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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

ROCK CREEK (RCEC1)

Lat: 37.55983°NLon: 118.67841°WElev: 7103.0ft.

NA

34°F

1°C

Humidity 97%
Wind Speed NE 3 MPH
Barometer NA
Dewpoint 33°F (1°C)
Visibility NA
Last update 24 Dec 02:04 PM PST
Extended Forecast for

15 Miles W Chalfant CA

Winter Storm Warning until December 26, 10:00am
Click here for hazard details and duration
Winter Storm Warning
  •  
    Winter Storm Warning until December 26, 10:00am

    NOW until 10:00am Fri

    Winter Storm Warning

  • This Afternoon

    High: 40 °F

    Rain/Snow

  • Tonight

    Tonight: Rain and snow likely before 7pm, then snow. Areas of freezing fog after 3am. Low around 29. Breezy, with a southeast wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Rain/Snow
    Likely and
    Breezy then
    Snow and
    Areas
    Freezing Fog

  • Christmas Day

    Christmas Day: Snow, mainly after 7am. The snow could be heavy at times. Widespread dense fog, mainly between 10am and 11am. Widespread dense freezing fog between 7am and 10am. High near 38. Breezy, with a southeast wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 5 inches possible.

    High: 38 °F

    Heavy Snow
    and Dense
    Freezing Fog

  • Thursday Night

    Thursday Night: Snow. Areas of fog between 3am and 5am. Areas of freezing fog after 5am. Low around 30. Breezy, with a south wind around 20 mph, with gusts as high as 35 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

    Low: 30 °F

    Snow and
    Areas
    Freezing Fog

  • Friday

    Friday: Snow. Areas of fog between 8am and 9am. Areas of freezing fog before 8am. High near 37. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

    High: 37 °F

    Snow and
    Areas
    Freezing Fog

  • Friday Night

    Friday Night: A 40 percent chance of snow. Partly cloudy, with a low around 17. West wind around 10 mph. New snow accumulation of less than a half inch possible.

    Low: 17 °F

    Chance Snow

  • Saturday

    Saturday: Sunny, with a high near 35.

    High: 35 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 14.

    Low: 14 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Rain and snow. Snow level 7600 feet. High near 40. Southeast wind around 15 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Tonight
Rain and snow likely before 7pm, then snow. Areas of freezing fog after 3am. Low around 29. Breezy, with a southeast wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Christmas Day
Snow, mainly after 7am. The snow could be heavy at times. Widespread dense fog, mainly between 10am and 11am. Widespread dense freezing fog between 7am and 10am. High near 38. Breezy, with a southeast wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 5 inches possible.
Thursday Night
Snow. Areas of fog between 3am and 5am. Areas of freezing fog after 5am. Low around 30. Breezy, with a south wind around 20 mph, with gusts as high as 35 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.
Friday
Snow. Areas of fog between 8am and 9am. Areas of freezing fog before 8am. High near 37. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.
Friday Night
A 40 percent chance of snow. Partly cloudy, with a low around 17. West wind around 10 mph. New snow accumulation of less than a half inch possible.
Saturday
Sunny, with a high near 35.
Saturday Night
Mostly clear, with a low around 14.
Sunday
Sunny, with a high near 38.
Sunday Night
Mostly clear, with a low around 17.
Monday
Sunny, with a high near 43.
Monday Night
Mostly clear, with a low around 23.
Tuesday
Sunny, with a high near 46.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
15 Miles W Chalfant CA
 37.55°N 118.63°W (Elev. 7014 ft)
Last Update:
1:15 pm PST Dec 24, 2025
Forecast Valid:
2pm PST Dec 24, 2025-6pm PST Dec 30, 2025
 
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