Storm knocks out power for thousands, prompts flash flood warning

On the evening of August 17, 2026, a severe thunderstorm system moved through Knoxville, Tennessee, causing widespread power outages and prompting a flash‑flood warning for several counties.

Power Outages

The Knoxville Utilities Board (KUB) reported that more than 6,900 customers were without power as of 6 p.m. The outage map showed the largest impact in West Knoxville, with additional outages reported in downtown, South Knoxville, and rural parts of the county. By 6:35 p.m., the number of affected customers had fallen below 6,000. KUB serves over 229,000 residents; more than 97 % of customers had power restored by 6:15 p.m. The outage center confirmed that employees were actively working to restore service. Residents could report outages through the KUB website.

Outages were also reported in neighboring Grainger, Sevier, and Union counties, indicating the storm’s broad reach across the region.

Flash‑Flood Warning

Heavy rainfall from the same storm prompted the National Weather Service to issue a flash‑flood warning for Anderson County, central Knox County, east‑central Morgan County, and south‑central Scott County until 8:15 p.m. The warning highlighted expected flooding in Knoxville, Oak Ridge, Clinton, Oliver Springs, Halls, Rocky Top, Norris, Powell, Karns, and Bearden.

Flooding was also likely along Interstate 75 between mile markers 108 and 129, and Interstate 40 between mile markers 379 and 400. Drivers were advised not to venture onto flooded roadways.

Additional Weather Outlook

According to the National Weather Service, more showers and thunderstorms—some potentially severe—were expected before 11 p.m. on August 17, 2026. The agency urged residents to remain alert to changing conditions and to follow official advisories.

Preparedness takeaway

Keep a basic emergency kit ready: water, non‑perishable food, a battery‑powered radio, flashlights, extra batteries, a first‑aid kit, and a portable charger. Store the kit in an easily accessible location and check supplies regularly. If you need compact emergency nutrition, consider adding a Survival Tabs pack to your kit for quick, balanced meals. Stay informed by listening to local alerts and follow official guidance to keep yourself and your family safe.

Source: Knoxville News Sentinel. This article is an original summary based on the cited reporting.