Persistent drought conditions from late Fall in to early Winter continued for portions of Phillips and Valley Counties, while multiple winter storms through the latter half of December alleviated drought conditions for some locations.
Every event with a place to put it; 4 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GGW wrote it up.
Persistent drought conditions from late Fall in to early Winter continued for portions of Phillips and Valley Counties, while multiple winter storms through the latter half of December alleviated drought conditions for some locations.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Glasgow, MT wrote its last area forecast discussion before the first event at Nov 30, 3:21 PM MST, 8 hours 39 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Glasgow MT 321 PM MST Sun Nov 30 2025 .KEY MESSAGES... - Arctic air continues with a Cold Advisory across the Hi-Line through Monday morning for wind chills as low as 30 below zero. - More seasonable temperatures return by Tuesday. - Increasing chances for light snow Tuesday and Friday/Saturday. && .DISCUSSION... WEATHER PATTERN OVERVIEW: As Arctic high pressure exits to the east, lingering below zero temperatures tonight and winds increasing out of the west will keep a Cold Advisory for wind chills going for the Hi-Line. Low clouds and freezing fog has occurred much of the day downwind of Fort Peck Lake impacting Glasgow, which is likely to become more scattered and directed away from Glasgow with the wind shift around midnight. Tuesday brings a recovery in temperatures into the 20s and 30s, along with some light snow accumulations south of the Missouri River and Little Rockies as a system tracks mainly southwest of the area. An unsettled pattern will cause seasonable temperatures swings and light precipitation chances to remain through next weekend. FORECAST CONFIDENCE & DEVIATIONS: Blended winds with 90th percentile and short term models for frontal passage tonight into Monday. Confidence is high for significant warming in temperatures through Tuesday, while still low to moderate for potential precipitation type and amounts late in the week. -JEZ && .AVIATION... FLIGHT CATEGORY: Mainly VFR (scattered IFR fog-particularly KGGW) Extreme cold will be the main impact to TAF sites through the cycle with temperatures below zero tonight into Monday morning. Low clouds and fog coming off Fort Peck Lake will continue to produce IFR conditions over KGGW into this evening, with increasing potential for clearing after 04Z as winds switch toward the west. This will briefly move patches of this fog toward KOLF. && .GGW WATCHES/WARNINGS/ADVISORIES... Cold Weather Advisory until 10 AM MST Monday for Central and Southeast Phillips-Central and Southern Valley-Daniels-Eastern Roosevelt-Northern Phillips-Northern Valley-Sheridan-Western Roosevelt. && weather.gov/glasgow
The national radar mosaic for the moment the first event began.
4 drought. Local standard time, as filed.
D2 drought conditions continued for the first half of the month over all but the southeast half of the zone.
D2 and a sliver of D3 drought conditions here continued through December 29th.
D2 drought conditions continued through the first half of the month.
D2 drought conditions continued through the first half of the month over the western portion of the zone.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2025Every state in 2025This day in weather historyWarnings in Montana, December 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1296200, 1296201, 1296202, 1296203.