Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Hazardous Weather Conditions

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

Lat: 48.74111°NLon: 113.43306°WElev: 4550.0ft.

-3°F

-19°C

Humidity	71%
Wind Speed	NA 3 MPH
Barometer	NA
Dewpoint	-10°F (-23°C)
Visibility	NA
Last update	27 Dec 10:10 AM MST

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

5 Miles WSW St Mary MT

Cold Weather Advisory until December 28, 05:00am

Winter Weather Advisory December 27, 12:04pm until December 27, 02:00pm

Click here for hazard details and duration

Cold Weather Advisory

...

Cold Weather Advisory until December 28, 05:00am
Winter Weather Advisory December 27, 12:04pm until December 27, 02:00pm
NOW: Multiple hazards in effect
Click HERE for Details
This Afternoon
High: -9 °F
Chance Snow
Tonight
Low: -11 °F⇑
Mostly Clear
Sunday
High: 13 °F
Mostly Sunny
and Breezy
Sunday Night
Low: 10 °F
Partly Cloudy
and Windy
Monday
High: 17 °F
Partly Sunny
and Windy
Monday Night
Low: 16 °F
Mostly Cloudy
and Breezy
Tuesday
High: 25 °F
Partly Sunny
and Breezy
Tuesday Night
Low: 22 °F
Mostly Cloudy

Detailed Forecast

This Afternoon

A 30 percent chance of snow, mainly before 2pm. Mostly cloudy, then gradually becoming sunny and cold, with a steady temperature around -9. Wind chill values as low as -30. North wind 8 to 15 mph, with gusts as high as 22 mph. Total daytime snow accumulation of 1 to 2 inches possible.

Tonight

Mostly clear, with a temperature falling to near -11 by 8pm, then rising to around -1 during the remainder of the night. Wind chill values as low as -25. West wind 6 to 11 mph increasing to 13 to 18 mph after midnight. Winds could gust as high as 25 mph.

Sunday

Mostly sunny, with a high near 13. Wind chill values as low as -30. Breezy, with a west wind 21 to 25 mph, with gusts as high as 39 mph.

Sunday Night

Partly cloudy, with a low around 10. Wind chill values as low as -10. Windy, with a west southwest wind 26 to 31 mph, with gusts as high as 44 mph.

Monday

Partly sunny, with a high near 17. Windy, with a west southwest wind 23 to 31 mph, with gusts as high as 45 mph.

Monday Night

Mostly cloudy, with a low around 16. Breezy, with a west southwest wind 23 to 25 mph, with gusts as high as 40 mph.

Tuesday

Partly sunny, with a high near 25. Breezy, with a west southwest wind around 23 mph, with gusts as high as 36 mph.

Tuesday Night

Mostly cloudy, with a low around 22. West southwest wind around 21 mph, with gusts as high as 32 mph.