Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Hazardous Weather Conditions

Current conditions at

BIG SHEEP MOUNTAIN (LCFM8)

Lat: 47.02819°NLon: 105.80472°WElev: 3172.0ft.

31°F

-1°C

Humidity	95%
Wind Speed	NNW 11 MPH
Barometer	NA
Dewpoint	30°F (-1°C)
Visibility	NA
Wind Chill	22°F (-6°C)
Last update	10 Dec 12:08 AM MST

More Information:

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

Extended Forecast for

10 Miles NW Rock Springs MT

Winter Storm Watch December 11, 08:00pm until December 13, 11:00am

Winter Weather Advisory December 10, 04:00am until December 11, 08:00pm

Click here for hazard details and duration

Winter Storm Watch

Winter Weather Advisory

Overnight
Low: 24 °F
Increasing
Clouds
Wednesday
High: 39 °F
Snow Likely
then
Rain/Snow and
Areas Fog
Wednesday Night
Low: 33 °F
Rain Likely
and Patchy
Fog
Thursday
High: 44 °F
Rain/Snow
Likely and
Patchy Fog
Thursday Night
Low: 1 °F
Chance Snow
and Patchy
Freezing Fog
Friday
High: 6 °F
Snow
Friday Night
Low: -8 °F
Heavy Snow
Saturday
High: 5 °F
Chance Snow
Saturday Night
Low: -7 °F
Mostly Cloudy

Detailed Forecast

Overnight

Increasing clouds, with a low around 24. West wind 6 to 9 mph.

Wednesday

Snow before 2pm, then rain and snow between 2pm and 3pm, then rain likely after 3pm. Areas of fog after 3pm. High near 39. South southeast wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.

Wednesday Night

Rain likely, mainly after 11pm. Patchy fog before 7pm. Otherwise, cloudy, with a low around 33. West wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

Thursday

Rain likely before 3pm, then rain likely, possibly mixed with snow between 3pm and 4pm, then snow likely after 4pm. Patchy fog before 4pm. Otherwise, cloudy, with a high near 44. West northwest wind 11 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

Thursday Night

A 50 percent chance of snow. Patchy freezing fog before 11pm. Cloudy, with a low around 1. North wind 14 to 18 mph, with gusts as high as 30 mph. New snow accumulation of less than a half inch possible.

Friday

Snow, mainly after 11am. High near 6. Northeast wind 7 to 11 mph. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.

Friday Night

Snow. The snow could be heavy at times. Low around -8. East wind 7 to 10 mph. Chance of precipitation is 90%. New snow accumulation of 5 to 9 inches possible.

Saturday

A 30 percent chance of snow, mainly before 11am. Mostly cloudy, with a high near 5. North northeast wind 7 to 10 mph becoming southwest in the morning.

Saturday Night

Mostly cloudy, with a low around -7. Southeast wind 7 to 10 mph.

Sunday

Partly sunny, with a high near 36. Southwest wind 10 to 13 mph, with gusts as high as 20 mph.

Sunday Night

Partly cloudy, with a low around 16. West northwest wind around 11 mph.

Monday

Mostly sunny, with a high near 31.

Monday Night

Mostly cloudy, with a low around 20.

Tuesday

A slight chance of rain. Partly sunny, with a high near 40.