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

79°F

26°C

Humidity 30%
Wind Speed S 18 G 30 mph
Barometer 29.77 in
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 16 Apr 1:35 pm CDT
Extended Forecast for

Portsmouth IA

  • This Afternoon

    This Afternoon: Sunny, with a high near 82. South southwest wind 15 to 17 mph, with gusts as high as 23 mph.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 55. South wind 11 to 17 mph, with gusts as high as 28 mph.

    Low: 55 °F

    Increasing
    Clouds

  • Friday

    Friday: A slight chance of showers and thunderstorms before noon, then a slight chance of showers after 2pm. Cloudy, then gradually becoming mostly sunny, with a temperature rising to near 68 by 10am, then falling to around 58 during the remainder of the day. Breezy, with a south wind 18 to 22 mph becoming north northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 20%.

    High: 68 °F⇓

    Breezy.
    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers. Partly cloudy, with a low around 30. Blustery, with a north northwest wind 16 to 21 mph, with gusts as high as 30 mph.

    Low: 30 °F

    Slight Chance
    Showers and
    Blustery

  • Saturday

    Saturday: Sunny, with a high near 52. Breezy, with a northwest wind 14 to 18 mph, with gusts as high as 29 mph.

    High: 52 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 31. Northwest wind 9 to 14 mph becoming light west northwest after midnight. Winds could gust as high as 22 mph.

    Low: 31 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 62. Light west wind becoming west northwest 5 to 9 mph in the morning.

    High: 62 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38. Northeast wind 5 to 10 mph becoming east southeast after midnight. Winds could gust as high as 17 mph.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 74. South wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 74 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 82. South southwest wind 15 to 17 mph, with gusts as high as 23 mph.
Tonight
Increasing clouds, with a low around 55. South wind 11 to 17 mph, with gusts as high as 28 mph.
Friday
A slight chance of showers and thunderstorms before noon, then a slight chance of showers after 2pm. Cloudy, then gradually becoming mostly sunny, with a temperature rising to near 68 by 10am, then falling to around 58 during the remainder of the day. Breezy, with a south wind 18 to 22 mph becoming north northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 20%.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 30. Blustery, with a north northwest wind 16 to 21 mph, with gusts as high as 30 mph.
Saturday
Sunny, with a high near 52. Breezy, with a northwest wind 14 to 18 mph, with gusts as high as 29 mph.
Saturday Night
Mostly clear, with a low around 31. Northwest wind 9 to 14 mph becoming light west northwest after midnight. Winds could gust as high as 22 mph.
Sunday
Sunny, with a high near 62. Light west wind becoming west northwest 5 to 9 mph in the morning.
Sunday Night
Mostly clear, with a low around 38. Northeast wind 5 to 10 mph becoming east southeast after midnight. Winds could gust as high as 17 mph.
Monday
Sunny, with a high near 74. South wind 10 to 17 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 50. South wind 13 to 15 mph, with gusts as high as 22 mph.
Tuesday
Sunny, with a high near 77. Southwest wind 11 to 13 mph, with gusts as high as 18 mph.
Tuesday Night
Clear, with a low around 49. East southeast wind 8 to 10 mph.
Wednesday
Sunny, with a high near 78. South southeast wind 8 to 16 mph, with gusts as high as 24 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:
1:35 pm CDT Apr 16, 2026
Forecast Valid:
1pm CDT Apr 16, 2026-6pm CDT Apr 22, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation