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 87%
Wind Speed W 4 MPH
Barometer 30.6 in (1036.24 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 19 Jan 03:35 AM PST
Extended Forecast for

Prosser WA

Air Stagnation Advisory January 19, 03:50am until January 20, 04:00pm
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory January 19, 03:50am until January 20, 04:00pm

    NOW until 4:00pm Tue

    Air Stagnation Advisory

  • Overnight

    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: Patchy freezing fog between 10pm and 1am. Mostly cloudy, with a low around 24. Calm wind.

    Low: 24 °F

    Patchy
    Freezing Fog

  • 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 24. Calm wind.

    Low: 24 °F

    Partly Cloudy
    then Patchy
    Freezing Fog

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after 4am. Patchy freezing fog after 10pm.  Otherwise, mostly cloudy, with a low around 24.

    Low: 24 °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

Detailed Forecast

Overnight
Cloudy, with a low around 26. Calm wind.
M.L.King Day
Mostly cloudy, with a high near 39. Calm wind.
Monday Night
Patchy freezing fog between 10pm and 1am. 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 24. Calm wind.
Wednesday
Mostly sunny, with a high near 37.
Wednesday Night
Patchy fog after 4am. Patchy freezing fog after 10pm. Otherwise, mostly cloudy, with a low around 24.
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
Partly cloudy, with a low around 24.
Saturday
Mostly sunny, with a high near 40.
Saturday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 27.
Sunday
A slight chance of rain and snow. Mostly cloudy, with a high near 42.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.2°N 119.78°W (Elev. 646 ft)
3:26 am PST Jan 19, 2026
3am PST Jan 19, 2026-6pm PST Jan 25, 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