Wednesday, March 11, 2026, started with Knoxville socked in by thick fog and comfortable early-morning temps, but the quiet vibe will not last. Readings are projected to jump into the upper 70s to near 80°F this afternoon, putting the area within striking distance of record highs. After dark, a line of showers and thunderstorms is expected to sweep through, bringing pockets of heavy rain and gusty winds. Mountain communities along the Cumberland Plateau face the greatest chance for stronger storms and a low-end tornado risk.
Afternoon Heat And Winds
Temperatures are forecast to race from the 60s into the upper 70s and around 80°F by late day, which could challenge daily records. Southwest winds of 5 to 20 mph should ramp up through the afternoon, with gusts around 35 mph possible, and even stronger gusts along the highest ridgetops. The NWS Morristown notes that the combination of unseasonably warm air and increasing winds will make for a blustery, changeable day across the valley.
Evening Storms And Timing
A broken line of showers and thunderstorms is expected to move into the region sometime between about 5 p.m. and 8 p.m., then linger into the overnight hours. Some of these storms could become strong to severe, especially near the Cumberland Plateau where instability and wind shear are more favorable. Forecasters highlight a conditional low-end tornado threat, along with the potential for damaging straight-line winds. The Storm Prediction Center advises residents to keep close tabs on any watches or warnings this evening.
Overnight Rain And Commute Impact
Later tonight, heavier bursts of rain may develop, with new rainfall totals reaching three quarters of an inch to around one inch in spots where storms repeatedly track over the same area or briefly intensify. Slick roads and quick drops in visibility are likely in any downpours, so drivers planning late-night or very early-morning travel should allow extra time. For the latest details on timing and rainfall amounts, the NWS Morristown will continue to issue updates.
What’s Next This Week
A cold front is set to push through on Thursday, knocking daytime highs back into the low to mid 50s and shutting down lingering showers. Over the highest peaks, a few wet snowflakes may briefly mix in before the moisture exits. Temperatures are expected to rebound on Friday and into the weekend, but another batch of showers and thunderstorms looks likely by late Sunday into Sunday night, followed by a sharper blast of colder air early next week. Forecasters at the SPC and local offices will fine-tune the timing and severity of that next system over the coming 48 hours.
How To Prepare
Residents are urged to secure loose outdoor items such as patio furniture or trash bins, charge phones and other devices, and make sure they have reliable ways to receive emergency alerts tonight. If you have to drive through the storms, slow down in heavy rain and never try to cross flooded roads. If a warning is issued for your area, head to a sturdy interior room away from windows. Staying plugged in to local forecasts and the NWS will help ensure you are ready for any watches or warnings that develop.
