, but WW
272 could be locally extended in time for an hour or two.
Thunderstorms are expected to remain rather disorganized with
diminishing intensities into the overnight hours.

DISCUSSION…Ongoing storms are generally embedded with rather
modest southwesterly deep-layer mean flow on the order of 20 kt or a
bit less. But, due to pronounced veering of wind fields with
height, vertical shear may be contributing to the maintenance of
vigorous convection. Even as low-level warm advection maintains
lift into the overnight hours, it does appear, though, that the risk
for severe hail and wind will begin to wane with further
boundary-layer cooling.

..Kerr.. 05/21/2024

…Please see www.spc.noaa.gov for graphic product…

ATTN…WFO…ARX…MPX…DMX…FSD…

LAT…LON 42889602 43359555 44169324 44159209 43359195 42889250
42259460 42159550 42889602

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