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.

61°F

16°C

Humidity	58%
Wind Speed	SSW 5 MPH
Barometer	NA
Dewpoint	46°F (8°C)
Visibility	NA
Last update	25 Dec 12:10 PM 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, 12:47pm until December 26, 10:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch December 25, 12:47pm until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
Christmas Day
High: 48 °F
Severe
Thunderstorms
and Breezy
Tonight
Low: 44 °F
Breezy.
Severe
Thunderstorms
then Showers
Likely
Friday
High: 47 °F
Showers
Friday Night
Low: 43 °F
Showers
Likely
Saturday
High: 49 °F
Slight Chance
Showers
Saturday Night
Low: 41 °F
Mostly Clear
Sunday
High: 50 °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 48. Breezy, with a south wind around 22 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Tonight

Showers and possibly a thunderstorm before 1am, then showers likely. Some of the storms could be severe. Low around 44. Breezy, with a south southwest wind 23 to 28 mph, with gusts as high as 41 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

Friday

Showers, with thunderstorms also possible after 4pm. High near 47. South southwest wind 16 to 21 mph decreasing to 9 to 14 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Friday Night

A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 10pm, then a chance of showers after 10pm. Mostly cloudy, with a low around 43. South wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday

A 20 percent chance of showers. Mostly sunny, with a high near 49. North northwest wind 6 to 10 mph.

Saturday Night

Mostly clear, with a low around 41.

Sunday

Sunny, with a high near 50.

Sunday Night

Clear, with a low around 40.

Monday

Sunny, with a high near 53.

Monday Night

Clear, with a low around 43.