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

READER RANCH (RRRC1)

Lat: 39.30351°NLon: 121.11725°WElev: 1968.0ft.

NA

40°F

4°C

Humidity 59%
Wind Speed NE 3 MPH
Barometer NA
Dewpoint 27°F (-3°C)
Visibility NA
Last update 29 Dec 06:13 AM PST
Extended Forecast for

Penn Valley CA

Frost Advisory until December 29, 09:00am
Click here for hazard details and duration
...
  •  
    Frost Advisory until December 29, 09:00am

    NOW until 9:00am Mon

    Frost Advisory

  • Today

    High: 55 °F

    Sunny

  • Tonight

    Tonight: Areas of frost after 5am. Otherwise, mostly clear, with a low around 36. Light east wind.

    Low: 36 °F

    Mostly Clear
    then Areas
    Frost

  • Tuesday

    Tuesday: Areas of frost before 7am. Otherwise, sunny, with a high near 55. Light and variable wind.

    High: 55 °F

    Areas Frost
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of rain after 10am. Cloudy, with a high near 52. Calm wind.

    High: 52 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain, mainly after 10pm. Low around 45. Chance of precipitation is 80%.

    Low: 45 °F

    Rain

  • New Year's Day

    New Year's Day: Rain. High near 52. Chance of precipitation is 90%.

    High: 52 °F

    Rain

  • Thursday Night

    Thursday Night: Rain. Cloudy, with a low around 46.

    Low: 46 °F

    Rain

Detailed Forecast

Today
Sunny, with a high near 55. East wind around 5 mph becoming calm in the morning.
Tonight
Areas of frost after 5am. Otherwise, mostly clear, with a low around 36. Light east wind.
Tuesday
Areas of frost before 7am. Otherwise, sunny, with a high near 55. Light and variable wind.
Tuesday Night
Mostly cloudy, with a low around 41. Calm wind.
Wednesday
A 30 percent chance of rain after 10am. Cloudy, with a high near 52. Calm wind.
Wednesday Night
Rain, mainly after 10pm. Low around 45. Chance of precipitation is 80%.
New Year's Day
Rain. High near 52. Chance of precipitation is 90%.
Thursday Night
Rain. Cloudy, with a low around 46.
Friday
Rain before 10am, then showers and possibly a thunderstorm between 10am and 4pm, then rain likely and possibly a thunderstorm after 4pm. Cloudy, with a high near 53.
Friday Night
Rain. Cloudy, with a low around 45.
Saturday
Rain likely. Cloudy, with a high near 50.
Saturday Night
Rain likely. Cloudy, with a low around 44.
Sunday
Rain likely. Mostly cloudy, with a high near 49.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Penn Valley CA
 39.19°N 121.18°W (Elev. 1670 ft)
Last Update:
1:21 am PST Dec 29, 2025
Forecast Valid:
6am PST Dec 29, 2025-6pm PST Jan 4, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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