Heavy Rain and Mountain Snow Lingers in California; Winter Storm Impacting the Great Lakes and Northeast U.S.

An atmospheric river will wind down through today across California with lingering heavy rainfall, heavy mountain snow, and gusty winds. A wintry mix of freezing rain, sleet, and snow will cause hazardous travel conditions for the Great Lakes into the northern Mid-Atlantic and southern New England today through Saturday morning. Areas of tree damage and power outages are possible. Read More >

Hazardous Weather Conditions

Flood Watch until December 26, 10:00 PM PST

Current conditions at

Napa, Napa County Airport (KAPC)

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

Overcast

55°F

13°C

Humidity	76%
Wind Speed	SSE 8 MPH
Barometer	29.9 in (1012.53 mb)
Dewpoint	48°F (9°C)
Visibility	10.00 mi
Last update	26 Dec 08:35 AM PST

More Information:

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

Extended Forecast for

4 Miles E Saint Helena CA

Flood Watch December 26, 08:59am until December 26, 10:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch December 26, 08:59am until December 26, 10:00pm
NOW until 10:00pm Fri
Flood Watch
Today
High: 50 °F
Showers
Likely
Tonight
Low: 39 °F
Chance
Showers and
Patchy Fog
Saturday
High: 50 °F
Patchy Fog
then Sunny
Saturday Night
Low: 35 °F
Mostly Clear
then Patchy
Frost
Sunday
High: 53 °F
Areas Frost
then Sunny
Sunday Night
Low: 35 °F
Mostly Clear
then Patchy
Frost
Monday
High: 55 °F
Areas Frost
then Sunny
Monday Night
Low: 35 °F
Mostly Clear
then Patchy
Frost

Detailed Forecast

Today

Showers likely before 1pm, then showers likely and possibly a thunderstorm between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 50. South southeast wind 7 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight

A 40 percent chance of showers, mainly before 10pm. Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 39. Calm wind. New precipitation amounts of less than a tenth of an inch possible.

Saturday

Patchy fog before 10am. Otherwise, mostly sunny, with a high near 50. Calm wind becoming north around 5 mph in the afternoon.

Saturday Night

Patchy frost after 1am. Otherwise, partly cloudy, with a low around 35. Calm wind.

Sunday

Areas of frost before 9am. Otherwise, sunny, with a high near 53. Calm wind becoming north around 5 mph in the morning.

Sunday Night

Patchy frost after 1am. Otherwise, mostly clear, with a low around 35.

Monday

Areas of frost before 8am. Otherwise, sunny, with a high near 55.

Monday Night

Patchy frost after 4am. Otherwise, mostly clear, with a low around 35.