Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

Hazardous Weather Conditions

Winter Weather Advisory in effect from December 23, 04:00 PM MST until December 24, 09:00 AM MST

Current conditions at

HARLEM (HRLM)

Lat: 48.54333°NLon: 108.83472°WElev: 2358.0ft.

24°F

-4°C

Humidity	82%
Wind Speed	ENE 2 MPH
Barometer	NA
Dewpoint	20°F (-7°C)
Visibility	NA
Last update	23 Dec 08:00 PM MST

More Information:

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

Extended Forecast for

Chinook MT

Winter Weather Advisory until December 24, 09:00am

Click here for hazard details and duration

Winter Weather Advisory

Winter Weather Advisory until December 24, 09:00am
NOW until 9:00am Wed
Winter Weather Advisory
Tonight
Low: 17 °F
Slight Chance
Freezing Rain
and Patchy
Fog then
Patchy Fog
Wednesday
High: 28 °F
Patchy Fog
then Mostly
Cloudy
Wednesday Night
Low: 19 °F
Chance
Freezing Rain
and Patchy
Fog
Christmas Day
High: 30 °F
Chance
Freezing Rain
and Patchy
Fog then
Partly Sunny
Thursday Night
Low: 21 °F
Mostly Cloudy
Friday
High: 40 °F
Mostly Cloudy
then Slight
Chance Rain
Friday Night
Low: 0 °F
Slight Chance
Rain/Snow
then Slight
Chance Snow
Saturday
High: 8 °F
Partly Sunny

Detailed Forecast

Tonight

A slight chance of freezing rain before midnight. Patchy fog. Otherwise, mostly cloudy, with a low around 17. East wind 5 to 7 mph. Chance of precipitation is 20%.

Wednesday

Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 28. East wind 10 to 15 mph, with gusts as high as 23 mph.

Wednesday Night

A chance of freezing rain after 11pm. Patchy fog after 2am. Otherwise, cloudy, with a low around 19. East wind 6 to 13 mph. Chance of precipitation is 50%.

Christmas Day

A chance of freezing rain before 11am. Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 30. Light south wind. Chance of precipitation is 30%.

Thursday Night

Mostly cloudy, with a low around 21. Southeast wind around 5 mph.

Friday

A 10 percent chance of rain after 5pm. Mostly cloudy, with a high near 40. South wind 6 to 11 mph becoming west in the afternoon. Winds could gust as high as 20 mph.

Friday Night

A slight chance of rain and snow before 8pm, then a slight chance of snow. Mostly cloudy, with a low around 0. West northwest wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

Saturday

Partly sunny, with a high near 8. West northwest wind around 18 mph, with gusts as high as 28 mph.

Saturday Night

Partly cloudy, with a low around -7.

Sunday

Mostly sunny, with a high near 19.

Sunday Night

Partly cloudy, with a low around 6.

Monday

Mostly sunny, with a high near 37.

Monday Night

Mostly cloudy, with a low around 21.