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 >

Current conditions at

ROCKY BOY (RCBM8)

Lat: 48.25529°NLon: 109.78592°WElev: 3789.0ft.

-5°F

-21°C

Humidity	67%
Wind Speed	WNW 5 MPH
Barometer	NA
Dewpoint	-13°F (-25°C)
Visibility	NA
Wind Chill	-16°F (-27°C)
Last update	28 Dec 12:18 AM MST

More Information:

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

Extended Forecast for

Big Sandy MT

Overnight
Low: -13 °F
Mostly Clear
Sunday
High: 10 °F
Sunny
Sunday Night
Low: 7 °F⇑
Mostly Clear
Monday
High: 20 °F
Mostly Sunny
Monday Night
Low: 20 °F
Mostly Cloudy
Tuesday
High: 40 °F
Partly Sunny
Tuesday Night
Low: 24 °F
Mostly Cloudy
Wednesday
High: 38 °F
Partly Sunny
Wednesday Night
Low: 20 °F
Mostly Cloudy

Detailed Forecast

Overnight

Mostly clear, with a low around -13. Wind chill values as low as -25. West northwest wind 5 to 8 mph.

Sunday

Sunny, with a high near 10. Wind chill values as low as -10. Light and variable wind becoming south around 6 mph in the afternoon.

Sunday Night

Mostly clear, with a temperature falling to near 7 by 11pm, then rising to around 13 during the remainder of the night. Wind chill values as low as zero. South wind around 7 mph.

Monday

Mostly sunny, with a high near 20. South southwest wind around 7 mph.

Monday Night

Mostly cloudy, with a low around 20. Southwest wind around 5 mph.

Tuesday

Partly sunny, with a high near 40. South southwest wind 3 to 5 mph.

Tuesday Night

Mostly cloudy, with a low around 24. West southwest wind around 5 mph.

Wednesday

Partly sunny, with a high near 38. West northwest wind around 6 mph.

Wednesday Night

Mostly cloudy, with a low around 20.