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.

Partly Cloudy

59°F

15°C

Humidity	67%
Wind Speed	SSW 13 MPH
Barometer	29.84 in (1010.5 mb)
Dewpoint	48°F (9°C)
Visibility	10.00 mi
Last update	25 Dec 10:35 AM 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, 10:59am until December 26, 10:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch December 25, 10:59am until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
Christmas Day
High: 54 °F
Breezy. Rain
then Severe
Thunderstorms
Tonight
Low: 48 °F
Severe
Thunderstorms
and Breezy
then Rain
Likely
Friday
High: 53 °F
Rain
Friday Night
Low: 44 °F
Chance Rain
Saturday
High: 50 °F
Slight Chance
Rain then
Mostly Sunny
Saturday Night
Low: 38 °F
Mostly Clear
Sunday
High: 50 °F
Sunny
Sunday Night
Low: 37 °F
Clear then
Patchy Frost

Detailed Forecast

Christmas Day

Rain before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then rain after 4pm. Some of the storms could be severe. High near 54. Breezy, with a south southwest wind 20 to 22 mph, with gusts as high as 41 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight

Rain before 7pm, then showers and possibly a thunderstorm between 7pm and 10pm, then rain likely after 10pm. 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 100%. New precipitation amounts between a quarter and half of an inch possible.

Friday

Rain, mainly before 4pm. High near 53. South wind 13 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night

A 40 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 44. South southwest wind around 8 mph. New precipitation amounts of less than a tenth of an inch possible.

Saturday

A 20 percent chance of rain before 10am. Partly sunny, with a high near 50. North wind around 7 mph.

Saturday Night

Mostly clear, with a low around 38.

Sunday

Sunny, with a high near 50.

Sunday Night

Patchy frost after 4am. Otherwise, clear, with a low around 37.

Monday

Patchy frost before 7am. Otherwise, sunny, with a high near 53.

Monday Night

Mostly clear, with a low around 38.