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

30°F

-1°C

Humidity 85%
Wind Speed N 0 MPH
Barometer 30.4 in (1029.46 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 20 Jan 03:35 AM PST
Extended Forecast for

Prosser WA

Air Stagnation Advisory January 20, 03:31am until January 20, 04:00pm
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory January 20, 03:31am until January 20, 04:00pm

    NOW until 4:00pm Tue

    Air Stagnation Advisory

  • Overnight

    Low: 27 °F

    Cloudy

  • Tuesday

    Tuesday: Cloudy, with a high near 36. Northwest wind 3 to 5 mph.

    High: 36 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 25. Calm wind.

    Low: 25 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 34. Calm wind.

    High: 34 °F

    Mostly Cloudy

  • Wednesday Night

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

    Low: 23 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 35.

    High: 35 °F

    Mostly Cloudy

  • Thursday Night

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

    Low: 24 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

Detailed Forecast

Overnight
Cloudy, with a low around 27. Calm wind.
Tuesday
Cloudy, with a high near 36. Northwest wind 3 to 5 mph.
Tuesday Night
Mostly cloudy, with a low around 25. Calm wind.
Wednesday
Mostly cloudy, with a high near 34. Calm wind.
Wednesday Night
Mostly cloudy, with a low around 23. Calm wind.
Thursday
Mostly cloudy, with a high near 35.
Thursday Night
Partly cloudy, with a low around 24.
Friday
Mostly sunny, with a high near 38.
Friday Night
Mostly clear, with a low around 22.
Saturday
Mostly sunny, with a high near 36.
Saturday Night
Partly cloudy, with a low around 24.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 28.
Monday
Partly sunny, with a high near 43.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.22°N 119.79°W (Elev. 715 ft)
3:16 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