Mesoscale Discussion 1245 NWS Storm Prediction Center Norman OK 1121 PM CDT Sun Jun 21 2026 Areas affected...far southern Indiana into portions of northern Kentucky Concerning...Tornado Watch 365...370... Valid 220421Z - 220615Z The severe weather threat for Tornado Watch 365, 370 continues. SUMMARY...A trio of supercell thunderstorms continue to move east across the area. The overall environment will support a continued severe threat, including tornadoes, in the near term, with a gradual decrease in tornado potential as they storms move east into an increasingly unfavorable environment. DISCUSSION...A trio of supercells continue across the region, including one supercell with a confirmed tornado near Boonville, IN, around 1044 PM CDT. This tornado occurred with the western most supercell in an environment with MLCAPE around 1500 J/kg and 0-3 km SRH around 450 m2/s2 (per KVXW VAD). These supercells will move east through the night on the southern periphery of a remnant MCV moving across Indiana into Ohio. As they moves east, they should move into an increasingly stable atmosphere owing to widespread stratiform rain from earlier convection (objectively analyzed MLCAPE falls to less than 250 J/kg across eastern portions of northern Kentucky). Thus, given the ongoing supercells, the tornado threat will continue in the near term, especially across portions of southwest Indiana along and adjacent portions of northern Kentucky. Isolated large hail to around 1" may be possible, along with gusty thunderstorm winds. However, as the supercells move farther east and into a more stable environment, the overall tornado/severe threat should diminish with time. ..Marsh.. 06/22/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...JKL...LMK...PAH... LAT...LON 37888798 38218745 38328612 38268506 38228442 38078404 37848399 37708519 37648637 37718731 37888798 MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN
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