389 FXUS65 KGGW 062047 AFDGGWArea Forecast Discussion National Weather Service Glasgow MT 247 PM MDT Sat Sep 6 2025
.DISCUSSION...
KEY MESSAGES:
- A warm ridge of high pressure brings a return to summer-like conditions by early next week.
- Daily chances for showers and thunderstorms return to our region by the middle of next week.
WEATHER PATTERN OVERVIEW:
Following areas of early season frost this morning over far NE Montana, a warm upper level ridge of high pressure over the Pacific NW is drifting eastward into Montana now through early next week. This will allow for mainly clear and sunny skies, low humidity, and high temperatures rebounding to as warm as the upper 80s from Sunday into midweek.
The next low pressure system will push into the Pacific NW and orient some SW flow aloft approaching NE Montana as early as Tuesday evening. This will direct more Pacific moisture and some instability into our region and set the stage for a return to scattered thunderstorms later next week. At this time, model data is unclear regarding placement and timing of these storms. Those details will become more clear by mid-week.
FORECAST CONFIDENCE & DEVIATIONS:
Stayed close to the base forecast besides adding some detail to short term winds and temperatures. There is high confidence in the forecast through Tuesday, then more average confidence thereafter for the extent of rain chances.
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.AVIATION...
UPDATED: 2046Z, 9/6
FLIGHT CATEGORY: VFR
DISCUSSION: No concerns. An approaching ridge of high pressure will provide mainly clear skies today, followed by increasing high level clouds tomorrow. Winds will remain either light and variable or calm.
EQUIPMENT: KSDY AWOS broadcast system is currently out for METARS and amendments will not be scheduled. (AMD NOT SKED)
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.GGW WATCHES/WARNINGS/ADVISORIES... None. &&
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NWS GGW Office Area Forecast Discussion