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Mesoscale Discussion 863 | |
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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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