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

Sunnyside Municipal Airport (K1S5)

Lat: 46.3271°NLon: 119.9704°WElev: 768.0ft.

Overcast

31°F

-1°C

Humidity 88%
Wind Speed WSW 3 MPH
Barometer 30.6 in (1036.24 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 19 Jan 06:55 AM PST
Extended Forecast for

11 Miles SSW Mattawa WA

Air Stagnation Advisory January 19, 07:07am until January 20, 04:00pm
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory January 19, 07:07am until January 20, 04:00pm

    NOW until 4:00pm Tue

    Air Stagnation Advisory

  • M.L.King Day

    High: 34 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 25. Southwest wind around 6 mph.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 33. North wind 5 to 8 mph.

    High: 33 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 25. West wind 3 to 5 mph.

    Low: 25 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 32. North wind around 6 mph.

    High: 32 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 32.

    High: 32 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

Detailed Forecast

M.L.King Day
Partly sunny, with a high near 34. North wind around 5 mph becoming light and variable.
Tonight
Partly cloudy, with a low around 25. Southwest wind around 6 mph.
Tuesday
Partly sunny, with a high near 33. North wind 5 to 8 mph.
Tuesday Night
Mostly clear, with a low around 25. West wind 3 to 5 mph.
Wednesday
Mostly sunny, with a high near 32. North wind around 6 mph.
Wednesday Night
Partly cloudy, with a low around 25.
Thursday
Partly sunny, with a high near 32.
Thursday Night
Partly cloudy, with a low around 24.
Friday
Mostly sunny, with a high near 32.
Friday Night
Mostly clear, with a low around 24.
Saturday
Mostly sunny, with a high near 33.
Saturday Night
A slight chance of snow. Partly cloudy, with a low around 27.
Sunday
A slight chance of snow. Partly sunny, with a high near 34.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
11 Miles SSW Mattawa WA
 46.59°N 119.98°W (Elev. 3100 ft)
5:47 am PST Jan 19, 2026
7am PST Jan 19, 2026-6pm PST Jan 25, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database