Millions across the South are still under dangerous heat warnings even as the first signs of relief begin to show. More than 18 million Americans remain under Extreme Heat Warnings, and more than 72 million are covered by Heat Alerts as a brutal stretch of weather starts to ease in parts of the region.
That matters today because the change is only partial. Feels-like temperatures have still reached 115 degrees in some places, and a Level 4 out of 4 extreme HeatRisk remains in place through Friday across the Lower Mississippi Valley and the Southeast coast. Nighttime lows are expected to stay in the upper 70s, which means the body never gets much of a break before the heat builds again the next day.
Record heat has already been widespread. Nearly 50 record-high temperatures fell across the South this week, and the hottest summer on record has now been reported for 36 cities from Texas through the Carolinas and Florida. In several places, the heat has been severe enough to rewrite local history: Dallas reached 105 degrees on Monday, Miami hit 100 degrees on Tuesday for its hottest day in 84 years, and Oklahoma City reached 109 degrees for the first time after August 11 since record-keeping began.
Some of the sharpest readings have come in the places now trying to cool down. Charleston, South Carolina, reached a heat index of 109 degrees earlier this week and is forecast to reach 94 degrees Thursday with a feels-like temperature of 108 degrees. That is the pattern across much of the South: air temperatures are beginning to drop into the mid- and low-90s, but humidity and overnight warmth are still keeping conditions dangerous.
The break is coming from a system bringing cold air from Canada that has begun to dive south, and north winds should help cut some of the humidity across the South this weekend. Even so, intense heat is expected to remain through the weekend across parts of Oklahoma, North Texas and the Texas Gulf Coast, and Dallas could stay at or above 105 degrees through next Tuesday. The relief is real, but it is uneven, and for people in the hottest corridor it is arriving later than the warning labels suggest.
That is the part to watch next. If the Canadian air keeps pushing south as forecast, more of the region should finally see lower humidity and slightly easier afternoons. But for now, the warning is simple: the South is cooling in places, yet the core of the heat wave is still strong enough to keep millions under alert through Friday and beyond.
