Heavy Great Lakes Snow through Friday; Watching Potential for Major Winter Storm Late Week into this Weekend

Heavy lake effect snow will continue in the Great Lakes into Wednesday before another storm brings a widespread general snow followed by another round of heavy lake effect snow. A wide-ranging winter storm will produce great swaths of heavy snow, sleet, and treacherous freezing rain from the southern Rockies/Plains and Mid-South starting Friday and shifting toward the East Coast through Sunday. Read More >

Current conditions at

ILLINOIS VALLEY AIRPORT (SBFO3)

Lat: 42.10375°NLon: 123.68508°WElev: 1389.0ft.

NA

46°F

8°C

Humidity 77%
Wind Speed NE 2 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Last update 20 Jan 12:52 PM PST
Extended Forecast for

17 Miles SSE Agness OR

Air Stagnation Advisory January 20, 01:31pm until January 21, 04:00pm
Freezing Fog Advisory January 20, 07:00pm until January 21, 12:00pm
Click here for hazard details and duration
Air Stagnation Advisory
Freezing Fog Advisory
  •  
    Air Stagnation Advisory January 20, 01:31pm until January 21, 04:00pm

    NOW until 4:00pm Wed

    Air Stagnation Advisory

  • This Afternoon

    High: 61 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 49. East wind 3 to 5 mph.

    Low: 49 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 58. Light and variable wind.

    High: 58 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 45. East northeast wind around 5 mph.

    Low: 45 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 53. North wind around 6 mph.

    High: 53 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 61. Calm wind.
Tonight
Mostly cloudy, with a low around 49. East wind 3 to 5 mph.
Wednesday
Mostly cloudy, with a high near 58. Light and variable wind.
Wednesday Night
Partly cloudy, with a low around 45. East northeast wind around 5 mph.
Thursday
Sunny, with a high near 53. North wind around 6 mph.
Thursday Night
Mostly clear, with a low around 39.
Friday
Sunny, with a high near 49.
Friday Night
Mostly clear, with a low around 35.
Saturday
Mostly sunny, with a high near 53.
Saturday Night
Mostly cloudy, with a low around 42.
Sunday
Mostly cloudy, with a high near 51.
Sunday Night
A slight chance of rain. Mostly cloudy, with a low around 42.
Monday
A slight chance of rain. Snow level 5500 feet. Partly sunny, with a high near 53.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
17 Miles SSE Agness OR
 42.32°N 123.96°W (Elev. 2408 ft)
12:42 pm PST Jan 20, 2026
1pm PST Jan 20, 2026-6pm PST Jan 26, 2026
 
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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