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° N Lon: 122.27944° W Elev: 33.0 ft.

rain,mist

59°F

15°C

Humidity	93%
Wind Speed	S 11 MPH
Barometer	29.52 in (999.66 mb)
Dewpoint	57°F (14°C)
Visibility	6.00 mi
Last update	24 Dec 03:35 AM PST

More Information:

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

Detailed forecast for

North Bay Interior Mountains

Rest Of Tonight

Breezy. Showers and a slight chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Lows in the upper 40s. South winds 20 to 30 mph with gusts to around 60 mph.

Wednesday

Mostly cloudy. Breezy. A chance of showers. A slight chance of thunderstorms in the afternoon. Some thunderstorms may produce heavy rainfall in the afternoon. Highs in the lower to mid 50s. Southwest winds 20 to 30 mph...becoming southeast 10 to 20 mph in the afternoon. Gusts up to 45 mph.

Wednesday Night

Breezy. Showers and a slight chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Lows in the upper 40s. South winds 15 to 20 mph with gusts to around 45 mph...becoming 20 to 30 mph with gusts to around 60 mph after midnight.

Christmas Day

Showers and a slight chance of thunderstorms. Some thunderstorms may be severe with heavy rainfall. Highs in the lower 50s. South winds 10 to 20 mph. Gusts up to 50 mph decreasing to 35 mph in the afternoon.

Thursday Night

A slight chance of thunderstorms in the evening. Showers. Some thunderstorms may be severe with heavy rainfall. Lows in the upper 40s. South winds 10 to 20 mph.

Friday

Showers likely and a slight chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Highs around 50.

Friday Night

Patchy fog. Showers likely and a slight chance of thunderstorms. Some thunderstorms may produce heavy rainfall. Lows in the mid 40s.

Saturday

Mostly cloudy in the morning then becoming partly cloudy. Patchy fog. A slight chance of showers. Highs near 50.

Saturday Night Through Tuesday

Mostly clear. Lows in the lower 40s. Highs in the upper 40s to lower 60s.