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

32°F

0°C

Humidity 86%
Wind Speed W 5 MPH
Barometer 30.56 in (1034.88 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 18 Jan 07:55 PM PST
Extended Forecast for

Prosser WA

Air Stagnation Advisory January 18, 08:11pm until January 20, 04:00pm
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory January 18, 08:11pm until January 20, 04:00pm

    NOW until 4:00pm Tue

    Air Stagnation Advisory

  • Tonight

    Low: 26 °F

    Cloudy

  • M.L.King Day

    M.L.King Day: Mostly cloudy, with a high near 39. Calm wind.

    High: 39 °F

    Mostly Cloudy

  • Monday Night

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

    Low: 25 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 39. North wind around 6 mph.

    High: 39 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Patchy freezing fog after 1am. Partly cloudy, with a low around 25. Calm wind.

    Low: 25 °F

    Partly Cloudy
    then Patchy
    Freezing Fog

  • Wednesday

    Wednesday: Partly sunny, with a high near 38.

    High: 38 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

Detailed Forecast

Tonight
Cloudy, with a low around 26. Calm wind.
M.L.King Day
Mostly cloudy, with a high near 39. Calm wind.
Monday Night
Mostly cloudy, with a low around 25. Calm wind.
Tuesday
Partly sunny, with a high near 39. North wind around 6 mph.
Tuesday Night
Patchy freezing fog after 1am. Partly cloudy, with a low around 25. Calm wind.
Wednesday
Partly sunny, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 24.
Thursday
Partly sunny, with a high near 39.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 41.
Friday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 27.
Saturday
A slight chance of rain and snow. Snow level 1800 feet. Partly sunny, with a high near 40.
Saturday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 25.
Sunday
A slight chance of rain and snow. Partly sunny, with a high near 42.
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ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.21°N 119.75°W (Elev. 741 ft)
3:20 pm PST Jan 18, 2026
8pm PST Jan 18, 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