Knoxville

Knoxville Grapples with Scorching Heat Index and Thunderstorm Threats, NWS Advises Caution

AI Assisted Icon
Published on July 31, 2025
Knoxville Grapples with Scorching Heat Index and Thunderstorm Threats, NWS Advises CautionSource: Google Street View

The heat index could hit 101 degrees, and thunderstorms are expected later. This morning, the National Weather Service reported thick fog with visibility down to a quarter mile, a sticky 73-degree dew point, and little to no wind to cool things down.

Later today, there's a 30% chance of showers and storms, mostly after 5 p.m.—typical for East Tennessee summers. Tonight will stay warm and humid, around 73 degrees, with more chances of rain and storms before things start to clear up after 9 p.m, according to the National Weather Service.

Looking ahead to Friday, there’s a 50% chance of rain and storms after 11 a.m., with a slightly cooler high of 86 degrees. Light winds will stay calm in the morning, then shift slightly north in the afternoon—a pattern expected through the weekend, as reported by the National Weather Service.

The Hazardous Weather Outlook issued by the National Weather Service Morristown TN stresses the continuing possibility of isolated flash flooding and strong gusty winds, especially with stronger storms. No spotter activation is deemed necessary at this time.