What to know as extreme heat moves across Southwest, Texas and Florida: Live weather updates

Along with its magnitude, which might be harmful for some, the warmth might be notable for its longevity. Phoenix, for instance, has already logged 10 days in a row at or above 110 levels — the seventh-longest streak on document — and the forecast requires highs within the 111-to-117-degree vary till additional discover. That would catapult the heat-prone metropolis into its longest ever streak above that stage.

The warmth might be dry but punishing within the Southeast, whereas the south-central U.S. and southern Plains will deal with humidity drawn in from the Gulf of Mexico. That can overlap with the recent temperatures to push warmth indexes — measures of how scorching it feels, taking into consideration temperature and humidity — into hazardous territory.