Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Mist

45°F

7°C

Humidity 93%
Wind Speed E 11 MPH
Barometer 30.23 in (1023.71 mb)
Dewpoint 43°F (6°C)
Visibility 4.00 mi
Wind Chill39°F (4°C)
Last update 10 Dec 12:20 AM PST
Extended Forecast for

2 Miles NNW Vallejo CA

  • Overnight

    Overnight: Patchy fog.  Otherwise, mostly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy dense fog before 7am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 49. East northeast wind 3 to 6 mph.

    High: 49 °F

    Patchy Dense
    Fog then
    Sunny

  • Wednesday Night

    Wednesday Night: Patchy dense fog before 7pm, then patchy dense fog after 8pm.  Otherwise, mostly clear, with a low around 41. Calm wind.

    Low: 41 °F

    Patchy Dense
    Fog

  • Thursday

    Thursday: Sunny, with a high near 52. East wind around 6 mph.

    High: 52 °F

    Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 9pm.  Otherwise, mostly clear, with a low around 41. Calm wind.

    Low: 41 °F

    Patchy Fog

  • Friday

    Friday: Mostly sunny, with a high near 55.

    High: 55 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Patchy fog after 2am.  Otherwise, mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy fog.  Otherwise, partly cloudy, with a low around 42.

    Low: 42 °F

    Patchy Fog

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly cloudy, with a low around 42. Calm wind.
Wednesday
Patchy dense fog before 7am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 49. East northeast wind 3 to 6 mph.
Wednesday Night
Patchy dense fog before 7pm, then patchy dense fog after 8pm. Otherwise, mostly clear, with a low around 41. Calm wind.
Thursday
Sunny, with a high near 52. East wind around 6 mph.
Thursday Night
Patchy fog after 9pm. Otherwise, mostly clear, with a low around 41. Calm wind.
Friday
Mostly sunny, with a high near 55.
Friday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 41.
Saturday
Mostly sunny, with a high near 58.
Saturday Night
Patchy fog. Otherwise, partly cloudy, with a low around 42.
Sunday
Areas of fog before 10am. Otherwise, partly sunny, with a high near 57.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 44.
Monday
A slight chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 58.
Monday Night
A chance of rain. Mostly cloudy, with a low around 51.
Tuesday
A chance of rain. Mostly cloudy, with a high near 59.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Vallejo CA
 38.16°N 122.25°W (Elev. 26 ft)
12:26 am PST Dec 10, 2025
12am PST Dec 10, 2025-6pm PST Dec 16, 2025
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database