Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

Grand Coulee Dam Airport (K3W7)

Lat: 47.92205°NLon: 119.083°WElev: 1593.0ft.

Overcast

28°F

-2°C

Humidity 86%
Wind Speed NNE 3 MPH
Barometer 30.36 in (1028.11 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 20 Jan 03:35 AM PST
Extended Forecast for

Grand Coulee WA

Air Stagnation Advisory January 20, 03:57am until January 20, 04:00pm
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory January 20, 03:57am until January 20, 04:00pm

    NOW until 4:00pm Tue

    Air Stagnation Advisory

  • Overnight

    Low: 28 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 38. Southwest wind 3 to 5 mph.

    High: 38 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 26. Calm wind.

    Low: 26 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly sunny, with a high near 36. Light northeast wind.

    High: 36 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 27. Calm wind.

    Low: 27 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 38.

    High: 38 °F

    Sunny

Detailed Forecast

Overnight
Mostly cloudy, with a low around 28. East wind around 5 mph.
Tuesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 38. Southwest wind 3 to 5 mph.
Tuesday Night
Increasing clouds, with a low around 26. Calm wind.
Wednesday
Mostly sunny, with a high near 36. Light northeast wind.
Wednesday Night
Mostly cloudy, with a low around 27. Calm wind.
Thursday
Partly sunny, with a high near 37.
Thursday Night
Partly cloudy, with a low around 26.
Friday
Sunny, with a high near 38.
Friday Night
Mostly clear, with a low around 24.
Saturday
Mostly sunny, with a high near 35.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
A 20 percent chance of snow. Partly sunny, with a high near 36.
Sunday Night
Mostly cloudy, with a low around 28.
Monday
Partly sunny, with a high near 39.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Coulee WA
 47.94°N 119.02°W (Elev. 1601 ft)
1:12 am PST Jan 20, 2026
3am PST Jan 20, 2026-6pm PST Jan 26, 2026
 
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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