Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

Alturas (KAAT)

Lat: 41.48362°NLon: 120.5615°WElev: 4383.0ft.

Mostly Cloudy

39°F

4°C

Humidity	80%
Wind Speed	S 14 MPH
Barometer	29.57 in (1001.36 mb)
Dewpoint	34°F (1°C)
Visibility	10.00 mi
Wind Chill	31°F (-1°C)
Last update	25 Dec 06:20 AM PST

More Information:

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

Extended Forecast for

Likely CA

Wind Advisory until December 25, 01:00pm

Winter Storm Warning December 25, 06:39am until December 26, 10:00am

Click here for hazard details and duration

Wind Advisory

Winter Storm Warning

Wind Advisory until December 25, 01:00pm
Winter Storm Warning December 25, 06:39am until December 26, 10:00am
NOW: Multiple hazards in effect
Click HERE for Details
Christmas Day
High: 45 °F
Rain/Snow and
Breezy
Tonight
Low: 26 °F
Rain/Snow
then
Rain/Snow
Likely
Friday
High: 42 °F
Snow Likely
Friday Night
Low: 20 °F
Snow Likely
then Chance
Snow
Saturday
High: 37 °F
Slight Chance
Snow
Saturday Night
Low: 11 °F
Partly Cloudy
Sunday
High: 40 °F
Mostly Sunny
Sunday Night
Low: 14 °F
Mostly Clear

Detailed Forecast

Christmas Day

Rain and snow showers. Snow level 5600 feet lowering to 5000 feet in the afternoon . High near 45. Breezy, with a south wind 20 to 23 mph, with gusts as high as 39 mph. Chance of precipitation is 100%. Total daytime snow accumulation of less than a half inch possible.

Tonight

Rain and snow showers before 3am, then a chance of snow showers after 4am. Low around 26. South wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

Friday

A chance of snow showers before 10am, then snow likely after 10am. Mostly cloudy, with a high near 42. South southwest wind 13 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

Friday Night

Snow likely, mainly before 10pm. Mostly cloudy, with a low around 20. Southwest wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

Saturday

A 20 percent chance of snow. Partly sunny, with a high near 37. North northwest wind 3 to 7 mph.

Saturday Night

Partly cloudy, with a low around 11.

Sunday

Mostly sunny, with a high near 40.

Sunday Night

Mostly clear, with a low around 14.

Monday

Sunny, with a high near 45.

Monday Night

Mostly clear, with a low around 18.