Severe Thunderstorms for the Center of the Nation; Fire Weather Concerns; Flooding Issues for the Great Lakes Region

A round of severe thunderstorms are forecast across areas of the Southern Plains, Mississippi Valley and Great Lakes this afternoon and tonight; The threat for flash flooding will also accompany these storms. The rainfall for the Great Lakes region could prolong the ongoing flooding. Where the rain is needed, the Southern High Plains, critical fire weather concerns through today. Read More >

Hazardous Weather Conditions

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Fair

58°F

14°C

Humidity 81%
Wind Speed Calm
Barometer 29.97 in (1015.6 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 18 Apr 6:53 am EDT
Extended Forecast for

3 Miles SSW Mercersburg PA

  • Today

    Today: Mostly sunny, with a high near 84. Light east wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 23 mph.

    High: 84 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers after 1am.  Low around 46. South wind 5 to 7 mph becoming light and variable. Winds could gust as high as 21 mph.  Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Showers

  • Sunday

    Sunday: Showers likely, mainly before 8am.  Cloudy through mid morning, then gradual clearing, with a high near 57. Northwest wind 11 to 14 mph, with gusts as high as 28 mph.  Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 57 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A slight chance of showers after 8pm.  Partly cloudy, with a low around 38. Northwest wind 3 to 6 mph.  Chance of precipitation is 20%.

    Low: 38 °F

    Slight Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 51. Northwest wind 8 to 11 mph, with gusts as high as 23 mph.

    High: 51 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers before 2pm.  Mostly sunny, with a high near 71. Chance of precipitation is 30%.

    High: 71 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 84. Light east wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 23 mph.
Tonight
Showers and thunderstorms likely, then showers after 1am. Low around 46. South wind 5 to 7 mph becoming light and variable. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Showers likely, mainly before 8am. Cloudy through mid morning, then gradual clearing, with a high near 57. Northwest wind 11 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
A slight chance of showers after 8pm. Partly cloudy, with a low around 38. Northwest wind 3 to 6 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 51. Northwest wind 8 to 11 mph, with gusts as high as 23 mph.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Sunny, with a high near 61.
Tuesday Night
Partly cloudy, with a low around 46.
Wednesday
A chance of showers before 2pm. Mostly sunny, with a high near 71. Chance of precipitation is 30%.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Sunny, with a high near 76.
Thursday Night
Mostly clear, with a low around 52.
Friday
Mostly sunny, with a high near 81.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Mercersburg PA
 39.78°N 77.94°W (Elev. 551 ft)
6:16 am EDT Apr 18, 2026
7am EDT Apr 18, 2026-6pm EDT Apr 24, 2026
 
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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