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

Dangerous Heat in the Central and Eastern U.S.; Severe Thunderstorms in the Central U.S. and Northeast; Critical Fire Weather in the Four Corners

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Severe thunderstorms are forecast from parts of the central High Plains into the Upper Midwest, and across parts of the Northeast. Critical fire weather conditions will continue across portions of the Four Corners and Great Basin. Read More >

Hazardous Weather Conditions

Current conditions at

Muir Army Air Field / Indiantown (KMUI)

Lat: 40.44°NLon: 76.56°WElev: 476ft.

Fair

70°F

21°C

Humidity 86%
Wind Speed Calm
Barometer 30.01 in (1016.1 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 1 Jul 4:55 am EDT
Extended Forecast for

2 Miles S Jonestown PA

Heat Advisory July 3, 08:00pm until July 4, 08:00pm
Extreme Heat Warning July 1, 12:00pm until July 3, 08:00pm
Click here for hazard details and duration
Heat Advisory
Extreme Heat Warning

  • Today

    Today: A slight chance of showers and thunderstorms after 3pm. Sunny and hot, with a high near 99. Heat index values as high as 110. Light and variable wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 20%.

    High: 99 °F

    Sunny then
    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 9pm. Mostly clear, with a low around 75. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 75 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 103. Heat index values as high as 111. Calm wind becoming west 5 to 8 mph in the afternoon.

    High: 103 °F

    Hot

  • Thursday Night

    Thursday Night: Clear, with a low around 78. West wind 3 to 7 mph.

    Low: 78 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 103. Light west wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 20 mph.

    High: 103 °F

    Hot

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 75. Chance of precipitation is 20%.

    Low: 75 °F

    Slight Chance
    T-storms

  • Independence Day

    Independence Day: A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 100. Chance of precipitation is 30%.

    High: 100 °F

    Mostly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 40%.

    Low: 73 °F

    Chance
    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm after 2pm. Partly sunny and hot, with a high near 96. Chance of precipitation is 70%.

    High: 96 °F

    Partly Sunny
    then Showers
    Likely

Detailed Forecast

Today
A slight chance of showers and thunderstorms after 3pm. Sunny and hot, with a high near 99. Heat index values as high as 110. Light and variable wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 20%.
Tonight
A slight chance of showers and thunderstorms before 9pm. Mostly clear, with a low around 75. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Thursday
Sunny and hot, with a high near 103. Heat index values as high as 111. Calm wind becoming west 5 to 8 mph in the afternoon.
Thursday Night
Clear, with a low around 78. West wind 3 to 7 mph.
Friday
Sunny and hot, with a high near 103. Light west wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
A slight chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 75. Chance of precipitation is 20%.
Independence Day
A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 100. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 40%.
Sunday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny and hot, with a high near 96. Chance of precipitation is 70%.
Sunday Night
Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Monday
Showers likely and possibly a thunderstorm. Partly sunny and hot, with a high near 92. Chance of precipitation is 60%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Tuesday
Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Jonestown PA
 40.37°N 76.5°W (Elev. 499 ft)
Last Update:
5:06 am EDT Jul 1, 2026
Forecast Valid:
5am EDT Jul 1, 2026-6pm EDT Jul 7, 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