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

Lala Impacting Hawaii; Flash Flooding Risks; Excessive Heat

Lala will continue to impact Hawaii through the weekend. Heavy rainfall, strong winds, dangerous surf and localized flooding are expected. Thunderstorms, heavy rainfall and flash flooding concerns from the mid-Mississippi Valley, Ohio Valley into the central Appalachians and the mid-Atlantic through today. Record heat continues for areas of the Mississippi Valley into the Southeast. Read More >

Hazardous Weather Conditions

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

102°F

39°C

Humidity 24%
Wind Speed S 9 G 18 mph
Barometer 30.02 in
Dewpoint 59°F (15°C)
Visibility 9.00 mi
Heat Index102°F (39°C)
Last update 16 Aug 5:50 pm CDT
Extended Forecast for

Southmayd TX

Heat Advisory August 16, 06:46pm until August 17, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 16, 06:46pm until August 17, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Tonight

    Low: 77 °F

    Clear

  • Monday

    Monday: Sunny and hot, with a high near 103. Heat index values as high as 107. Southwest wind 5 to 10 mph becoming north northwest in the afternoon.

    High: 103 °F

    Hot

  • Monday Night

    Monday Night: Clear, with a low around 78. East southeast wind around 5 mph becoming west northwest in the evening.

    Low: 78 °F

    Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 102. Heat index values as high as 106. Southwest wind 5 to 10 mph.

    High: 102 °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 102. South southwest wind around 10 mph.

    High: 102 °F

    Hot

  • Wednesday Night

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

    Low: 79 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 102. Southwest wind 5 to 10 mph.

    High: 102 °F

    Hot

Detailed Forecast

Tonight
Clear, with a low around 77. South wind around 5 mph.
Monday
Sunny and hot, with a high near 103. Heat index values as high as 107. Southwest wind 5 to 10 mph becoming north northwest in the afternoon.
Monday Night
Clear, with a low around 78. East southeast wind around 5 mph becoming west northwest in the evening.
Tuesday
Sunny and hot, with a high near 102. Heat index values as high as 106. 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 102. South southwest wind around 10 mph.
Wednesday Night
Mostly clear, with a low around 79. South wind around 10 mph.
Thursday
Sunny and hot, with a high near 102. Southwest wind 5 to 10 mph.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 77. South southeast wind around 5 mph.
Friday
Sunny and hot, with a high near 100.
Friday Night
Mostly clear, with a low around 75.
Saturday
Sunny and hot, with a high near 99.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny and hot, with a high near 99.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Southmayd TX
 33.62°N 96.71°W (Elev. 820 ft)
Last Update:
6:12 pm CDT Aug 16, 2026
Forecast Valid:
6pm CDT Aug 16, 2026-6pm CDT Aug 23, 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