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

Heavy Rainfall Continues in Hawaii; Severe Thunderstorms and Heavy Rainfall in the Plains and Southern Appalachians

Areas of gusty winds, heavy rain leading to flash flooding, and high surf continue across portions of Hawaii as Tropical Storm Lala continues to move away from the islands. Severe thunderstorms and heavy rainfall will shift into the southern Appalachians today. Strong to severe thunderstorms may produce large hail, scattered wind gusts, and heavy rain today across the northern and central Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Dallas / Addison Airport (KADS)

Lat: 32.97°NLon: 96.83°WElev: 643ft.

Clear

91°F

33°C

Humidity 36%
Wind Speed W 5 mph
Barometer 30.12 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 17 Aug 10:47 am CDT
Extended Forecast for

Lewisville TX

Heat Advisory August 17, 11:04am until August 17, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 11:04am until August 17, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Today

    High: 106 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 82. South wind around 5 mph.

    Low: 82 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 106. South wind around 5 mph.

    High: 106 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 83. South wind around 10 mph.

    Low: 83 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 105. South southwest wind 5 to 10 mph.

    High: 105 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 83. South wind around 10 mph.

    Low: 83 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 104. South southwest wind 5 to 10 mph.

    High: 104 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 82. South wind around 5 mph.

    Low: 82 °F

    Mostly Clear

Detailed Forecast

Today
Sunny and hot, with a high near 106. West wind around 5 mph becoming south in the afternoon.
Tonight
Mostly clear, with a low around 82. South wind around 5 mph.
Tuesday
Sunny and hot, with a high near 106. South wind around 5 mph.
Tuesday Night
Clear, with a low around 83. South wind around 10 mph.
Wednesday
Sunny and hot, with a high near 105. South southwest wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 83. South wind around 10 mph.
Thursday
Sunny and hot, with a high near 104. South southwest wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 82. South wind around 5 mph.
Friday
Sunny and hot, with a high near 103. South southwest wind around 5 mph becoming southeast in the afternoon.
Friday Night
Mostly clear, with a low around 80.
Saturday
Sunny and hot, with a high near 102.
Saturday Night
Clear, with a low around 81.
Sunday
Sunny and hot, with a high near 103.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lewisville TX
 33.05°N 97°W (Elev. 531 ft)
Last Update:
6:12 am CDT Aug 17, 2026
Forecast Valid:
11am CDT Aug 17, 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