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.

52°F

11°C

Humidity	82%
Wind Speed	WSW 3 MPH
Barometer	NA
Dewpoint	47°F (8°C)
Visibility	NA
Last update	26 Dec 01:10 AM PST

More Information:

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

Extended Forecast for

2 Miles SE Los Altos CA

Flood Watch December 26, 01:32am until December 26, 10:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch December 26, 01:32am until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
Overnight
Low: 48 °F
Showers
Likely
Friday
High: 57 °F
Chance
Showers
Friday Night
Low: 44 °F
Chance
Showers
Saturday
High: 54 °F
Mostly Sunny
Saturday Night
Low: 37 °F
Mostly Clear
then Patchy
Frost
Sunday
High: 55 °F
Patchy Frost
then Sunny
Sunday Night
Low: 37 °F
Clear then
Patchy Frost
Monday
High: 58 °F
Patchy Frost
then Sunny

Detailed Forecast

Overnight

Showers likely, mainly after 3am. Mostly cloudy, with a low around 48. South wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Friday

A chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 57. South southeast wind 9 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 44. South wind 5 to 7 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday

Mostly sunny, with a high near 54. North northwest wind around 6 mph.

Saturday Night

Patchy frost after 5am. Otherwise, mostly clear, with a low around 37. North wind around 5 mph becoming calm in the evening.

Sunday

Patchy frost before 7am. Otherwise, sunny, with a high near 55.

Sunday Night

Patchy frost after 5am. Otherwise, mostly clear, with a low around 37.

Monday

Patchy frost before 7am. Otherwise, sunny, with a high near 58.

Monday Night

Mostly clear, with a low around 39.