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| Mesoscale Discussion 878 | |
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Mesoscale Discussion 0878 NWS Storm Prediction Center Norman OK 0503 PM CDT Tue May 21 2024 Areas affected...Central Iowa and far southeastern Minnesota Concerning...Tornado Watch 277... Valid 212203Z - 212330Z The severe weather threat for Tornado Watch 277 continues. SUMMARY...Long tracked supercells within a line extending north to south across central IA will continue to move eastward into an even more favorable tornadic environment. DISCUSSION...Ongoing tornadic supercells continue from Cambridge, to just east of Des Moines. The latest DMX VAD profile data indicates 0-1 km SRH around 100 m2/s2. However, just upstream the DVN VAD shows SRH is double to triple that. In addition, a corridor of higher boundary layer moisture and backed surface flow east of the current line of deep moist convection from around Olmsted County south-southeastward to Linn County suggests localized SRH should be maximized there, juxtaposed with maximum buoyancy. Therefore, the potential for long tracked, damaging tornadoes appears most likely over the next 1-2 hours as far north as extreme southeastern MN. ..Barnes.. 05/21/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DVN...ARX...MPX...DMX... LAT...LON 40659371 41099392 42139384 42969359 43329321 44129282 44109237 43739184 43349151 42809142 42109155 41769160 41149196 40749235 40599255 40659371 |
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