Extreme Heat Across the Southern U.S.; Flash Flooding Threats in the Mid-Atlantic, Northeast, and Four Corners Region

Dangerous and extreme heat will remain across portions of the southern U.S. this week. Heavy rainfall may bring significant flash flooding across portions of the Mid-Atlantic and Northeast through the night, and additional flash flooding concerns across New England on Wednesday. Monsoonal thunderstorms will bring a flash flood risk to the Four Corners region, especially in burn scar areas Read More >

Hazardous Weather Conditions

Current conditions at

McKinney - McKinney National Airport (KTKI)

Lat: 33.18°NLon: 96.59°WElev: 584ft.

Fair

79°F

26°C

Humidity 82%
Wind Speed S 3 mph
Barometer 29.85 in (1010.0 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 29 Jul 3:53 am CDT
Extended Forecast for

4 Miles NNW Merit TX

Heat Advisory July 29, 03:57am until July 29, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 29, 03:57am until July 29, 08:00pm

    NOW until 8:00pm Wed

    Heat Advisory

  • Overnight

    Low: 78 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 100. Heat index values as high as 108. South wind 5 to 10 mph.

    High: 100 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 79. South southeast wind 5 to 10 mph.

    Low: 79 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 100. Heat index values as high as 107. South southwest wind 5 to 10 mph.

    High: 100 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 79. South southeast wind around 10 mph.

    Low: 79 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 103. Southwest wind around 10 mph.

    High: 103 °F

    Hot

  • Friday Night

    Friday Night: Partly cloudy, with a low around 80. South southwest wind 5 to 10 mph.

    Low: 80 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 98. North wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 98 °F

    Sunny

Detailed Forecast

Overnight
Mostly clear, with a low around 78. South southwest wind around 5 mph.
Wednesday
Mostly sunny and hot, with a high near 100. Heat index values as high as 108. South wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 79. South southeast wind 5 to 10 mph.
Thursday
Mostly sunny and hot, with a high near 100. Heat index values as high as 107. South southwest wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 79. South southeast wind around 10 mph.
Friday
Sunny and hot, with a high near 103. Southwest wind around 10 mph.
Friday Night
Partly cloudy, with a low around 80. South southwest wind 5 to 10 mph.
Saturday
Sunny, with a high near 98. North wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 74. North northeast wind 5 to 15 mph.
Sunday
Sunny, with a high near 95.
Sunday Night
Clear, with a low around 73.
Monday
Sunny, with a high near 97.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny, with a high near 98.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW Merit TX
 33.28°N 96.3°W (Elev. 558 ft)
1:26 am CDT Jul 29, 2026
3am CDT Jul 29, 2026-6pm CDT Aug 4, 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