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

Napa, Napa County Airport (KAPC)

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

rain,mist

57°F

14°C

Humidity	93%
Wind Speed	S 17 MPH
Barometer	29.5 in (998.99 mb)
Dewpoint	55°F (13°C)
Visibility	5.00 mi
Last update	24 Dec 04:00 AM PST

More Information:

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

Extended Forecast for

2 Miles SSW Lake Berryessa CA

Flood Watch December 24, 04:24am until December 26, 10:00pm

Wind Advisory December 24, 04:24am until December 24, 08:00am

Click here for hazard details and duration

Flood Watch

Wind Advisory

Flood Watch December 24, 04:24am until December 26, 10:00pm
Wind Advisory December 24, 04:24am until December 24, 08:00am
NOW: Multiple hazards in effect
Click HERE for Details
Overnight
Low: 48 °F
Showers and
Windy
Wednesday
High: 51 °F
Chance
Showers then
Severe
Thunderstorms
Wednesday Night
Low: 51 °F
Breezy.
Severe
Thunderstorms
then Showers
Christmas Day
High: 50 °F
Showers and
Breezy
Thursday Night
Low: 46 °F
Showers
Friday
High: 49 °F
Showers
Friday Night
Low: 43 °F
Showers
Likely and
Patchy Fog
Saturday
High: 50 °F
Slight Chance
Showers then
Mostly Sunny

Detailed Forecast

Overnight

Showers. Low around 48. Windy, with a south southwest wind 32 to 36 mph, with gusts as high as 55 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Wednesday

Showers and thunderstorms likely, then showers and possibly a thunderstorm after 5pm. Some of the storms could be severe. Steady temperature around 51. South southwest wind 13 to 21 mph becoming southeast in the afternoon. Winds could gust as high as 30 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 possibly a thunderstorm. Some of the storms could be severe. Steady temperature around 51. Breezy, with a south southeast wind 21 to 25 mph, with gusts as high as 48 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

Christmas Day

Showers, with thunderstorms also possible after 1pm. High near 50. Breezy, with a south southwest wind 20 to 24 mph, with gusts as high as 46 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

Thursday Night

Showers and possibly a thunderstorm. Low around 46. South wind around 17 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

Friday

Showers, with thunderstorms also possible after 1pm. High near 49. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Friday Night

Showers likely and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Patchy fog before 7pm. Otherwise, mostly cloudy, with a low around 43. Chance of precipitation is 60%.

Saturday

A slight chance of showers before 10am. Mostly sunny, with a high near 50.

Saturday Night

Mostly clear, with a low around 39.

Sunday

Sunny, with a high near 50.

Sunday Night

Mostly clear, with a low around 38.

Monday

Sunny, with a high near 52.

Monday Night

Mostly clear, with a low around 41.