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| Mesoscale Discussion 1254 | |
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Mesoscale Discussion 1254 NWS Storm Prediction Center Norman OK 0559 PM CDT Wed Jun 11 2025 Areas affected...Parts of Wyoming into the Northern High Plains Concerning...Severe Thunderstorm Watch 409... Valid 112259Z - 120030Z The severe weather threat for Severe Thunderstorm Watch 409 continues. SUMMARY...Isolated severe thunderstorms will continue this evening. DISCUSSION...High-level diffluent flow is noted across the northern Rockies ahead of a pronounced short-wave trough. Water-vapor imagery supports this with large-scale ascent spreading across southern MT into western WY. Scattered thunderstorms have developed across this region and several robust supercells have generated large hail at times, along with some gusty winds. 500mb speed max will translate across northern WY later this evening, and this may encourage additional development along a surface boundary draped along the eastern slopes of the Big Horn Mountains. If so, strong storms may advance downstream a bit farther than currently indicated by ww0409. ..Darrow.. 06/11/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...UNR...BYZ...RIW... LAT...LON 43321039 45650714 45130498 43810570 42180897 43321039 MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH MOST PROBABLE PEAK WIND GUST...65-80 MPH MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN |
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