An arctic air mass combined with effective winds mixing down from the mid-layers of the atmosphere to produced dangerously cold wind chills across portions of northeast Montana.

Cold/Wind Chill in WESTERN ROOSEVELT, MONTANA
From 01-MAR-14 00:00:00 to 01-MAR-14 11:05:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

While many locations in this zone recorded only marginal and sporadic wind chills of -40 or worse, they were more prevalent and steady at the McDonalds MT-13 DOT site, beginning at 8:25 PM on February 28th and ending at 11:05 AM on March 1st.  The coldest wind chill of -51 occurred between 5:40 AM and 5:55 AM.

Cold/Wind Chill in EASTERN ROOSEVELT, MONTANA
From 01-MAR-14 00:00:00 to 01-MAR-14 10:25:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Although wind chills of -40 or worse began at 11:05 PM on February 28th, they did not last for an hour or more until just after midnight on the morning of March 1st. Wind chills improved to warmer than -40 at 10:25 AM on March 1st.  The coldest wind chill of -50 occurred between 3:50 AM and 6:50 AM on March 1st.

Cold/Wind Chill in DAWSON, MONTANA
From 01-MAR-14 00:30:00 to 01-MAR-14 10:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Steady wind chills of -40 or worse across the zone began as early as 12:30 AM on the 1st and ended as late as 10:30 AM on the 1st.  The coldest wind chill of -48 was recorded at the Lindsay Divide MT-200S DOT site between 6:35 AM and 6:45 AM on March 1st.

Cold/Wind Chill in SHERIDAN, MONTANA
From 01-MAR-14 00:00:00 to 02-MAR-14 08:05:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Wind chills of -40 or worse occurring at least every hour began as early as 5:23 PM on February 28th at the Comertown Turn-Off MT-5 DOT site and continued through morning hours of March 1st.  After a break during the day, these dangerous wind chills returned on the evening of March 1st and continued through the early morning hours of March 2nd, ending at 8:05 AM.  The coldest wind chill of -53 occurred many times during the early morning hours on March 1st.

Cold/Wind Chill in MCCONE, MONTANA
From 01-MAR-14 06:45:00 to 01-MAR-14 08:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chills of -40 or worse were marginal and sporadic across most of this zone, but they did persist for more than one hour at the mesonet site east of Fort Peck Dam from 6:45 AM to 8:00 AM on March 1st.  The coldest wind chill of -43 was isolated and recorded at 3:50 AM on the 1st.

Cold/Wind Chill in DANIELS, MONTANA
From 01-MAR-14 00:00:00 to 02-MAR-14 07:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Steady wind chills of -40 or worse at the Navajo MT-5 DOT site began at 8:36 PM on February 28th, continued through the morning hours of March 1st, and after a break during the day on March 1st, resumed again that evening and finally ended at 7:00 AM on March 2nd.  The coldest wind chill of -53 occurred a few times in the 6:00 AM hour on March 1st.

Cold/Wind Chill in LITTLE ROCKY MOUNTAINS, MONTANA
From 01-MAR-14 06:05:00 to 01-MAR-14 07:35:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Persistent wind chills of -40 or worse on March 1st began at 6:05 AM at the Malta South US-191 DOT site and ended at 7:35 AM.  The coldest wind chill of -43 occurred between 6:40 AM and 7:00 AM.

Cold/Wind Chill in CENTRAL AND SOUTHERN VALLEY, MONTANA
From 01-MAR-14 00:00:00 to 01-MAR-14 09:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chills of -40 or worse were marginal and sporadic for many locations across this zone, but began with persistence as early as 10:00 PM on February 28th at the Saint Marie mesonet site and ended at 9:30 AM on March 1st.  The coldest wind chill of -46 was recorded at the Glasgow Airport ASOS 4:53 AM on March 1st.