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 >

Current conditions at

Athens McMinn County Airport (KMMI)

Lat: 35.4°NLon: 84.56°WElev: 874ft.

Fair

68°F

20°C

Humidity 100%
Wind Speed Calm
Barometer 30.00 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 19 Aug 3:15 am EDT
Extended Forecast for

Watts Bar Dam TN

  • Overnight

    Overnight: Areas of fog.  Otherwise, mostly clear, with a low around 66. Calm wind.

    Low: 66 °F

    Areas Fog

  • Wednesday

    Wednesday: Areas of fog before 9am.  Otherwise, sunny and hot, with a high near 93. Heat index values as high as 96. Calm wind.

    High: 93 °F

    Areas Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: A 10 percent chance of showers and thunderstorms after 5am.  Partly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely before noon, then a slight chance of showers and thunderstorms after 5pm.  Partly sunny and hot, with a high near 90. Heat index values as high as 99. Calm wind becoming west around 5 mph in the afternoon.  Chance of precipitation is 70%.

    High: 90 °F

    Showers
    Likely then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 2am, then a chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am.  Partly cloudy, with a low around 70. Calm wind.  Chance of precipitation is 40%.

    Low: 70 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 11am, then a chance of showers and thunderstorms after 11am.  Mostly sunny, with a high near 89. Calm wind.  Chance of precipitation is 50%.

    High: 89 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of thunderstorms before 8pm.  Partly cloudy, with a low around 68. Calm wind.  Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 90.

    High: 90 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Overnight
Areas of fog. Otherwise, mostly clear, with a low around 66. Calm wind.
Wednesday
Areas of fog before 9am. Otherwise, sunny and hot, with a high near 93. Heat index values as high as 96. Calm wind.
Wednesday Night
A 10 percent chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 71. Calm wind.
Thursday
Showers and thunderstorms likely before noon, then a slight chance of showers and thunderstorms after 5pm. Partly sunny and hot, with a high near 90. Heat index values as high as 99. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 70%.
Thursday Night
A chance of showers and thunderstorms before 2am, then a chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 70. Calm wind. Chance of precipitation is 40%.
Friday
A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 11am, then a chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 89. Calm wind. Chance of precipitation is 50%.
Friday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 68. Calm wind. Chance of precipitation is 30%.
Saturday
Mostly sunny and hot, with a high near 90.
Saturday Night
Mostly clear, with a low around 67.
Sunday
Mostly sunny and hot, with a high near 90.
Sunday Night
Partly cloudy, with a low around 65.
Monday
A 20 percent chance of showers. Mostly sunny, with a high near 89.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 66.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Watts Bar Dam TN
 35.61°N 84.81°W (Elev. 794 ft)
2:26 am EDT Aug 19, 2026
3am EDT Aug 19, 2026-6pm EDT Aug 25, 2026
 
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Additional Resources

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