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

Livermore, Livermore Municipal Airport (KLVK)

Lat: 37.69278°NLon: 121.81444°WElev: 397.0ft.

Rain

56°F

13°C

Humidity	69%
Wind Speed	S 13 MPH
Barometer	29.77 in (1008.13 mb)
Dewpoint	46°F (8°C)
Visibility	4.00 mi
Last update	25 Dec 05:53 PM PST

More Information:

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

Extended Forecast for

4 Miles E Union City CA

Flood Watch December 25, 06:06pm until December 26, 10:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch December 25, 06:06pm until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
Tonight
Low: 48 °F
Severe
Thunderstorms
and Breezy
then Chance
Showers
Friday
High: 53 °F
Chance
Showers
Friday Night
Low: 45 °F
Chance
Showers
Saturday
High: 51 °F
Mostly Sunny
Saturday Night
Low: 38 °F
Mostly Clear
Sunday
High: 51 °F
Sunny
Sunday Night
Low: 37 °F
Mostly Clear
Monday
High: 53 °F
Sunny

Detailed Forecast

Tonight

Showers and possibly a thunderstorm before 11pm, then showers likely. Some of the storms could be severe. Low around 48. Breezy, with a south southwest wind 18 to 22 mph, with gusts as high as 39 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

Friday

A chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 53. South wind 11 to 18 mph, with gusts as high as 31 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 45. South wind around 9 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 51. North northwest wind around 7 mph.

Saturday Night

Mostly clear, with a low around 38. Northeast wind around 6 mph.

Sunday

Sunny, with a high near 51.

Sunday Night

Mostly clear, with a low around 37.

Monday

Sunny, with a high near 53.

Monday Night

Mostly clear, with a low around 38.