Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Current conditions at

Denison (KDNS)

Lat: 41.98°NLon: 95.38°WElev: 1273ft.

Fair

79°F

26°C

Humidity 70%
Wind Speed SE 6 mph
Barometer 29.99 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 19 Aug 11:55 am CDT
Extended Forecast for

4 Miles SW Wall Lake IA

  • This Afternoon

    This Afternoon: A chance of showers, with thunderstorms also possible after 4pm.  Partly sunny, with a high near 78. East northeast wind 3 to 5 mph.  Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 58. East northeast wind around 5 mph becoming calm  in the evening.

    Low: 58 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Calm wind becoming south southwest 5 to 8 mph in the afternoon.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am.  Mostly clear, with a low around 63. Southwest wind 3 to 5 mph.  Chance of precipitation is 20%.

    Low: 63 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Friday

    Friday: Sunny, with a high near 84. Light west wind.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms.  Partly cloudy, with a low around 63. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

Detailed Forecast

This Afternoon
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 78. East northeast wind 3 to 5 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Partly cloudy, with a low around 58. East northeast wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 82. Calm wind becoming south southwest 5 to 8 mph in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am. Mostly clear, with a low around 63. Southwest wind 3 to 5 mph. Chance of precipitation is 20%.
Friday
Sunny, with a high near 84. Light west wind.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Sunny, with a high near 80.
Saturday Night
Partly cloudy, with a low around 59.
Sunday
Partly sunny, with a high near 77.
Sunday Night
Mostly cloudy, with a low around 60.
Monday
Partly sunny, with a high near 80.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Partly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Wall Lake IA
 42.22°N 95.18°W
11:43 am CDT Aug 19, 2026
12pm CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

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