National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Lake Effect Snow Downwind of Lakes Erie and Ontario; Fire Weather Concerns in the Southern Plains and Southeast

A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. There is increasing confidence in snow squalls causing bursts of snow & gusty winds on New Year's Eve. Elevated fire weather conditions will continue today over parts of the Southern Plains and across much of the Southeast U.S. Read More >

Hazardous Weather Conditions

Current conditions at

Sunnyside Municipal Airport (K1S5)

Lat: 46.3271°NLon: 119.9704°WElev: 768.0ft.

Clear

23°F

-5°C

Humidity 92%
Wind Speed N 0 MPH
Barometer 30.55 in (1034.54 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 30 Dec 05:35 AM PST
Extended Forecast for

Prosser WA

Air Stagnation Advisory until January 1, 12:00pm
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory until January 1, 12:00pm

    NOW until 12:00pm Thu

    Air Stagnation Advisory

  • Overnight

    Low: 23 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 40. West wind 3 to 5 mph.

    High: 40 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 23. Calm wind.

    Low: 23 °F

    Mostly Clear

  • Wednesday

    Wednesday: Partly sunny, with a high near 35. Calm wind.

    High: 35 °F

    Partly Sunny

  • Wednesday Night

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

    Low: 24 °F

    Mostly Cloudy

  • New Year's Day

    New Year's Day: A slight chance of rain and snow. Cloudy, with a high near 35. Chance of precipitation is 20%.

    High: 35 °F

    Slight Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: A 50 percent chance of rain. Cloudy, with a low around 28.

    Low: 28 °F

    Chance Rain

  • Friday

    Friday: A 40 percent chance of rain. Mostly cloudy, with a high near 40.

    High: 40 °F

    Chance Rain

Detailed Forecast

Overnight
Partly cloudy, with a low around 23. Light west wind.
Tuesday
Mostly sunny, with a high near 40. West wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 23. Calm wind.
Wednesday
Partly sunny, with a high near 35. Calm wind.
Wednesday Night
Mostly cloudy, with a low around 24. Calm wind.
New Year's Day
A slight chance of rain and snow. Cloudy, with a high near 35. Chance of precipitation is 20%.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 28.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 40.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 31.
Saturday
A chance of rain, mainly before 10am. Partly sunny, with a high near 47.
Saturday Night
A slight chance of rain. Mostly cloudy, with a low around 32.
Sunday
Partly sunny, with a high near 45.
Sunday Night
A slight chance of rain. Mostly cloudy, with a low around 30.
Monday
A slight chance of rain and snow. Mostly cloudy, with a high near 44.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.2°N 119.78°W (Elev. 646 ft)
Last Update:
4:20 am PST Dec 30, 2025
Forecast Valid:
5am PST Dec 30, 2025-6pm PST Jan 5, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation