Winter Storm Warning Chinook, Montana

Winter alerts in Chinook, newest first, in effect or ended
Alert	State	Severity	Places
Winter Weather AdvisoryEnded Snow. Issued October 9 Ended October 12, 2026	Montana	Moderate	57 places Chinook Havre Shelby Cut Bank Fort Belknap Agency Hays Chester Harlem Havre North Valier and 47 more
Winter Weather AdvisoryEnded 3 to 6 inches of snow, gusts up to 40 mph. Issued March 8 Ended March 9, 2026	Montana	Moderate	146 places Chinook Great Falls Havre Lewistown Malmstrom AFB Shelby Cut Bank North Browning Conrad South Browning and 136 more
Winter Weather AdvisoryEnded 2 to 6 inches of snow below 7000 feet and up to 10 inches above 7000 feet with locally higher amounts possible along the peaks, gusts up to 65 mph. Issued February 26 Ended February 28, 2026	Montana	Moderate	36 places Chinook Lewistown Fort Belknap Agency Hays Harlem Rocky Boy's Agency Parker School Boneau St. Pierre Lewistown Heights and 26 more
Cold Weather AdvisoryEnded Gusts up to 60 mph, wind chills as low as 30 below zero. Issued February 17 Ended February 19, 2026	Montana	Moderate	153 places Chinook Great Falls Havre Helena Valley West Central Lewistown Malmstrom AFB Shelby Cut Bank North Browning Conrad and 143 more
Winter Storm WarningEnded 1 to 3 inches of snow, gusts up to 60 mph. Issued February 16 Ended February 17, 2026	Montana	Severe	9 places Chinook Fort Belknap Agency Harlem Turner Colony Turner Zurich North Harlem Colony Hogeland Hartland Colony
Winter Weather AdvisoryEnded 2 to 6 inches of snow, with up to 10 inches at mountain peaks. Issued February 15 Ended February 17, 2026	Montana	Moderate	146 places Chinook Great Falls Havre Helena Valley West Central Malmstrom AFB Big Sky Shelby Cut Bank Montana City North Browning and 136 more
Cold Weather AdvisoryEnded Wind chills as low as 35 below zero. Issued January 21 Ended January 23, 2026	Montana	Moderate	33 places Chinook Havre Fort Belknap Agency Hays Harlem Havre North Rocky Boy's Agency Parker School Boneau St. Pierre and 23 more
Extreme Cold WatchEnded Wind chills as low as 40 below zero. Issued January 21 Ended January 21, 2026	Montana	Severe	33 places Chinook Havre Fort Belknap Agency Hays Harlem Havre North Rocky Boy's Agency Parker School Boneau St. Pierre and 23 more
Winter Weather AdvisoryEnded Around a light glaze of ice. Issued December 24 Ended December 25, 2025	Montana	Moderate	88 places Chinook Great Falls Havre Malmstrom AFB Shelby Conrad Choteau Sun Prairie Fort Belknap Agency Fort Benton and 78 more
Winter Storm WatchEnded Up to a tenth of an inch of ice. Issued December 24 Ended December 24, 2025	Montana	Severe	88 places Chinook Great Falls Havre Malmstrom AFB Shelby Conrad Choteau Sun Prairie Fort Belknap Agency Fort Benton and 78 more
Winter Weather AdvisoryEnded Around a light glaze of ice. Issued December 23 Ended December 24, 2025	Montana	Moderate	33 places Chinook Havre Shelby Fort Belknap Agency Chester Harlem Havre North Beaver Creek West Havre Rudyard and 23 more
Winter Weather AdvisoryEnded 1 to 4 inches of snow over the valleys and 4 to 10 inches at and above pass level, up to a glaze of ice, gusts up to 40 mph. Issued December 21 Ended December 22, 2025	Montana	Moderate	109 places Chinook Bozeman Helena Belgrade Havre Helena Valley Southeast Four Corners Helena Valley Northwest Dillon Helena Valley Northeast and 99 more
Winter Weather AdvisoryEnded Up to 6 inches of snow, gusts up to 75 mph. Issued December 16 Ended December 17, 2025	Montana	Moderate	63 places Chinook Havre Lewistown Big Sky Fort Belknap Agency West Yellowstone Hays Harlem Havre North Rocky Boy's Agency and 53 more
Cold Weather AdvisoryEnded Wind chills as low as 30 below zero. Issued December 12 Ended December 13, 2025	Montana	Moderate	9 places Chinook Fort Belknap Agency Harlem Turner Colony Turner Zurich North Harlem Colony Hogeland Hartland Colony
Cold Weather AdvisoryEnded Wind chills as low as 28 below zero. Issued December 11 Ended December 12, 2025	Montana	Moderate	49 places Chinook Havre Shelby Cut Bank Fort Belknap Agency Chester Harlem Havre North Valier Sunburst and 39 more
Winter Storm WarningEnded 6 to 12 inches of snow. Issued December 11 Ended December 13, 2025	Montana	Severe	83 places Chinook Havre Lewistown Shelby Fort Belknap Agency Fort Benton Rocky Boy West Hays Chester Harlem and 73 more
Winter Storm WatchEnded 2 to 4 inches of snow on Marias Pass, and up to 7 inches at ridge tops, 7 to 12 inches of snow possible along Marias Pass, with over a foot of snow at the higher peaks. Issued December 9 Ended December 13, 2025	Montana	Severe	146 places Chinook Great Falls Havre Lewistown Malmstrom AFB Shelby Cut Bank North Browning Conrad South Browning and 136 more
Winter Weather AdvisoryEnded 2 to 4 inches of snow on Marias Pass, and up to 7 inches at ridge tops. Issued December 9 Ended December 10, 2025	Montana	Moderate	161 places Chinook Great Falls Helena Havre Helena Valley Southeast Helena Valley West Central Lewistown Helena Valley Northwest Malmstrom AFB Helena Valley Northeast and 151 more
Cold Weather AdvisoryEnded Very cold wind chills of 25 to 35 below zero expected. Issued November 29 Ended December 1, 2025	Montana	Moderate	25 places Chinook Havre Fort Belknap Agency Harlem Havre North Beaver Creek West Havre Rudyard Saddle Butte Gildford and 15 more
Winter Storm WarningEnded 5 to 9 inches of snow possible. Issued November 26 Ended November 29, 2025	Montana	Severe	88 places Chinook Great Falls Havre Malmstrom AFB Shelby Conrad Choteau Sun Prairie Fort Belknap Agency Fort Benton and 78 more