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

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Current conditions at

McAlester, McAlester Regional Airport (KMLC)

Lat: 34.88°NLon: 95.78°WElev: 768ft.

Fair

99°F

37°C

Humidity 31%
Wind Speed S 5 mph
Barometer 29.82 in (1008.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 19 Aug 7:53 pm CDT
Extended Forecast for

Longtown OK

Heat Advisory August 20, 01:00pm until August 20, 08:00pm
Extreme Heat Warning August 19, 08:50pm until August 19, 09:00pm
Click here for hazard details and duration
Heat Advisory
...
  •  
    Extreme Heat Warning August 19, 08:50pm until August 19, 09:00pm

    NOW until 9:00pm Wed

    Extreme Heat Warning

  • Tonight

    Low: 82 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 99. Heat index values as high as 107. North wind around 5 mph.

    High: 99 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 79. North wind around 5 mph.

    Low: 79 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 98. Heat index values as high as 105. Southeast wind around 5 mph.

    High: 98 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 80. East wind around 5 mph becoming south after midnight.

    Low: 80 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 99. South wind around 5 mph.

    High: 99 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 80. Southeast wind around 5 mph.

    Low: 80 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 100. South wind around 5 mph.

    High: 100 °F

    Hot

Detailed Forecast

Tonight
Mostly clear, with a low around 82. South wind 5 to 10 mph becoming north after midnight.
Thursday
Mostly sunny, with a high near 99. Heat index values as high as 107. North wind around 5 mph.
Thursday Night
Mostly clear, with a low around 79. North wind around 5 mph.
Friday
Mostly sunny, with a high near 98. Heat index values as high as 105. Southeast wind around 5 mph.
Friday Night
Mostly clear, with a low around 80. East wind around 5 mph becoming south after midnight.
Saturday
Sunny, with a high near 99. South wind around 5 mph.
Saturday Night
Mostly clear, with a low around 80. Southeast wind around 5 mph.
Sunday
Sunny and hot, with a high near 100. South wind around 5 mph.
Sunday Night
Mostly clear, with a low around 82. South wind around 5 mph.
Monday
Mostly sunny and hot, with a high near 100. Southwest wind 5 to 10 mph.
Monday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 82. South wind 5 to 10 mph.
Tuesday
Sunny and hot, with a high near 100. Southwest wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 81. South wind around 5 mph.
Wednesday
Sunny, with a high near 98. South wind around 5 mph becoming northwest in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Longtown OK
 35.25°N 95.52°W
Last Update:
6:50 pm CDT Aug 19, 2026
Forecast Valid:
8pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

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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