Overview
- Heat alerts are active across parts of the Southeast with forecasts on Sunday calling for heat‑index values commonly between 108°F and 115°F and local Extreme Heat Warnings and Heat Advisories in effect.
- The heat wave is driven by a persistent upper‑level ridge over the Gulf that limits overnight cooling and increases heat stress for older adults, children, outdoor workers and strained infrastructure such as power grids.
- A cold front pushing east is producing multiple rounds of showers and thunderstorms tonight into Monday with National Weather Service products and local forecasts warning of damaging wind gusts, frequent lightning and isolated tornadoes in the Mid‑Atlantic and parts of the Midwest.
- Forecasters have issued Flood Watches for some areas, including Franklin County, Pennsylvania, and cited the risk of localized flash and urban flooding where storms train or produce very heavy downpours.
- Models and local forecasts converge on a transition to noticeably drier, less humid air by Tuesday, offering temporary relief from the most oppressive heat while the Atlantic tropics remain quiet with low short‑term development chances.