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 Storm Watch in effect from December 24, 06:00 PM MST until December 25, 11:00 AM MST

Current conditions at

HARLEM (HRLM)

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

19°F

-7°C

Humidity	92%
Wind Speed	E 3 MPH
Barometer	NA
Dewpoint	17°F (-8°C)
Visibility	NA
Last update	24 Dec 04:00 AM MST

More Information:

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

Extended Forecast for

Chinook MT

Winter Storm Watch December 24, 06:00pm until December 25, 11:00am

Click here for hazard details and duration

Winter Storm Watch

Today
High: 27 °F
Patchy Fog
then Mostly
Cloudy
Tonight
Low: 22 °F
Chance Snow
and Patchy
Fog then
Wintry Mix
and Patchy
Fog
Christmas Day
High: 30 °F
Chance
Freezing Rain
and Patchy
Fog then
Partly Sunny
Thursday Night
Low: 20 °F
Mostly Cloudy
Friday
High: 39 °F
Slight Chance
Rain
Friday Night
Low: 0 °F
Slight Chance
Rain/Snow
then Slight
Chance Snow
Saturday
High: 11 °F
Partly Sunny
and Blustery
Saturday Night
Low: -9 °F
Partly Cloudy
Sunday
High: 16 °F
Mostly Sunny

Detailed Forecast

Today

Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 27. East wind 9 to 15 mph, with gusts as high as 24 mph.

Tonight

Snow and freezing rain before 4am, then snow likely between 4am and 5am, then snow and freezing rain likely after 5am. Patchy fog after 8pm. Steady temperature around 22. East southeast wind 5 to 11 mph. Chance of precipitation is 90%. New ice accumulation of less than a 0.1 of an inch possible. Little or no snow accumulation expected.

Christmas Day

A chance of freezing rain before 11am. Patchy fog before 11am. Otherwise, partly sunny, with a high near 30. Light and variable wind. Chance of precipitation is 50%.

Thursday Night

Mostly cloudy, with a low around 20. Light and variable wind becoming south southeast around 5 mph after midnight.

Friday

A 20 percent chance of rain after 11am. Mostly cloudy, with a high near 39. Southwest wind 5 to 10 mph.

Friday Night

A slight chance of rain and snow before 11pm, then a slight chance of snow. Mostly cloudy, with a low around 0. West wind 10 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

Saturday

Partly sunny, with a high near 11. Blustery, with a west northwest wind 18 to 22 mph, with gusts as high as 32 mph.

Saturday Night

Partly cloudy, with a low around -9. West northwest wind 12 to 17 mph decreasing to 6 to 11 mph in the evening. Winds could gust as high as 25 mph.

Sunday

Mostly sunny, with a high near 16.

Sunday Night

Partly cloudy, with a low around 5.

Monday

Mostly sunny, with a high near 37.

Monday Night

Mostly cloudy, with a low around 21.