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

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Hazardous Weather Conditions

Current conditions at

Harlan, Harlan Municipal Airport (KHNR)

Lat: 41.58°NLon: 95.34°WElev: 1230ft.

Overcast

27°F

-3°C

Humidity 86%
Wind Speed Calm
Barometer 29.88 in
Dewpoint 23°F (-5°C)
Visibility 9.00 mi
Last update 1 Jan 4:35 pm CST
Extended Forecast for

Portsmouth IA

  • Tonight

    Tonight: Mostly cloudy, with a low around 21. Calm wind becoming north northeast around 5 mph after midnight.

    Low: 21 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of snow after 4pm. Cloudy, with a high near 29. East wind 5 to 7 mph.

    High: 29 °F

    Cloudy then
    Slight Chance
    Snow

  • Friday Night

    Friday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 21. East wind around 6 mph becoming calm in the evening.

    Low: 21 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 38. Calm wind becoming west southwest around 6 mph.

    High: 38 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 24. Calm wind becoming southeast around 5 mph after midnight.

    Low: 24 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 44. South southeast wind 6 to 16 mph, with gusts as high as 25 mph.

    High: 44 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 31. South wind 9 to 14 mph becoming light and variable after midnight. Winds could gust as high as 22 mph.

    Low: 31 °F

    Mostly Clear

  • Monday

    Monday: Partly sunny, with a high near 50. Calm wind becoming south around 6 mph in the afternoon.

    High: 50 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 33. South southeast wind around 5 mph becoming light and variable.

    Low: 33 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 21. Calm wind becoming north northeast around 5 mph after midnight.
Friday
A 20 percent chance of snow after 4pm. Cloudy, with a high near 29. East wind 5 to 7 mph.
Friday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 21. East wind around 6 mph becoming calm in the evening.
Saturday
Sunny, with a high near 38. Calm wind becoming west southwest around 6 mph.
Saturday Night
Partly cloudy, with a low around 24. Calm wind becoming southeast around 5 mph after midnight.
Sunday
Mostly cloudy, with a high near 44. South southeast wind 6 to 16 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 31. South wind 9 to 14 mph becoming light and variable after midnight. Winds could gust as high as 22 mph.
Monday
Partly sunny, with a high near 50. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 33. South southeast wind around 5 mph becoming light and variable.
Tuesday
Mostly sunny, with a high near 49. Northwest wind 5 to 11 mph, with gusts as high as 16 mph.
Tuesday Night
Mostly clear, with a low around 29. West northwest wind around 6 mph becoming light and variable.
Wednesday
Sunny, with a high near 50. South southwest wind 5 to 9 mph, with gusts as high as 16 mph.
Wednesday Night
Partly cloudy, with a low around 31. South wind around 6 mph.
Thursday
A slight chance of rain. Partly sunny, with a high near 47. South southeast wind 6 to 10 mph, with gusts as high as 17 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth IA
 41.65°N 95.5°W (Elev. 1319 ft)
Last Update:
4:46 pm CST Jan 1, 2026
Forecast Valid:
4pm CST Jan 1, 2026-6pm CST Jan 8, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation