FXUS65 KMSO 211003

AFDMSO



Area Forecast Discussion

National Weather Service Missoula MT

403 AM MDT Sun Jun 21 2026



.DISCUSSION...



KEY MESSAGES:



-  Showers and thunderstorms along the Divide this afternoon.



-  Warming trend Tuesday through Thursday



-  Cooler and showery conditions expected next weekend





A low pressure system over Alberta will cause isolated and

scattered showers and thunderstorms today along the Continental

Divide, especially around Glacier National Park. This low will be

slowly moving off to the east, so the latest guidance is

indicating another round of convection over the same area on

Monday afternoon and evening. 



Then a ridge of high pressure will be building over the region

Tuesday through Thursday. This ridge will bring a warming and

drying trend over the Northern Rockies for a few days.

Temperatures will well above seasonal averages by Thursday as

readings will be in the upper 80s to low 90s for most valley

locations and triple digits for the Riggins area. 



The long term models are showing a large low pressure system

moving into the Pacific Northwest by next weekend causing

significant cooling with widespread precipitation. Temperatures by

Saturday are anticipated to be around 10 degrees below seasonal

normals.





&&



.AVIATION...A low pressure system over Alberta will cause mid to

high levels clouds to stream over northwest Montana along with

scattered showers and thunderstorms, especially near the

Continental Divide. KGPI has the best potential for nearby showers

this afternoon and evening. 



&&



.MSO WATCHES/WARNINGS/ADVISORIES...

MT...None.

ID...None.

&&



$$