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

KF6YUA Sebastopol (AR323)

Lat: 38.3803°NLon: 122.8242°WElev: 230.0ft.

NA

43°F

6°C

Humidity 99%
Wind Speed E 2 MPH
Barometer 30.27 in (1025.06 mb)
Dewpoint 43°F (6°C)
Visibility NA
Last update 10 Dec 12:26 AM PST
Extended Forecast for

8 Miles SW Saint Helena CA

  • Overnight

    Overnight: Mostly clear, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Clear

  • Wednesday

    Wednesday: Patchy fog between 9am and 10am.  Otherwise, sunny, with a high near 50. Calm wind.

    High: 50 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 45. Calm wind.

    Low: 45 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 55. Calm wind.

    High: 55 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 1am.  Otherwise, partly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Clear
    then Patchy
    Fog

Detailed Forecast

Overnight
Mostly clear, with a low around 40. Calm wind.
Wednesday
Patchy fog between 9am and 10am. Otherwise, sunny, with a high near 50. Calm wind.
Wednesday Night
Mostly clear, with a low around 45. Calm wind.
Thursday
Sunny, with a high near 55. Calm wind.
Thursday Night
Mostly clear, with a low around 44. Calm wind.
Friday
Sunny, with a high near 58.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 62.
Saturday Night
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 42.
Sunday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 60.
Sunday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 44.
Monday
A chance of rain. Areas of fog. Otherwise, mostly cloudy, with a high near 59.
Monday Night
A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a low around 50.
Tuesday
A chance of rain. Areas of fog. Otherwise, partly sunny, with a high near 60.
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ABOUT THIS FORECAST

 
Point Forecast:
8 Miles SW Saint Helena CA
 38.41°N 122.55°W (Elev. 492 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