The center of a strong arctic high pressure moved through the Canadian prairies generating extreme cold conditions across northeast Montana with the combination of winds and frigid temperatures.

Extreme Cold/Wind Chill in RICHLAND, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dangerous wind chills continued into the morning of Feb 1st. The Sidney ASOS reported wind chills of -40F or colder with the lowest reading at -48F at 0500 MST.

Extreme Cold/Wind Chill in DAWSON, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dangerous wind chills continued into the morning of Feb 1st. The Glendive AWOS and Lindsay Divide reported wind chills of -40F or colder. The Glendive AWOS reported the coldest wind chill of -47F at 0400 MST.

Extreme Cold/Wind Chill in WIBAUX, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Dangerous wind chills continued into the morning of Feb 1st. The Beaver Hill DOT sensor reported wind chills of -40F or colder.

Extreme Cold/Wind Chill in NORTHERN PHILLIPS, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Dangerous wind chills continued into the morning of Feb 1st.

Extreme Cold/Wind Chill in NORTHERN VALLEY, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Dangerous wind chills continued into the morning of Feb 1st. At 0500 MST, 10 miles south of Opheim an estimated wind chill of -59F was recorded.

Extreme Cold/Wind Chill in SHERIDAN, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Dangerous wind chills continued into the morning of Feb 1st. At 0645 MST, Plentywood handar had windchills below -40F.

Extreme Cold/Wind Chill in CENTRAL AND SOUTHERN VALLEY, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Dangerous wind chills continued into the morning of Feb 1st. At 0400 February 1st, wind chill readings at the Glasgow Airport reached -58F. At 0500 MST, a -62F wind chill was reported in Nashua.

Extreme Cold/Wind Chill in WESTERN ROOSEVELT, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dangerous wind chills continued into the morning of Feb 1st. At 0600 MST Wolf Point ASOS reported a wind chill of -56F.

Extreme Cold/Wind Chill in EASTERN ROOSEVELT, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Dangerous wind chills continued into the morning of Feb 1st. The Polar RAWS and the Stateline had wind chill readings of -40F or more.

Extreme Cold/Wind Chill in DANIELS, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Dangerous wind chills continued into the morning of Feb 1st. Estimated wind chills from observations at Coronach, Saskatchewan.

Extreme Cold/Wind Chill in GARFIELD, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dangerous wind chills continued into the morning of Feb 1st. At midnight MST at the Jordan ASOS, several hours of -40F or colder wind chills have occurred. At 0300 MST at the Jordan ASOS, the wind chill was -52F. At 0300 MST at the Hillside DOT sensor, the wind chill reached -40F.

Extreme Cold/Wind Chill in MCCONE, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Dangerous wind chills continued into the morning of Feb 1st. The Fort Peck handar and the Cow Creek DOT sensors continued to report wind chills of -40F or colder.

Extreme Cold/Wind Chill in PRAIRIE, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Dangerous wind chills continued into the morning of Feb 1st. The observation sites at Fallon and at the Big Sheep RAWS recorded wind chills of -40F or colder.

Extreme Cold/Wind Chill in CENTRAL AND SE PHILLIPS, MONTANA
From 01-FEB-11 00:00:00 to 01-FEB-11 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Dangerous wind chills continued into the morning of Feb 1st. At 0300 MST, Cooperative weather observer reported in Malta reported wind chill of -42F.