Home Weather 7/21/25: Severe Weather Alert! Thunderstorms and Heat Index Rising

7/21/25: Severe Weather Alert! Thunderstorms and Heat Index Rising

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Lightning weather conditions for local forecast
WEATHER ALERTS

Heat Advisory

Heat Advisory issued July 21 at 12:56PM CDT until July 23 at 8:00PM CDT by NWS Nashville TN

* WHAT…Heat index values up to 108 expected.

* WHERE…A portion of Middle Tennessee.

* WHEN…Until 8 PM CDT Wednesday.

* IMPACTS…Hot temperatures and high humidity may cause heat
illnesses.

SAFETY INSTRUCTIONS

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.

Alert in effect from July 21, 2025 5:56 PM until July 22, 2025 6:00 AM

Weather Alerts

Severe weather is currently being monitored in Sumner County, TN. A Heat Advisory has been issued until 8 PM CDT Wednesday, July 23. Stay tuned for updates and remain weather aware.

Severe Weather Conditions

It’s currently 6:15 PM in Sumner County, TN, with severe weather. The temperature stands at 75°F, with a high of 94°F expected later today and a low of 74°F overnight. Humidity is high at 84%, making it feel noticeably warmer. Winds are calm, contributing to the oppressive heat and a sticky atmosphere.

Heat Advisory Impacts

As the day progresses, be aware that the heat index may rise, creating dangerously warm conditions. This means outdoor activities will feel more intense and exhausting. It’s important to stay hydrated and avoid strenuous activities during peak heat hours.

Tonight’s Forecast

As we move into the evening, expect temperatures to remain warm, only dipping slightly as we approach nightfall. Severe weather might continue, so take necessary precautions if you plan to be outside. Make sure to check on those who may be vulnerable to the heat.

Interactive Radar Map

Sumner County, TN
July 21, 2025

75°
H:94°
L:74°

wind icon
Wind
0 to 5 mph NE

humidity icon
Humidity
84%

bolt icon
Conditions
severe weather

24-Hour Forecast

Tuesday
fog icon
94°
|
73°
Patchy Fog

Wednesday
sun icon
97°
|
75°
Patchy Fog then Sunny

Thursday
sun icon
97°
|
76°
Sunny

Friday
sun icon
96°
|
75°
Sunny then Chance Showers And Thunderstorms

Saturday
cloud-rain icon
95°
|
76°
Chance Showers And Thunderstorms

Sunday
cloud-rain icon
95°
|
75°
Chance Showers And Thunderstorms

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