ACUS11 KWNS 112259
SWOMCD
SPC MCD 112259=20
MTZ000-WYZ000-120030-

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 https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!4NsWEvNncw1Y4ps9p576jXvTR4w1dt-4hukc-a8gDkHOtbXTVwz82fuwMVBOiVFZzoQJabQTX= eGvqhCSww8YQILVqzs$ for graphic product...

ATTN...WFO...UNR...BYZ...RIW...

LAT...LON 43321039 45650714 45130498 43810570 42180897 43321039=20

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


=3D =3D =3D
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