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 84%
Wind Speed N 0 MPH
Barometer 30.42 in (1030.14 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 19 Jan 11:55 PM PST
Extended Forecast for

Prosser WA

Air Stagnation Advisory January 20, 12:03am until January 20, 04:00pm
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory January 20, 12:03am until January 20, 04:00pm

    NOW until 4:00pm Tue

    Air Stagnation Advisory

  • Overnight

    Low: 24 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 38. Northwest wind around 6 mph.

    High: 38 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Patchy freezing fog after 1am. Partly cloudy, with a low around 23. Calm wind.

    Low: 23 °F

    Mostly Clear
    then Patchy
    Freezing Fog

  • Wednesday

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

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 4am. Patchy freezing fog after 10pm.  Otherwise, partly cloudy, with a low around 23. Calm wind.

    Low: 23 °F

    Patchy
    Freezing Fog
    and Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 7am.  Otherwise, partly sunny, with a high near 38.

    High: 38 °F

    Patchy Fog
    then Partly
    Sunny

  • Thursday Night

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

    Low: 24 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

Detailed Forecast

Overnight
Mostly cloudy, with a low around 24. Calm wind.
Tuesday
Partly sunny, with a high near 38. Northwest wind around 6 mph.
Tuesday Night
Patchy freezing fog after 1am. Partly cloudy, with a low around 23. Calm wind.
Wednesday
Mostly sunny, with a high near 37. Light north wind.
Wednesday Night
Patchy fog after 4am. Patchy freezing fog after 10pm. Otherwise, partly cloudy, with a low around 23. Calm wind.
Thursday
Patchy fog before 7am. Otherwise, partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 24.
Friday
Mostly sunny, with a high near 39.
Friday Night
Mostly clear, with a low around 23.
Saturday
Mostly 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
Partly sunny, with a high near 45.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.2°N 119.78°W (Elev. 646 ft)
9:57 pm PST Jan 19, 2026
12am PST Jan 20, 2026-6pm PST Jan 26, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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