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

Stampede Pass (KSMP)

Lat: 47.27648°NLon: 121.33817°WElev: 3970.0ft.

unknown precip,freezing fog

31°F

-1°C

Humidity 100%
Wind Speed ENE 3 MPH
Barometer 29.55 in (1000.68 mb)
Dewpoint 31°F (-1°C)
Visibility 0.50 mi
Last update 25 Dec 10:24 AM PST
Extended Forecast for

Snoqualmie Pass WA

Winter Weather Advisory December 26, 04:00am until December 27, 07:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Christmas Day

    Christmas Day: Rain, possibly mixed with snow, mainly before 4pm. Patchy fog after 1pm. High near 38. Southeast wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 38 °F

    Rain/Snow and
    Patchy Fog

  • Tonight

    Tonight: Rain and snow likely, mainly before 10pm. Areas of fog. Otherwise, mostly cloudy, with a low around 28. Calm wind. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 28 °F

    Rain/Snow
    Likely and
    Areas Fog

  • Friday

    Friday: Snow, mainly after 7am. The snow could be heavy at times. Areas of fog before 1pm. High near 35. Calm wind becoming southwest around 6 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

    High: 35 °F

    Heavy Snow
    and Areas Fog

  • Friday Night

    Friday Night: Snow, mainly before 4am. The snow could be heavy at times. Low around 25. West wind 3 to 7 mph. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.

    Low: 25 °F

    Heavy Snow
    then Snow
    Likely

  • Saturday

    Saturday: A 20 percent chance of snow before 10am. Patchy fog before 1pm. Otherwise, mostly cloudy, with a high near 29. Calm wind.

    High: 29 °F

    Slight Chance
    Snow and
    Patchy Fog
    then Patchy
    Fog

  • Saturday Night

    Saturday Night: Patchy fog. Otherwise, mostly cloudy, with a low around 21.

    Low: 21 °F

    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 10am. Otherwise, partly sunny, with a high near 34.

    High: 34 °F

    Patchy Fog
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 39.

    High: 39 °F

    Mostly Cloudy

Detailed Forecast

Christmas Day
Rain, possibly mixed with snow, mainly before 4pm. Patchy fog after 1pm. High near 38. Southeast wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 90%. Little or no snow accumulation expected.
Tonight
Rain and snow likely, mainly before 10pm. Areas of fog. Otherwise, mostly cloudy, with a low around 28. Calm wind. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday
Snow, mainly after 7am. The snow could be heavy at times. Areas of fog before 1pm. High near 35. Calm wind becoming southwest around 6 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.
Friday Night
Snow, mainly before 4am. The snow could be heavy at times. Low around 25. West wind 3 to 7 mph. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.
Saturday
A 20 percent chance of snow before 10am. Patchy fog before 1pm. Otherwise, mostly cloudy, with a high near 29. Calm wind.
Saturday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 21.
Sunday
Patchy fog before 10am. Otherwise, partly sunny, with a high near 34.
Sunday Night
Mostly cloudy, with a low around 25.
Monday
Mostly cloudy, with a high near 39.
Monday Night
Mostly cloudy, with a low around 29.
Tuesday
Mostly cloudy, with a high near 41.
Tuesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 32.
Wednesday
A chance of rain and snow. Mostly cloudy, with a high near 41.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Snoqualmie Pass WA
 47.41°N 121.41°W (Elev. 2812 ft)
Last Update:
9:51 am PST Dec 25, 2025
Forecast Valid:
10am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
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