College Park, Md. – Millions of people across the southern United States are facing an expanding stretch of dangerous heat this week, with heat index values climbing as high as 115 degrees and little overnight relief expected through the upcoming weekend. The prolonged combination of extreme daytime temperatures and unusually warm nights is increasing the risk of heat-related illness across a broad swath of the South.
According to the NOAA Weather Prediction Center, the heat wave is intensifying from the Southeast westward through the Gulf Coast and into the Central and Southern Plains. Afternoon highs are expected to range from 95 to 105 degrees, while oppressive humidity will push heat index values above 105 to 115 degrees in some locations. Overnight lows are forecast to remain between 75 and 80 degrees, limiting the body’s ability to recover after sunset.
Forecast heat risk reaches major to locally extreme across portions of Texas, Oklahoma, Louisiana, Mississippi, Alabama, Arkansas, Tennessee, Georgia, Florida and the Carolinas through Sunday. The Weather Prediction Center also expects the hottest conditions to expand west into the Desert Southwest and north into the Great Plains during the following week, where air temperatures could climb between 110 and 115 degrees.
Forecasters note there is greater uncertainty along portions of the central Gulf Coast because rainfall and cloud cover associated with Tropical Depression Two could locally reduce temperatures. Even so, dangerous heat remains the primary concern for much of the region.
Residents should avoid prolonged outdoor activity during the hottest afternoon hours, drink water frequently, wear lightweight clothing and take advantage of air-conditioned buildings or community cooling centers when available. Check on older adults, young children and neighbors without reliable cooling, and ensure pets have access to shade and fresh water. Never leave children or animals inside parked vehicles, where temperatures can become life-threatening within minutes.
The Weather Prediction Center indicates the dangerous heat will persist for several consecutive days, with additional heat advisories, watches and warnings likely as the event continues into next week.
