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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