Dangerous, Heat Wave Persists in the Eastern U.S.; Severe Weather Expected in the Central Plains and Mid-Atlantic

A prolonged, dangerous heat wave will persist through the Independence Day weekend across the Ohio Valley, Mid-South, and East Coast. Severe thunderstorms are expected to produce damaging wind gusts from the Upper Ohio Valley into the Mid Atlantic, and across the central Great Plains this afternoon and evening. Large hail and heavy rain is also possible across the Great Plains. Read More >

Current conditions at

Carroll County Regional Jack B Poage Field (KDMW)

Lat: 39.61°NLon: 77.01°WElev: 789ft.

Fair

84°F

29°C

Humidity 55%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 4 Jul 8:15 am EDT
Extended Forecast for

4 Miles S Unionville MD

Extreme Heat Warning July 4, 10:00am until July 4, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  • Independence Day

    Independence Day: Isolated showers and thunderstorms after 2pm.  Increasing clouds and hot, with a high near 98. Heat index values as high as 110. Calm wind becoming west 5 to 7 mph in the afternoon.  Chance of precipitation is 20%.

    High: 98 °F

    Sunny then
    Isolated
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 2am.  Mostly cloudy, with a low around 72. Light and variable wind.  Chance of precipitation is 50%.

    Low: 72 °F

    Scattered
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms between 3pm and 5pm, then showers likely and possibly a thunderstorm after 5pm.  Mostly sunny, with a high near 89. Light and variable wind.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Mostly Sunny
    then Showers
    Likely

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 5am, then showers likely.  Low around 69. East wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 69 °F

    Showers

  • Monday

    Monday: Showers likely, then showers and possibly a thunderstorm after 11am.  High near 81. Light east wind.  Chance of precipitation is 80%.

    High: 81 °F

    Showers
    Likely then
    T-storms

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers.  Low around 67. Chance of precipitation is 80%.

    Low: 67 °F

    T-storms then
    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 2pm.  Mostly cloudy, with a high near 81. Chance of precipitation is 50%.

    High: 81 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 66. Chance of precipitation is 40%.

    Low: 66 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm.  Partly sunny, with a high near 83. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers

Detailed Forecast

Independence Day
Isolated showers and thunderstorms after 2pm. Increasing clouds and hot, with a high near 98. Heat index values as high as 110. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 20%.
Tonight
Scattered showers and thunderstorms, mainly before 2am. Mostly cloudy, with a low around 72. Light and variable wind. Chance of precipitation is 50%.
Sunday
A chance of showers and thunderstorms between 3pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly sunny, with a high near 89. Light and variable wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm before 5am, then showers likely. Low around 69. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers likely, then showers and possibly a thunderstorm after 11am. High near 81. Light east wind. Chance of precipitation is 80%.
Monday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 67. Chance of precipitation is 80%.
Tuesday
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 50%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Unionville MD
 39.46°N 77.13°W (Elev. 787 ft)
7:53 am EDT Jul 4, 2026
8am EDT Jul 4, 2026-6pm EDT Jul 10, 2026
 
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Additional Resources

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