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.

NA

29°F

-2°C

Humidity 96%
Wind Speed N 0 MPH
Barometer 29.57 in (1001.36 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 25 Dec 03:56 AM PST
Extended Forecast for

2 Miles E 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

  • Overnight

    Overnight: A chance of rain and snow. Mostly cloudy, with a low around 28. East wind around 10 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

    Low: 28 °F

    Chance
    Rain/Snow

  • Christmas Day

    Christmas Day: Rain and snow, mainly between 10am and 4pm. Patchy fog after 4pm. High near 38. Southeast wind 5 to 7 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 38 °F

    Rain/Snow and
    Patchy Fog

  • Thursday Night

    Thursday Night: Rain and snow likely before 10pm, then a chance of rain between 10pm and 1am, then a chance of rain and snow after 1am. Patchy 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
    Patchy Fog

  • Friday

    Friday: Snow, mainly after 7am. The snow could be heavy at times. Patchy fog before 10am. High near 36. Calm wind becoming southwest 5 to 8 mph in the morning. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

    High: 36 °F

    Heavy Snow
    and Patchy
    Fog

  • Friday Night

    Friday Night: Snow, mainly before 4am. The snow could be heavy at times. Low around 24. West wind 7 to 9 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.

    Low: 24 °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.

    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 20.

    Low: 20 °F

    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 1pm, then patchy fog after 4pm. Otherwise, partly sunny, with a high near 34.

    High: 34 °F

    Patchy Fog

  • Sunday Night

    Sunday Night: Patchy fog before 10pm. Otherwise, mostly cloudy, with a low around 25.

    Low: 25 °F

    Patchy Fog
    then Mostly
    Cloudy

Detailed Forecast

Overnight
A chance of rain and snow. Mostly cloudy, with a low around 28. East wind around 10 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Christmas Day
Rain and snow, mainly between 10am and 4pm. Patchy fog after 4pm. High near 38. Southeast wind 5 to 7 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Thursday Night
Rain and snow likely before 10pm, then a chance of rain between 10pm and 1am, then a chance of rain and snow after 1am. Patchy 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. Patchy fog before 10am. High near 36. Calm wind becoming southwest 5 to 8 mph in the morning. 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 24. West wind 7 to 9 mph, with gusts as high as 24 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.
Saturday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 20.
Sunday
Patchy fog before 1pm, then patchy fog after 4pm. Otherwise, partly sunny, with a high near 34.
Sunday Night
Patchy fog before 10pm. Otherwise, mostly cloudy, with a low around 25.
Monday
Mostly cloudy, with a high near 39.
Monday Night
Mostly cloudy, with a low around 28.
Tuesday
Mostly cloudy, with a high near 41.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 31.
Wednesday
A chance of rain and snow. Mostly cloudy, with a high near 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E Snoqualmie Pass WA
 47.41°N 121.37°W (Elev. 2628 ft)
Last Update:
4:20 am PST Dec 25, 2025
Forecast Valid:
4am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
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Additional Resources

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Chance of Precipitation