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

Current conditions at

Napa, Napa County Airport (KAPC)

Lat: 38.2075°NLon: 122.27944°WElev: 33.0ft.

Rain

58°F

14°C

Humidity	83%
Wind Speed	E 11 MPH
Barometer	29.6 in (1002.37 mb)
Dewpoint	53°F (12°C)
Visibility	9.00 mi
Last update	24 Dec 04:54 PM PST

More Information:

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

Extended Forecast for

2 Miles NW Vallejo CA

Flood Watch December 24, 05:02pm until December 26, 10:00pm

Wind Advisory December 24, 08:00pm until December 25, 10:00am

Click here for hazard details and duration

Flood Watch

Wind Advisory

Flood Watch December 24, 05:02pm until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
This Afternoon
High: 55 °F
Severe
Thunderstorms
Tonight
Low: 55 °F
Breezy.
Severe
Thunderstorms
then Showers
Christmas Day
High: 54 °F
Severe
Thunderstorms
and Breezy
Thursday Night
Low: 50 °F
Breezy.
Severe
Thunderstorms
then Showers
Friday
High: 52 °F
Showers
Friday Night
Low: 43 °F
Chance
Showers
Saturday
High: 51 °F
Slight Chance
Showers then
Mostly Sunny
Saturday Night
Low: 38 °F
Mostly Clear

Detailed Forecast

This Afternoon

Showers and possibly a thunderstorm. Some of the storms could be severe. Steady temperature around 55. South wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight

Showers and possibly a thunderstorm. Some of the storms could be severe. Steady temperature around 55. Breezy, with a south southeast wind 17 to 25 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 21 to 23 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New rainfall 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 50. Breezy, with a south southwest wind 20 to 25 mph, with gusts as high as 41 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Friday

Showers. High near 52. South wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night

A 50 percent chance of showers, mainly before 4am. Mostly cloudy, with a low around 43. New precipitation amounts of less than a tenth of an inch possible.

Saturday

A 20 percent chance of showers before 10am. Partly sunny, with a high near 51.

Saturday Night

Mostly clear, with a low around 38.

Sunday

Mostly sunny, with a high near 51.

Sunday Night

Patchy frost after 4am. Otherwise, mostly clear, with a low around 36.

Monday

Patchy frost. Otherwise, sunny, with a high near 51.

Monday Night

Mostly clear, with a low around 37.