Heat Wave Persists Over the Central U.S.; Significant Flooding Expected in the Northern Mid-Atlantic Tuesday

Dangerous and extreme heat will remain across portions of the Central U.S. this week, persisting across the Mid to Lower Mississippi Valleys, Gulf Coast, Southern Plains and portions of Texas. A heat wave over the Southwest will intensify late this week. Severe thunderstorms and flash flooding will spread from the Great Lakes/Ohio Valley to the Mid-Atlantic and Northeast the next few days. Read More >

Hazardous Weather Conditions

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

82°F

28°C

Humidity 66%
Wind Speed S 12 mph
Barometer 29.86 in
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 28 Jul 2:55 am CDT
Extended Forecast for

5 Miles SSE Willis OK

Heat Advisory July 28, 03:09am until July 28, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 28, 03:09am until July 28, 08:00pm

    NOW until 8:00pm Tue

    Heat Advisory

  • Overnight

    Low: 83 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 100. Heat index values as high as 104. South southwest wind 5 to 10 mph.

    High: 100 °F

    Hot

  • Tuesday Night

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

    Low: 79 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 99. Heat index values as high as 103. South wind around 5 mph.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 80. South southeast wind around 5 mph.

    Low: 80 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 99. South wind around 5 mph.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 81. South southeast wind 5 to 10 mph.

    Low: 81 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny and hot, with a high near 101. Southwest wind around 10 mph.

    High: 101 °F

    Hot

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 83. South wind around 10 mph.
Tuesday
Sunny and hot, with a high near 100. Heat index values as high as 104. South southwest wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 79. South wind 5 to 10 mph.
Wednesday
Sunny and hot, with a high near 99. Heat index values as high as 103. South wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 80. South southeast wind around 5 mph.
Thursday
Sunny and hot, with a high near 99. South wind around 5 mph.
Thursday Night
Mostly clear, with a low around 81. South southeast wind 5 to 10 mph.
Friday
Mostly sunny and hot, with a high near 101. Southwest wind around 10 mph.
Friday Night
Mostly clear, with a low around 80. South wind around 10 mph.
Saturday
Sunny, with a high near 96.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Sunny, with a high near 93.
Sunday Night
Clear, with a low around 74.
Monday
Sunny, with a high near 95.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE Willis OK
 33.82°N 96.79°W (Elev. 646 ft)
1:26 am CDT Jul 28, 2026
3am CDT Jul 28, 2026-6pm CDT Aug 3, 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