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

Severe Thunderstorms in Portions of the Mississippi Valley and Great Lakes

A few severe thunderstorms with large hail, are expected across parts of the middle and upper Mississippi River Valley tonight through early morning. Snow and a wintry mix overnight in the Upper Midwest into the Great Lakes can cause hazardous travel conditions. Fire weather concerns continue for a large portion of the central and southern High Plains and Four Corners region this evening. Read More >

Current conditions at

Harrisburg, Capital City Airport (KCXY)

Lat: 40.22°NLon: 76.86°WElev: 335ft.

Fair

64°F

18°C

Humidity 60%
Wind Speed SW 12 G 21 mph
Barometer 30.07 in (1018.4 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 30 Mar 10:56 pm EDT
Extended Forecast for

Duncannon PA

  • Tonight

    Tonight: A slight chance of showers before 2am, then a chance of showers after 3am. Mostly cloudy, with a low around 56. South wind around 6 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 56 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Southwest wind 6 to 10 mph, with gusts as high as 22 mph.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of thunderstorms, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 62. Southwest wind around 6 mph. Chance of precipitation is 30%.

    Low: 62 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 75. Southwest wind 6 to 9 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Chance
    Showers then
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 52. North wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 52 °F

    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 69. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 69 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers after 2pm. Mostly cloudy, with a high near 76. Chance of precipitation is 40%.

    High: 76 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers before 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 30%.

    Low: 58 °F

    Chance
    Showers

Detailed Forecast

Tonight
A slight chance of showers before 2am, then a chance of showers after 3am. Mostly cloudy, with a low around 56. South wind around 6 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Mostly sunny, with a high near 77. Southwest wind 6 to 10 mph, with gusts as high as 22 mph.
Tuesday Night
A slight chance of thunderstorms, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 62. Southwest wind around 6 mph. Chance of precipitation is 30%.
Wednesday
A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 75. Southwest wind 6 to 9 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 52. North wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 69. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Mostly cloudy, with a low around 53.
Friday
A chance of showers after 2pm. Mostly cloudy, with a high near 76. Chance of precipitation is 40%.
Friday Night
A chance of showers before 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 30%.
Saturday
A chance of showers after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 50%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 58. Chance of precipitation is 50%.
Sunday
Showers likely. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.
Sunday Night
Showers likely. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Monday
A chance of showers. Mostly sunny, with a high near 58. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Duncannon PA
 40.4°N 77.02°W (Elev. 413 ft)
Last Update:
8:05 pm EDT Mar 30, 2026
Forecast Valid:
11pm EDT Mar 30, 2026-6pm EDT Apr 6, 2026
 
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