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Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Tullahoma Regional Airport/William Northern Field (KTHA)

Lat: 35.38°NLon: 86.25°WElev: 1083ft.

Fair

75°F

24°C

Humidity 83%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 17 Aug 10:55 pm CDT
Extended Forecast for

5 Miles SE Lynchburg TN

Heat Advisory August 18, 10:00am until August 19, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Mostly clear, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Clear

  • Monday

    Monday: Patchy fog before 8am. Otherwise, sunny, with a high near 94. Heat index values as high as 100. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 94 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Heat index values as high as 99. Calm wind.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 92.

    High: 92 °F

    Sunny then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Partly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 72. Calm wind.
Monday
Patchy fog before 8am. Otherwise, sunny, with a high near 94. Heat index values as high as 100. Calm wind becoming northeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 72. Calm wind.
Tuesday
Sunny, with a high near 93. Heat index values as high as 99. Calm wind.
Tuesday Night
Mostly clear, with a low around 72. Calm wind.
Wednesday
A 40 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 92.
Wednesday Night
Partly cloudy, with a low around 70.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
Thursday Night
Partly cloudy, with a low around 70.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88.
Friday Night
Partly cloudy, with a low around 69.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Saturday Night
Partly cloudy, with a low around 68.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SE Lynchburg TN
 35.24°N 86.3°W (Elev. 899 ft)
Last Update:
11:15 pm CDT Aug 17, 2025
Forecast Valid:
11pm CDT Aug 17, 2025-6pm CDT Aug 24, 2025
 
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