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

Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Hazardous Weather Conditions

Current conditions at

CANYON CREEK (CYFW1)

Lat: 45.92944°NLon: 122.20278°WElev: 2592.0ft.

NA

43°F

6°C

Humidity 100%
Wind Speed SSE 3 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Last update 07 Dec 08:52 PM PST
Extended Forecast for

Mount St Helens WA

Flood Watch December 8, 04:00am until December 12, 04:00am
Click here for hazard details and duration
Flood Watch

  • Tonight

    Tonight: Snow showers likely, mainly before midnight. Mostly cloudy, with a low around 31. Breezy, with a west southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than one inch possible.

    Low: 31 °F

    Snow Showers
    Likely and
    Breezy

  • Monday

    Monday: Rain and snow showers before 8am, then rain, possibly mixed with snow showers between 8am and 9am, then rain after 9am. The rain and snow could be heavy at times. Snow level 7300 feet rising to 8200 feet in the afternoon. High near 37. Very windy, with a southwest wind 23 to 31 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

    High: 37 °F

    Rain/Snow and
    Windy then
    Heavy Rain
    and Very
    Windy

  • Monday Night

    Monday Night: Snow, possibly mixed with rain. The rain and snow could be heavy at times. Snow level 7700 feet lowering to 6100 feet after midnight . Low around 30. Very windy, with a southwest wind 29 to 36 mph, with gusts as high as 50 mph. Chance of precipitation is 100%. New snow accumulation of 2 to 4 inches possible.

    Low: 30 °F

    Rain/Snow and
    Very Windy

  • Tuesday

    Tuesday: Snow before 1pm, then snow, possibly mixed with rain. The snow could be heavy at times. High near 39. West southwest wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New snow accumulation of 4 to 8 inches possible.

    High: 39 °F

    Heavy Snow
    then
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain and snow before 7pm, then rain between 7pm and 1am, then rain, possibly mixed with snow after 1am. The rain could be heavy at times. Snow level 7900 feet. Low around 35. Very windy, with a west southwest wind 22 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.

    Low: 35 °F

    Rain/Snow and
    Very Windy

  • Wednesday

    Wednesday: Rain and snow. The rain could be heavy at times. Snow level 7100 feet. High near 40. Windy. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 40 °F

    Rain/Snow and
    Windy

  • Wednesday Night

    Wednesday Night: Rain, possibly mixed with snow. The rain could be heavy at times. Snow level 7300 feet. Low around 36. Breezy. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    Low: 36 °F

    Rain/Snow and
    Breezy

  • Thursday

    Thursday: Rain, possibly mixed with snow. Snow level 7700 feet. Mostly cloudy, with a high near 39.

    High: 39 °F

    Rain/Snow

  • Thursday Night

    Thursday Night: Rain likely, possibly mixed with snow, mainly before 10pm. Snow level 7500 feet. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Rain/Snow
    Likely

Detailed Forecast

Tonight
Snow showers likely, mainly before midnight. Mostly cloudy, with a low around 31. Breezy, with a west southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than one inch possible.
Monday
Rain and snow showers before 8am, then rain, possibly mixed with snow showers between 8am and 9am, then rain after 9am. The rain and snow could be heavy at times. Snow level 7300 feet rising to 8200 feet in the afternoon. High near 37. Very windy, with a southwest wind 23 to 31 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Monday Night
Snow, possibly mixed with rain. The rain and snow could be heavy at times. Snow level 7700 feet lowering to 6100 feet after midnight . Low around 30. Very windy, with a southwest wind 29 to 36 mph, with gusts as high as 50 mph. Chance of precipitation is 100%. New snow accumulation of 2 to 4 inches possible.
Tuesday
Snow before 1pm, then snow, possibly mixed with rain. The snow could be heavy at times. High near 39. West southwest wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New snow accumulation of 4 to 8 inches possible.
Tuesday Night
Rain and snow before 7pm, then rain between 7pm and 1am, then rain, possibly mixed with snow after 1am. The rain could be heavy at times. Snow level 7900 feet. Low around 35. Very windy, with a west southwest wind 22 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Wednesday
Rain and snow. The rain could be heavy at times. Snow level 7100 feet. High near 40. Windy. Chance of precipitation is 100%. Little or no snow accumulation expected.
Wednesday Night
Rain, possibly mixed with snow. The rain could be heavy at times. Snow level 7300 feet. Low around 36. Breezy. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Thursday
Rain, possibly mixed with snow. Snow level 7700 feet. Mostly cloudy, with a high near 39.
Thursday Night
Rain likely, possibly mixed with snow, mainly before 10pm. Snow level 7500 feet. Mostly cloudy, with a low around 38.
Friday
A chance of rain. Snow level 7100 feet. Mostly cloudy, with a high near 39.
Friday Night
A chance of rain and snow. Snow level 6800 feet. Mostly cloudy, with a low around 33.
Saturday
Rain and snow likely. Snow level 6400 feet. Mostly cloudy, with a high near 37.
Saturday Night
Rain and snow likely. Mostly cloudy, with a low around 34. Breezy.
Sunday
Snow likely. Mostly cloudy, with a high near 34.
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ABOUT THIS FORECAST

 
Point Forecast:
Mount St Helens WA
 46.2°N 122.18°W (Elev. 5997 ft)
Last Update:
8:41 pm PST Dec 7, 2025
Forecast Valid:
9pm PST Dec 7, 2025-6pm PST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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