MD 0926 CONCERNING SEVERE THUNDERSTORM WATCH 299…300… FOR IOWA/NORTHERN MISSOURI
Mesoscale Discussion 0926
NWS Storm Prediction Center Norman OK
0517 AM CDT Fri May 24 2024
Areas affected…Iowa/northern Missouri
Concerning…Severe Thunderstorm Watch 299…300…
Valid 241017Z – 241215Z
The severe weather threat for Severe Thunderstorm Watch 299, 300
continues.
SUMMARY…Severe-weather risk — including damaging winds, hail, and
a tornado or two — continues across WW 300. Greatest risk is
evident across central and southern Iowa — near and south of the
surface warm front.
DISCUSSION…Latest radar loop shows the well-established/organized
convective line moving eastward across Iowa, and now merging (in
central IA) with cellular convection which had developed east of the
main line. A particularly interesting interaction has recently
occurred south/southeast of Des Moines, where rapid upscale
supercellular evolution was observed within a bowing segment of the
line, subsequent to merger of the bow with one of these more
isolated convective elements. Radar data from KDMX appeared to
confirm a brief tornado.
Elsewhere, damaging winds, and occasional/brief tornadic spin-ups
remain possible. Risk appears to wane with northward extent toward
the Minnesota border, especially into northeastern Iowa where a much
cooler/more stable airmass exists to the northeast of the
central/southeastern Iowa warm front. South of that front however,
severe weather remains likely as convection continues advancing
eastward over the next couple of hours.
..Goss.. 05/24/2024
…Please see www.spc.noaa.gov for graphic product…
ATTN…WFO…LSX…DVN…ARX…DMX…EAX…
LAT…LON 39709477 40339493 41149357 42079404 43019429 42999326
42899216 42459093 41009093 40039148 39709477
