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.

57°F

14°C

Humidity	80%
Wind Speed	SSE 7 MPH
Barometer	NA
Dewpoint	51°F (11°C)
Visibility	NA
Last update	25 Dec 12:10 AM PST

More Information:

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

Extended Forecast for

5 Miles WSW Saratoga CA

Flood Watch December 25, 12:22am until December 26, 10:00pm

Wind Advisory until December 25, 10:00am

Flood Advisory until December 25, 03:15am

Click here for hazard details and duration

Flood Watch

Wind Advisory

Flood Advisory

Flood Watch December 25, 12:22am until December 26, 10:00pm
Wind Advisory until December 25, 10:00am
Flood Advisory until December 25, 03:15am
NOW: Multiple hazards in effect
Click HERE for Details
Overnight
Low: 49 °F
Severe
Thunderstorms
and Windy
Christmas Day
High: 48 °F
Severe
Thunderstorms
and Windy
Thursday Night
Low: 44 °F
Breezy.
Severe
Thunderstorms
then Rain
Friday
High: 48 °F
Rain
Friday Night
Low: 46 °F
Rain Likely
then Chance
Rain
Saturday
High: 48 °F
Slight Chance
Rain/Snow
then Slight
Chance Rain
Saturday Night
Low: 41 °F
Mostly Clear
Sunday
High: 50 °F
Sunny

Detailed Forecast

Overnight

Showers and possibly a thunderstorm. Some of the storms could be severe. Steady temperature around 49. Windy, with a south southwest wind 37 to 42 mph increasing to 50 to 55 mph. Winds could gust as high as 70 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Christmas Day

Rain and possibly a thunderstorm before 7am, then rain between 7am and 10am, then showers and possibly a thunderstorm after 10am. Some of the storms could be severe. High near 48. Windy, with a south southwest wind 32 to 37 mph decreasing to 22 to 27 mph in the afternoon. Winds could gust as high as 49 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

Thursday Night

Showers and possibly a thunderstorm before 10pm, then rain, mainly after 10pm. Some of the storms could be severe. Low around 44. Breezy, with a southwest wind 24 to 29 mph, with gusts as high as 43 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

Friday

Rain. High near 48. South wind 11 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Friday Night

Rain likely, mainly before 10pm. Mostly cloudy, with a low around 46. South southwest wind 7 to 10 mph becoming west northwest after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Saturday

A slight chance of rain and snow before 10am, then a slight chance of rain. Mostly sunny, with a high near 48. Chance of precipitation is 20%.

Saturday Night

Mostly clear, with a low around 41.

Sunday

Sunny, with a high near 50.

Sunday Night

Clear, with a low around 41.

Monday

Sunny, with a high near 53.

Monday Night

Clear, with a low around 43.