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

Tracking Weekend Storm Impacts

A storm and trailing cold front will continue to slowly move through the Gulf Coast and Southeast U.S. through this weekend with widespread rain showers and isolated thunderstorms. A fast-moving clipper storm may bring several inches of snow to the north-central Plains, Midwest, eastern Great Lakes, and Northeast regions this weekend. Read More >

Hazardous Weather Conditions

Current conditions at

Harlan, Harlan Municipal Airport (KHNR)

Lat: 41.58°NLon: 95.34°WElev: 1230ft.

Overcast

28°F

-2°C

Humidity 93%
Wind Speed Calm
Barometer 29.88 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 6 Dec 3:15 am CST
Extended Forecast for

Portsmouth IA

Winter Weather Advisory December 6, 09:00am until December 6, 09:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Overnight

    Overnight: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 19. Calm wind.

    Low: 19 °F

    Patchy Fog

  • Saturday

    Saturday: Snow likely before 3pm, then snow likely, possibly mixed with freezing rain between 3pm and 4pm, then snow likely after 4pm. Patchy fog before 9am. Otherwise, cloudy, with a high near 31. Light east southeast wind becoming southeast 9 to 14 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 70%. Little or no ice accumulation expected. New snow accumulation of less than a half inch possible.

    High: 31 °F

    Chance Snow
    and Patchy
    Fog then
    Wintry Mix
    Likely

  • Saturday Night

    Saturday Night: Snow likely, mainly before 9pm. Mostly cloudy, with a low around 9. Southeast wind 10 to 14 mph becoming north after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 9 °F

    Snow Likely
    then Mostly
    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 15. North wind 8 to 13 mph becoming light north northeast in the afternoon. Winds could gust as high as 21 mph.

    High: 15 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 5. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 5 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 30. South wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 30 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 21. Southwest wind 6 to 10 mph, with gusts as high as 17 mph.

    Low: 21 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 40. South southwest wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 40 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 19. Blustery, with a west southwest wind 11 to 18 mph becoming northwest after midnight. Winds could gust as high as 29 mph.

    Low: 19 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Blustery

Detailed Forecast

Overnight
Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 19. Calm wind.
Saturday
Snow likely before 3pm, then snow likely, possibly mixed with freezing rain between 3pm and 4pm, then snow likely after 4pm. Patchy fog before 9am. Otherwise, cloudy, with a high near 31. Light east southeast wind becoming southeast 9 to 14 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 70%. Little or no ice accumulation expected. New snow accumulation of less than a half inch possible.
Saturday Night
Snow likely, mainly before 9pm. Mostly cloudy, with a low around 9. Southeast wind 10 to 14 mph becoming north after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday
Mostly sunny, with a high near 15. North wind 8 to 13 mph becoming light north northeast in the afternoon. Winds could gust as high as 21 mph.
Sunday Night
Mostly cloudy, with a low around 5. Calm wind becoming south southeast around 6 mph after midnight.
Monday
Mostly sunny, with a high near 30. South wind 6 to 11 mph, with gusts as high as 18 mph.
Monday Night
Partly cloudy, with a low around 21. Southwest wind 6 to 10 mph, with gusts as high as 17 mph.
Tuesday
Mostly cloudy, with a high near 40. South southwest wind 6 to 11 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 19. Blustery, with a west southwest wind 11 to 18 mph becoming northwest after midnight. Winds could gust as high as 29 mph.
Wednesday
Partly sunny, with a high near 27. Blustery, with a northwest wind 8 to 18 mph, with gusts as high as 28 mph.
Wednesday Night
A slight chance of snow. Mostly cloudy, with a low around 15. North wind around 8 mph becoming east in the evening.
Thursday
Mostly cloudy, with a high near 25. East wind 8 to 11 mph becoming west northwest in the morning. Winds could gust as high as 17 mph.
Thursday Night
Mostly cloudy, with a low around 8. North northwest wind 7 to 9 mph.
Friday
Partly sunny, with a high near 16. Northwest wind 8 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:
3:16 am CST Dec 6, 2025
Forecast Valid:
3am CST Dec 6, 2025-6pm CST Dec 12, 2025
 
Forecast Discussion
 
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Additional Resources

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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