FXUS65 KGGW 271121

AFDGGW



Area Forecast Discussion

National Weather Service Glasgow MT

521 AM MDT Mon Oct 27 2025



.DISCUSSION...

KEY MESSAGES:



- Seasonably cool temperatures with breezy conditions are expected

  through most of the week. 



- A few showers are possible with a weak frontal passage 

  Wednesday night.



WEATHER PATTERN OVERVIEW:



Stacked low over the Canadian prairies will be slow to move

eastward with a blocking high over eastern Canada. Through midweek

the trough extending south across the plains will stretch and

under cut the Canadian high and allow high pressure to build into

the western states. 



A Pacific shortwave moving through the Pacific Northwest will

slide along the Canadian border and push a weak front across

eastern Montana on Wednesday night. Not a lot of moisture with 

the system, but a few showers are possible, mainly in the 

northeast corner of the state. 



Ridge rebounds behind the shortwave into the weekend with

potential for a much stronger system moving through the region

over the weekend. 



FORECAST CONFIDENCE & DEVIATIONS:



Better consensus developing regarding the forecast through

Thursday. Confidence for the end of the week is still low with

differences in timing of features.



&&



.AVIATION...

VFR. Clouds will increasing again today. Occasional rain is

possible mainly east of the Yellowstone River. Partial clear will

occur tonight.



&&



.GGW WATCHES/WARNINGS/ADVISORIES...

None.

&&



$$



weather.gov/glasgow