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

Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Hazardous Weather Conditions

Current conditions at

Harlan, Harlan Municipal Airport (KHNR)

Lat: 41.58°NLon: 95.34°WElev: 1230ft.

Mostly Cloudy and Windy

39°F

4°C

Humidity 75%
Wind Speed NW 33 G 39 mph
Barometer 29.62 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 10 Dec 12:15 am CST
Extended Forecast for

Portsmouth IA

High Wind Warning until December 10, 08:00am
Click here for hazard details and duration
High Wind Warning
  •  
    High Wind Warning until December 10, 08:00am

    NOW until 8:00am Wed

    High Wind Warning

  • Overnight

    Low: 26 °F

    Mostly Cloudy
    and Windy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature falling to around 25 by 5pm. Windy, with a northwest wind 24 to 29 mph decreasing to 13 to 18 mph in the afternoon. Winds could gust as high as 48 mph.

    High: 28 °F⇓

    Mostly Cloudy
    and Windy
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 17. North northwest wind around 6 mph becoming calm.

    Low: 17 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of snow between noon and 3pm, then a slight chance of freezing rain after 3pm. Mostly cloudy, with a high near 32. South southeast wind 5 to 9 mph. Chance of precipitation is 20%.

    High: 32 °F

    Mostly Cloudy
    then Slight
    Chance Wintry
    Mix

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 19. Southeast wind 6 to 11 mph becoming north northwest after midnight. Winds could gust as high as 18 mph.

    Low: 19 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 24. North northwest wind 11 to 15 mph, with gusts as high as 23 mph.

    High: 24 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of snow after midnight. Cloudy, with a low around 7. North wind 5 to 10 mph, with gusts as high as 17 mph.

    Low: 7 °F

    Cloudy then
    Slight Chance
    Snow

  • Saturday

    Saturday: A chance of snow before noon. Mostly cloudy, with a high near 13. North wind 5 to 8 mph.

    High: 13 °F

    Chance Snow
    then Mostly
    Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 26. Windy, with a northwest wind 28 to 34 mph, with gusts as high as 60 mph.
Wednesday
Mostly cloudy, with a temperature falling to around 25 by 5pm. Windy, with a northwest wind 24 to 29 mph decreasing to 13 to 18 mph in the afternoon. Winds could gust as high as 48 mph.
Wednesday Night
Mostly cloudy, with a low around 17. North northwest wind around 6 mph becoming calm.
Thursday
A slight chance of snow between noon and 3pm, then a slight chance of freezing rain after 3pm. Mostly cloudy, with a high near 32. South southeast wind 5 to 9 mph. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, with a low around 19. Southeast wind 6 to 11 mph becoming north northwest after midnight. Winds could gust as high as 18 mph.
Friday
Mostly cloudy, with a high near 24. North northwest wind 11 to 15 mph, with gusts as high as 23 mph.
Friday Night
A 20 percent chance of snow after midnight. Cloudy, with a low around 7. North wind 5 to 10 mph, with gusts as high as 17 mph.
Saturday
A chance of snow before noon. Mostly cloudy, with a high near 13. North wind 5 to 8 mph.
Saturday Night
Partly cloudy, with a low around -6. North wind around 6 mph.
Sunday
Mostly sunny, with a high near 15. Northeast wind 5 to 10 mph becoming south southeast in the afternoon. Winds could gust as high as 16 mph.
Sunday Night
Partly cloudy, with a low around 7. South southeast wind around 9 mph, with gusts as high as 16 mph.
Monday
Mostly sunny, with a high near 32. South wind 7 to 10 mph becoming north in the afternoon. Winds could gust as high as 16 mph.
Monday Night
Partly cloudy, with a low around 13. North wind around 6 mph becoming light and variable.
Tuesday
Partly sunny, with a high near 35. South wind 5 to 10 mph, with gusts as high as 17 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth IA
 41.65°N 95.5°W (Elev. 1319 ft)
Last Update:
12:35 am CST Dec 10, 2025
Forecast Valid:
12am CST Dec 10, 2025-6pm CST Dec 16, 2025
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation