Area Forecast Discussion
Issued by NWS Glasgow, MT
Issued by NWS Glasgow, MT
110 FXUS65 KGGW 250930 AFDGGW Area Forecast Discussion National Weather Service Glasgow MT 230 AM MST Tue Nov 25 2025 .DISCUSSION... KEY MESSAGES: - Wintry travel impacts likely for Thanksgiving holiday travelers beginning Thursday afternoon. - Stable but cool temps will drop another 10 degrees behind the Thursday`s front passage lasting into the weekend. WEATHER PATTERN OVERVIEW: Tuesday: The system will exit Montana fully by the afternoon hours. Some lingering light snowfall across the Big Sheep Mountains east into North Dakota is possible into the late morning hours. Tuesday afternoon will be cold with highs below freezing for most locations. Sun should appear for most locations by the afternoon before more clouds move in tonight. Mostly dry and cooler conditions are then expected through Thursday morning. Thursday afternoon through Friday, northwest flow aloft will pull a short wave down with it. This in turn will form a low pressure system over southern Alberta and drag it in through Montana along with another newly developed Arctic frontal push. The bulk of the snow`s track looks to be through north central to southeast Montana with this frontal passage, but that should still be able to affect the southwestern half of the GGW CWA with the track still having range to slide northeast or southwest several counties within future forecasts which reduced confidence. Temps will drop an additional 10 degree behind the cold front and stay that way through at least the Weekend along with lingering chance for isolated to scattered snow showers through Sunday. FORECAST CONFIDENCE & DEVIATIONS: One deviation to NBM in the first 9-12 hours of the hourly Sky grids in order to place OVC skies where NBM claims BKN for future TAFs. Otherwise no deviations observed. HIGH confidence in temperatures dropping off behind a front THursday night lasting into the weekend. MODERATE confidence in a snow storm somewhere along the front. LOW confidence in placement of the storm`s track with it expected to shift northeast or southwest over the next several forecast cycles. && .AVIATION... LAST UPDATE: 0815Z 24HR FLIGHT CAT RANGE: IFR to VFR DISCUSSION: IFR ceilings will rise and exit west to east starting early this morning and should clear totally by about 18-20Z. Remaining MVFR ceilings should clear within a couple hours of that. Remaining snow showers this morning will exit all terminals earlier around 12Z. SKC to SCT skies are expected for the afternoon hours, but mid to high clouds will fill back in tonight. WIND: NW to N at 10 to 15 kts this morning. Backing to W to NW and decreasing to less than 10 kts this afternoon. Becoming light and variable overnight. EQUIPMENT: KOLF`s ASOS data is not making it out to the Internet due to FAA`s telecomm circuit being down and also can not be phone dialed either. KOLF TAF will remain AMD NOT SKED until repairs can be made by FAA and observations restored. GAH && .GGW WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory until 5 AM MST early this morning for Central and Southeast Phillips-Central and Southern Valley- Daniels-Dawson-Eastern Roosevelt-McCone-Northern Phillips- Northern Valley-Richland-Sheridan-Southwest Phillips-Western Roosevelt-Wibaux. && $$ weather.gov/glasgow