East Tennessee Weather Forecast: Showers, Storms, and Heat Alerts for June 26, 2025

Good morning, East Tennessee!
As your local meteorologist, I’m here to guide you through today’s weather on Thursday, June 26, 2025. We’re kicking off the day with showers and storms in the Southern Valley, triggered by a lingering outflow boundary. Heavy rain and potential flash flooding are already impacting McMinn County, where slow-moving storms are causing concern.

Morning Storms and Flood Risks
The day begins with a warm, muggy feel—classic for an East Tennessee summer morning. Showers and storms are active in the Southern Valley, with McMinn County experiencing heavy rainfall and flash flooding due to the sluggish movement of these systems. These storms should dissipate through the morning, but high water remains a hazard, so avoid low-lying areas and heed any road closure alerts. Temperatures are already in the mid-70s, setting the stage for a rapid warmup.

Afternoon Heatwave with Severe Storm Potential
By lunchtime, expect temperatures to rise into the upper 80s to low 90s, with the heat index climbing to the mid to upper 90s. Afternoon highs will reach the mid-90s, but the heat index could push past 105°F, prompting the National Weather Service to extend the Heat Advisory through this evening. This intense heat poses risks, especially for outdoor workers and those enjoying the Smokies, so preparation is key.

Adding to the challenge, the Storm Prediction Center has issued a Level 1 risk for severe storms this afternoon. The atmosphere is loaded with instability and moisture, creating ideal conditions for storm development. Any storms that form could bring damaging winds exceeding 60 mph, large hail, and torrential downpours, heightening flood concerns. The Weather Prediction Center’s Level 1 flood risk further underscores the need for vigilance, particularly in areas already saturated from morning rains.

Weather Pattern Shift: Rain and Relief Ahead
Our current ridge of high pressure is weakening and shifting southeast toward the Atlantic Ocean, opening the door to changing conditions. A tropical low emerging from the Gulf and Florida will boost rain chances from Friday through the weekend, offering a break from the dry heat. Then, on Tuesday, July 1, a cold front is expected to sweep in, bringing additional storms and much-needed rainfall. If this front fully passes through—a big “if” at this stage—it could usher in lower humidity and relief from the extreme heat as we approach the 4th of July weekend, July 3-6, 2025. Stay tuned for updates as we near the holiday.

Heat Safety Tip For East Tennessee
With heat indices soaring and storms on the horizon, here are essential safety tips to protect yourself and your loved ones:

• Stay Hydrated: Drink water regularly, even if you don’t feel thirsty, and steer clear of dehydrating drinks like soda or alcohol.
• Seek Cool Refuge: Avoid outdoor activities from 10 AM to 4 PM, and find air-conditioned spaces or shaded areas to cool off.
• Wear Appropriate Clothing: Choose lightweight, loose, light-colored fabrics to reflect heat and guard against sunburn.
• Check on the Vulnerable: Keep an eye on elderly neighbors, children, and pets who are more prone to heat-related illnesses.
• Spot Heat Stress Early: Look for signs like dizziness, nausea, or a rapid heartbeat—seek medical help if heat exhaustion or stroke is suspected.

These steps are crucial as East Tennessee endures this heatwave, and following them can prevent serious health risks.