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 85%
Wind Speed N 0 MPH
Barometer 30.46 in (1031.49 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 19 Jan 09:35 PM PST
Extended Forecast for

11 Miles SSW Mattawa WA

Air Stagnation Advisory January 19, 09:47pm until January 20, 04:00pm
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory January 19, 09:47pm until January 20, 04:00pm

    NOW until 4:00pm Tue

    Air Stagnation Advisory

  • Tonight

    Low: 27 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 33. North wind 5 to 7 mph.

    High: 33 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 24. Northwest wind 3 to 5 mph.

    Low: 24 °F

    Mostly Clear

  • Wednesday

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

    High: 32 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 24. Northwest wind 3 to 5 mph.

    Low: 24 °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 25.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 33.

    High: 33 °F

    Sunny

Detailed Forecast

Tonight
Mostly cloudy, with a steady temperature around 27. Northwest wind around 6 mph.
Tuesday
Partly sunny, with a high near 33. North wind 5 to 7 mph.
Tuesday Night
Mostly clear, with a low around 24. Northwest wind 3 to 5 mph.
Wednesday
Sunny, with a high near 32. North wind around 6 mph.
Wednesday Night
Partly cloudy, with a low around 24. Northwest wind 3 to 5 mph.
Thursday
Partly sunny, with a high near 32.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Sunny, with a high near 33.
Friday Night
Mostly clear, with a low around 23.
Saturday
Mostly sunny, with a high near 31.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
A slight chance of snow. Partly sunny, with a high near 34.
Sunday Night
A slight chance of snow. Mostly cloudy, with a low around 29.
Monday
Partly sunny, with a high near 38.
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)
9:41 pm PST Jan 19, 2026
9pm PST Jan 19, 2026-6pm PST Jan 26, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database