SPC MD 739

MD 0739 CONCERNING SEVERE THUNDERSTORM WATCH 208... FOR PORTIONS OF EXTREME SOUTHEAST ILLINOIS INTO FAR SOUTHWESTERN INDIANA Mesoscale Discussion 0739 NWS Storm Prediction Center Norman OK 0510 PM CDT Sat May 16 2026 Areas affected...portions of extreme southeast Illinois into far southwestern Indiana Concerning...Severe Thunderstorm Watch 208... Valid 162210Z - 162315Z The severe weather threat for Severe Thunderstorm Watch 208 continues. SUMMARY...A localized swath of damaging to severe gusts may occur over the next few hours, with peak gusts in the 65-75 mph range possible. DISCUSSION...Transient supercells have recently shown upscale growth trends, leading to MCS development, with multiple 60+ mph estimated gusts noted over the past hour. Ahead of this MCS resides a convective outflow boundary left behind by previous multicells. Should the MCS further organize, it is likely that the MCS would traverse this boundary, ingesting localized vorticity and potentially developing mesovortices. If this scenario occurs, a focused swath of strong to severe gusts may occur, with gusts peaking in the 65-75 mph range. ..Squitieri.. 05/16/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LMK...IND...PAH...ILX...LSX... LAT...LON 38888856 38678748 38468655 38358641 38228634 38118639 38058655 37978686 37978710 38058766 38118821 38208860 38288884 38888856 MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH MOST PROBABLE PEAK WIND GUST...65-80 MPH MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN Read more