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