National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Winter Storm Bringing Widespread Hazardous Weather to the Eastern U.S.

A rapidly-intensifying winter storm continues to bring heavy snow, high winds, and blizzard conditions over the Upper Midwest and Great Lakes through today. An Arctic front will lead in a period of gusty to high winds and sharply colder temperatures over the entire eastern U.S. Heavy lake effect snow is then expected from Lakes Erie and Ontario through New Year's Day. Read More >

Hazardous Weather Conditions

Current conditions at

Santa Rosa, Santa Rosa Sonoma County Airport (KSTS)

Lat: 38.5°NLon: 122.81667°WElev: 125.0ft.

Clear

57°F

14°C

Humidity 58%
Wind Speed SSW 4 MPH
Barometer 30.24 in (1024.04 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 29 Dec 04:00 PM PST
Extended Forecast for

Saint Helena CA

Coastal Flood Advisory December 31, 05:00am until January 4, 02:00pm
Cold Weather Advisory December 30, 01:00am until December 30, 09:00am
Click here for hazard details and duration
Coastal Flood Advisory
Cold Weather Advisory

  • Tonight

    Tonight: Patchy frost between 4am and 5am. Otherwise, mostly clear, with a low around 36. Light and variable wind.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Tuesday

    Tuesday: Increasing clouds, with a high near 57. Calm wind becoming northeast 5 to 7 mph in the morning.

    High: 57 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 10 percent chance of rain after 4am. Cloudy, with a low around 43. Calm wind.

    Low: 43 °F

    Cloudy then
    Slight Chance
    Rain

  • Wednesday

    Wednesday: A 50 percent chance of rain, mainly after 10am. Patchy fog after 1pm. Otherwise, cloudy, with a high near 53. Calm wind. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 53 °F

    Chance Rain
    and Patchy
    Fog

  • Wednesday Night

    Wednesday Night: Rain. Patchy fog. Low around 46. Calm wind. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 46 °F

    Rain and
    Patchy Fog

  • New Year's Day

    New Year's Day: Rain. Areas of fog. High near 54. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 54 °F

    Rain and
    Areas Fog

  • Thursday Night

    Thursday Night: Rain. Areas of fog. Low around 49. Chance of precipitation is 90%.

    Low: 49 °F

    Rain and
    Areas Fog

  • Friday

    Friday: Rain. Patchy fog before 10am. Otherwise, cloudy, with a high near 55.

    High: 55 °F

    Rain and
    Patchy Fog

  • Friday Night

    Friday Night: Rain. Patchy fog after 1am. Otherwise, cloudy, with a low around 44.

    Low: 44 °F

    Rain and
    Patchy Fog

Detailed Forecast

Tonight
Patchy frost between 4am and 5am. Otherwise, mostly clear, with a low around 36. Light and variable wind.
Tuesday
Increasing clouds, with a high near 57. Calm wind becoming northeast 5 to 7 mph in the morning.
Tuesday Night
A 10 percent chance of rain after 4am. Cloudy, with a low around 43. Calm wind.
Wednesday
A 50 percent chance of rain, mainly after 10am. Patchy fog after 1pm. Otherwise, cloudy, with a high near 53. Calm wind. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain. Patchy fog. Low around 46. Calm wind. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
New Year's Day
Rain. Areas of fog. High near 54. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain. Areas of fog. Low around 49. Chance of precipitation is 90%.
Friday
Rain. Patchy fog before 10am. Otherwise, cloudy, with a high near 55.
Friday Night
Rain. Patchy fog after 1am. Otherwise, cloudy, with a low around 44.
Saturday
Rain. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 53.
Saturday Night
Rain likely. Patchy fog. Otherwise, mostly cloudy, with a low around 42.
Sunday
Rain likely. Areas of fog. Otherwise, mostly cloudy, with a high near 53.
Sunday Night
Rain likely. Patchy fog. Otherwise, mostly cloudy, with a low around 44.
Monday
Rain likely. Areas of fog. Otherwise, mostly cloudy, with a high near 54.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Helena CA
 38.51°N 122.46°W (Elev. 203 ft)
Last Update:
12:27 pm PST Dec 29, 2025
Forecast Valid:
4pm PST Dec 29, 2025-6pm PST Jan 5, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation