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

Hazardous Weather Outlook

Current conditions at

Spearfish / Clyde Ice (KSPF)

Lat: 44.48°NLon: 103.78°WElev: 3898ft.

Fair

34°F

1°C

Humidity	75%
Wind Speed	W 20 G 29 mph
Barometer	30.03 in
Dewpoint	27°F (-3°C)
Visibility	10.00 mi
Wind Chill	23°F (-5°C)
Last update	9 Dec 11:15 pm MST

More Information:

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

Extended Forecast for

Lead SD

Tonight
Low: 25 °F
Chance Snow
Wednesday
High: 42 °F
Snow Likely
then Wintry
Mix Likely
Wednesday Night
Low: 38 °F⇑
Rain Likely
Thursday
High: 48 °F⇓
Chance
Rain/Snow
then Rain
Thursday Night
Low: 18 °F
Rain/Snow
then Snow
Friday
High: 21 °F
Snow
Friday Night
Low: 9 °F
Snow Likely
Saturday
High: 21 °F
Chance Snow
Saturday Night
Low: 11 °F
Partly Cloudy

Detailed Forecast

Tonight

A 30 percent chance of snow, mainly before 3am. Mostly cloudy, with a low around 25. Wind chill values as low as 17. Northwest wind 9 to 15 mph, with gusts as high as 34 mph.

Wednesday

Snow likely before 3pm, then rain and snow likely, possibly mixed with sleet between 3pm and 4pm, then rain likely after 4pm. Mostly cloudy, with a high near 42. Wind chill values as low as 17. Southwest wind 3 to 6 mph. Winds could gust as high as 21 mph. Chance of precipitation is 70%. New snow and sleet accumulation of less than a half inch possible.

Wednesday Night

Rain likely, mainly before 11pm. Cloudy, with a temperature rising to around 43 by 3am. West wind around 10 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.

Thursday

A chance of rain before 8am, then a chance of rain and snow between 8am and 9am, then rain after 9am. Temperature rising to near 48 by 11am, then falling to around 39 during the remainder of the day. Northwest wind around 10 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

Thursday Night

Rain and snow, becoming all snow after 7pm. Low around 18. Northwest wind 7 to 10 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

Friday

Snow. Steady temperature around 21. Northwest wind around 5 mph becoming light and variable in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

Friday Night

Snow likely. Mostly cloudy, with a low around 9. Light and variable wind becoming southeast around 5 mph. Winds could gust as high as 16 mph. Chance of precipitation is 70%.

Saturday

A chance of snow, mainly before 11am. Partly sunny, with a high near 21. Northwest wind 3 to 6 mph. Winds could gust as high as 15 mph.

Saturday Night

Partly cloudy, with a low around 11.

Sunday

Mostly sunny, with a high near 44.

Sunday Night

Partly cloudy, with a low around 28.

Monday

Mostly sunny, with a high near 45.

Monday Night

Partly cloudy, with a low around 30.