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 >

Current conditions at

Altoona - Blair County Airport (KAOO)

Lat: 40.3°NLon: 78.32°WElev: 1467ft.

Mostly Cloudy

78°F

26°C

Humidity 87%
Wind Speed S 5 mph
Barometer 30.07 in (1016.9 mb)
Dewpoint 74°F (23°C)
Visibility 9.00 mi
Heat Index80°F (27°C)
Last update 30 Jun 9:53 pm EDT
Extended Forecast for

Defiance PA

Heat Advisory July 1, 12:00pm until July 3, 08:00pm
Click here for hazard details and duration
Heat Advisory
  • Tonight

    Tonight: Mostly clear, with a low around 70. Calm wind.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 94. Heat index values as high as 100. Calm wind becoming west around 6 mph in the afternoon.

    High: 94 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 97. Heat index values as high as 101. Calm wind becoming west around 6 mph in the afternoon.

    High: 97 °F

    Hot

  • Thursday Night

    Thursday Night: Clear, with a low around 74. Light west wind.

    Low: 74 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 95.

    High: 95 °F

    Hot

  • Friday Night

    Friday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

  • Independence Day

    Independence Day: A chance of showers and thunderstorms after 2pm.  Mostly sunny and hot, with a high near 92. Chance of precipitation is 40%.

    High: 92 °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 69. Chance of precipitation is 40%.

    Low: 69 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 70. Calm wind.
Wednesday
Sunny and hot, with a high near 94. Heat index values as high as 100. Calm wind becoming west around 6 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 72. Calm wind.
Thursday
Sunny and hot, with a high near 97. Heat index values as high as 101. Calm wind becoming west around 6 mph in the afternoon.
Thursday Night
Clear, with a low around 74. Light west wind.
Friday
Sunny and hot, with a high near 95.
Friday Night
Partly cloudy, with a low around 72.
Independence Day
A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 92. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.
Sunday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Monday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Chance of precipitation is 60%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 83. Chance of precipitation is 30%.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Defiance PA
 40.15°N 78.26°W (Elev. 1391 ft)
8:11 pm EDT Jun 30, 2026
10pm EDT Jun 30, 2026-6pm EDT Jul 7, 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