SPC AC 121232

   Day 1 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0732 AM CDT Sat Apr 12 2025

   Valid 121300Z - 131200Z

   ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS THIS
   AFTERNOON/EVENING ACROSS NORTHERN WY...SOUTHEASTERN MT AND EXTREME
   WESTERN SD...

   ...SUMMARY...
   Thunderstorms with isolated severe gusts are possible from the Big
   Horns and southeast Montana to the Black Hills this afternoon into
   the evening.

   ...Northern WY/southeastern MT/western SD this afternoon/evening...
   A midlevel shortwave trough over WA/OR this morning will progress
   eastward over ID/MT/WY by tonight, with downstream lee cyclogenesis
   into the central Plains.  Low-level moisture will remain limited
   across the northern Rockies and adjacent High Plains, but forcing
   for ascent and midlevel moisture should be sufficient for some
   high-based convection this afternoon/evening across northern WY and
   southern MT.  Inverted-V profiles with weak buoyancy and some
   increase in midlevel flow could result in isolated outflow gusts of
   50-65 mph.

   ..Thompson/Dean.. 04/12/2025

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   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z