Overview
- Widespread heat advisories and extreme-heat warnings remain in place across the central and southern U.S., with heat indexes expected into the 110s and unusually warm nights that raise heat-illness and electricity demand risks.
- Storm systems on the heat dome’s edges produced tornado and severe-thunderstorm warnings and major travel disruption in the Upper Midwest, with reports from Monday of suspended Metra service, more than 640 cancelled Chicago-area flights, and large power outages across Wisconsin, Illinois and Indiana.
- Forecasters have increased confidence in several rounds of strong to severe storms for the Mid‑Atlantic and New England corridor Tuesday–Wednesday, warning that slow-moving or training storms could produce urban and small‑stream flash flooding and prompting flood watches for parts of Southern New England.
- The North American monsoon is feeding heavy, localized afternoon storms in the Desert Southwest while the heat threat shifts west later in the week, with forecasters noting the potential for record-challenging highs and isolated 115–120°F readings in desert pockets by the weekend.
- Officials urge residents to follow NWS watches and local advisories, avoid flooded roads, seek cooling and hydrate, and expect localized disruptions to power, air travel and rail as the combined heat and storm pattern continues to evolve.