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 30.4 in (1029.46 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 20 Jan 12:35 AM PST
Extended Forecast for

5 Miles SSW Toppenish WA

Air Stagnation Advisory January 20, 12:50am until January 20, 04:00pm
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory January 20, 12:50am until January 20, 04:00pm

    NOW until 4:00pm Tue

    Air Stagnation Advisory

  • Overnight

    Low: 27 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 38. Calm wind.

    High: 38 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 23. Calm wind.

    Low: 23 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37. Calm wind.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 23. Calm wind.

    Low: 23 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 38.

    High: 38 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 40.

    High: 40 °F

    Sunny

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 27. Calm wind.
Tuesday
Partly sunny, with a high near 38. Calm wind.
Tuesday Night
Partly cloudy, with a low around 23. Calm wind.
Wednesday
Mostly sunny, with a high near 37. Calm wind.
Wednesday Night
Partly cloudy, with a low around 23. Calm wind.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 23.
Friday
Sunny, with a high near 40.
Friday Night
Mostly clear, with a low around 23.
Saturday
Partly sunny, with a high near 39.
Saturday Night
Mostly cloudy, with a low around 26.
Sunday
A slight chance of rain and snow. Partly sunny, with a high near 41.
Sunday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 29.
Monday
Mostly cloudy, with a high near 44.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSW Toppenish WA
 46.3°N 120.34°W (Elev. 778 ft)
12:46 am PST Jan 20, 2026
12am 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