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

LOS ALTOS (LOAC1)

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

58°F

14°C

Humidity	78%
Wind Speed	SSE 5 MPH
Barometer	NA
Dewpoint	51°F (11°C)
Visibility	NA
Last update	24 Dec 06:10 PM PST

More Information:

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

Extended Forecast for

5 Miles SSW Los Altos Hills CA

Flood Watch December 24, 07:13pm until December 26, 10:00pm

Wind Advisory December 24, 08:00pm until December 25, 10:00am

Click here for hazard details and duration

Flood Watch

Wind Advisory

Flood Watch December 24, 07:13pm until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
Tonight
Low: 53 °F
Severe
Thunderstorms
and Breezy
then Showers
and Windy
Christmas Day
High: 52 °F
Severe
Thunderstorms
and Breezy
Thursday Night
Low: 49 °F
Breezy.
Severe
Thunderstorms
then Showers
Friday
High: 54 °F
Showers
Friday Night
Low: 46 °F
Showers
Likely
Saturday
High: 53 °F
Slight Chance
Showers
Saturday Night
Low: 42 °F
Mostly Clear
Sunday
High: 53 °F
Sunny

Detailed Forecast

Tonight

Showers and possibly a thunderstorm. Some of the storms could be severe. Steady temperature around 53. Windy, with a south wind 21 to 31 mph, with gusts as high as 65 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

Christmas Day

Showers and possibly a thunderstorm. Some of the storms could be severe. High near 52. Breezy, with a south southwest wind 18 to 22 mph, with gusts as high as 39 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Thursday Night

Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 49. Breezy, with a south southwest wind 21 to 25 mph, with gusts as high as 45 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

Friday

Showers. High near 54. South wind 9 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night

Showers likely before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then a chance of showers after 1am. Mostly cloudy, with a low around 46. South wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday

A 20 percent chance of showers. Mostly sunny, with a high near 53.

Saturday Night

Mostly clear, with a low around 42.

Sunday

Sunny, with a high near 53.

Sunday Night

Clear, with a low around 41.

Monday

Sunny, with a high near 57.

Monday Night

Clear, with a low around 44.