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

Sinlaku Continues to Impact the Marianas; Severe Weather for the Central Plains and Northeast; Record Warmth for mid-Atlantic to Southeast

Sinlaku continues to affect the Marianas as it moves north through Friday. Meanwhile, severe thunderstorms are expected from the Northeast to the Mid-Mississippi Valley today and for the Central/Southern Plains on Friday. Considerable flooding impacts are ongoing in the Upper Great Lakes, and expected to continue through the weekend. Fire weather concerns persist in the Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Harlan, Harlan Municipal Airport (KHNR)

Lat: 41.58°NLon: 95.34°WElev: 1230ft.

Fair

54°F

12°C

Humidity 88%
Wind Speed Calm
Barometer 29.82 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 16 Apr 8:35 am CDT
Extended Forecast for

Portsmouth IA

  • Today

    Today: Sunny, with a high near 82. South southwest wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 24 mph.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 55. South wind 11 to 16 mph, with gusts as high as 25 mph.

    Low: 55 °F

    Increasing
    Clouds

  • Friday

    Friday: A 40 percent chance of showers. Partly sunny, with a high near 72. Breezy, with a south wind 17 to 21 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 72 °F

    Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: A chance of rain showers before 4am, then a slight chance of snow showers. Partly cloudy, with a low around 32. Breezy, with a north northwest wind 15 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 32 °F

    Chance
    Showers and
    Breezy then
    Chance
    Rain/Snow

  • Saturday

    Saturday: A 10 percent chance of snow showers before 7am. Sunny, with a high near 52. Breezy, with a northwest wind 14 to 20 mph, with gusts as high as 29 mph.

    High: 52 °F

    Slight Chance
    Snow Showers
    then Sunny
    and Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 29. Northwest wind 9 to 14 mph becoming light in the evening. Winds could gust as high as 22 mph.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 63. Light west southwest wind becoming west northwest 5 to 9 mph in the morning.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38. East southeast wind 7 to 10 mph, with gusts as high as 17 mph.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 73. Breezy, with a south wind 11 to 20 mph, with gusts as high as 28 mph.

    High: 73 °F

    Sunny then
    Sunny and
    Breezy

Detailed Forecast

Today
Sunny, with a high near 82. South southwest wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 24 mph.
Tonight
Increasing clouds, with a low around 55. South wind 11 to 16 mph, with gusts as high as 25 mph.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 72. Breezy, with a south wind 17 to 21 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A chance of rain showers before 4am, then a slight chance of snow showers. Partly cloudy, with a low around 32. Breezy, with a north northwest wind 15 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 10 percent chance of snow showers before 7am. Sunny, with a high near 52. Breezy, with a northwest wind 14 to 20 mph, with gusts as high as 29 mph.
Saturday Night
Mostly clear, with a low around 29. Northwest wind 9 to 14 mph becoming light in the evening. Winds could gust as high as 22 mph.
Sunday
Sunny, with a high near 63. Light west southwest wind becoming west northwest 5 to 9 mph in the morning.
Sunday Night
Mostly clear, with a low around 38. East southeast wind 7 to 10 mph, with gusts as high as 17 mph.
Monday
Sunny, with a high near 73. Breezy, with a south wind 11 to 20 mph, with gusts as high as 28 mph.
Monday Night
Mostly clear, with a low around 49. South wind 14 to 16 mph, with gusts as high as 23 mph.
Tuesday
Sunny, with a high near 75. South southwest wind 11 to 16 mph, with gusts as high as 22 mph.
Tuesday Night
Mostly clear, with a low around 49. South wind 10 to 13 mph, with gusts as high as 18 mph.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 74. South southeast wind 10 to 17 mph, with gusts as high as 25 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:
8:01 am CDT Apr 16, 2026
Forecast Valid:
8am CDT Apr 16, 2026-6pm CDT Apr 22, 2026
 
Forecast Discussion
 
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Additional Resources

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