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

Flood Watch until December 26, 10:00 PM PST

Current conditions at

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

57°F

14°C

Humidity	67%
Wind Speed	S 5 MPH
Barometer	NA
Dewpoint	46°F (8°C)
Visibility	NA
Last update	25 Dec 10:10 AM PST

More Information:

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

Extended Forecast for

3 Miles SSW Los Altos Hills CA

Flood Watch December 25, 10:17am until December 26, 10:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch December 25, 10:17am until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
Christmas Day
High: 52 °F
Severe
Thunderstorms
and Breezy
Tonight
Low: 49 °F
Severe
Thunderstorms
and Breezy
then Rain
Likely
Friday
High: 49 °F
Rain
Friday Night
Low: 46 °F
Rain Likely
then Chance
Rain
Saturday
High: 49 °F
Slight Chance
Rain
Saturday Night
Low: 40 °F
Mostly Clear
Sunday
High: 49 °F
Sunny
Sunday Night
Low: 40 °F
Clear

Detailed Forecast

Christmas Day

Showers and possibly a thunderstorm. Some of the storms could be severe. High near 52. Breezy, with a south wind 18 to 28 mph, with gusts as high as 46 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Tonight

Showers and possibly a thunderstorm before 10pm, then rain likely after 10pm. Some of the storms could be severe. Steady temperature around 49. Breezy, with a south southwest wind 17 to 22 mph, with gusts as high as 41 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Friday

Rain. High near 49. South wind 9 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night

Rain likely, mainly before 10pm. Mostly cloudy, with a low around 46. South southwest wind 6 to 8 mph becoming west after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Saturday

A 20 percent chance of rain. Mostly sunny, with a high near 49. North northwest wind around 7 mph.

Saturday Night

Mostly clear, with a low around 40.

Sunday

Sunny, with a high near 49.

Sunday Night

Clear, with a low around 40.

Monday

Sunny, with a high near 52.

Monday Night

Clear, with a low around 42.