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

LA HONDA (LAHC1)

Lat: 37.30523°NLon: 122.25525°WElev: 804.0ft.

51°F

11°C

Humidity	91%
Wind Speed	SW 5 MPH
Barometer	NA
Dewpoint	48°F (9°C)
Visibility	NA
Last update	26 Dec 12:07 AM PST

More Information:

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

Extended Forecast for

2 Miles WSW Portola Valley CA

Flood Watch December 26, 01:02am until December 26, 10:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch December 26, 01:02am until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
Overnight
Low: 47 °F
Showers
Likely
Friday
High: 51 °F
Showers
Likely
Friday Night
Low: 47 °F
Showers
Likely then
Chance
Showers
Saturday
High: 51 °F
Slight Chance
Showers then
Mostly Sunny
Saturday Night
Low: 39 °F
Mostly Clear
Sunday
High: 52 °F
Sunny
Sunday Night
Low: 40 °F
Mostly Clear
Monday
High: 54 °F
Sunny

Detailed Forecast

Overnight

Showers likely, mainly between 3am and 5am. Mostly cloudy, with a low around 47. Southwest wind 18 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Friday

Showers likely before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 51. South southwest wind 10 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night

Showers and thunderstorms likely before 10pm, then a chance of showers. Mostly cloudy, with a steady temperature around 47. South southwest wind around 9 mph becoming west northwest after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday

A 20 percent chance of showers before 10am. Mostly sunny, with a high near 51. North northwest wind around 8 mph.

Saturday Night

Mostly clear, with a low around 39. Northeast wind around 6 mph.

Sunday

Sunny, with a high near 52.

Sunday Night

Mostly clear, with a low around 40.

Monday

Sunny, with a high near 54.

Monday Night

Mostly clear, with a low around 41.