Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

Hazardous Weather Conditions

Current conditions at

Livermore, Livermore Municipal Airport (KLVK)

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

Rain

61°F

16°C

Humidity	77%
Wind Speed	ENE 4 MPH
Barometer	29.48 in (998.31 mb)
Dewpoint	54°F (12°C)
Visibility	10.00 mi
Last update	24 Dec 02:53 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 24, 03:04am until December 26, 10:00pm

Wind Advisory until December 24, 04:00am

Click here for hazard details and duration

Flood Watch

Wind Advisory

Flood Watch December 24, 03:04am until December 26, 10:00pm
Wind Advisory until December 24, 04:00am
NOW: Multiple hazards in effect
Click HERE for Details
Overnight
Low: 53 °F
Showers and
Breezy
Wednesday
High: 55 °F
Chance
Showers then
Severe
Thunderstorms
Wednesday Night
Low: 51 °F
Severe
Thunderstorms
and Breezy
Christmas Day
High: 54 °F
Breezy.
Severe
Thunderstorms
then Showers
Thursday Night
Low: 48 °F
Severe
Thunderstorms
Friday
High: 53 °F
Showers
Friday Night
Low: 43 °F
Showers
Likely
Saturday
High: 51 °F
Slight Chance
Showers then
Mostly Sunny

Detailed Forecast

Overnight

Showers and possibly a thunderstorm. Low around 53. Breezy, with a south wind around 25 mph, with gusts as high as 50 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday

A chance of showers, then showers and possibly a thunderstorm after 4pm. Some of the storms could be severe. Steady temperature around 55. South wind 7 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night

Showers and thunderstorms before 2am, then showers between 2am and 4am, then showers and possibly a thunderstorm after 4am. Some of the storms could be severe. Low around 51. Breezy, with a south wind 17 to 26 mph, with gusts as high as 50 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Christmas Day

Showers and possibly a thunderstorm. Some of the storms could be severe. High near 54. Breezy, with a south wind 20 to 25 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Thursday Night

Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 48. South wind 18 to 21 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Friday

Showers, with thunderstorms also possible after 4pm. High near 53. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night

Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.

Saturday

A slight chance of showers before 10am. Partly sunny, with a high near 51.

Saturday Night

Mostly clear, with a low around 38.

Sunday

Sunny, with a high near 51.

Sunday Night

Mostly clear, with a low around 38.

Monday

Sunny, with a high near 53.

Monday Night

Mostly clear, with a low around 40.