Heat Wave Sweeps Through Southern United States

A heat wave in the South forced residents to contend with scorching temperatures and dangerously high humidity on Monday and Tuesday.

Temperatures were expected to climb above 100 degrees in some places, with heat indexes as high as 118 degrees, the National Weather Service said on Tuesday.

“For 2019, this is definitely the hottest we’ve seen so far,” said Thomas Winesett, a meteorologist with the National Weather Service in Jackson, Miss.

Excessive heat warnings on Tuesday affected more than 17 million people and applied to almost all of Mississippi and wide areas of Alabama, Arkansas, northwestern Florida, Louisiana and western Tennessee. There was another excessive heat warning in less humid regions in the Southwest, and a heat advisory was in effect across much of Texas and Georgia.

“Heat exhaustion and heat stroke will be more likely if individuals and pets are not adequately cooled and hydrated,” read a bulletin from the National Weather Service in Jackson.

“You definitely want to check on any elderly people or anyone you know who doesn’t have air-conditioning or don’t have a cool place to go,” Mr. Winesett said. “If you’re working outside, take frequent breaks, drink a lot of water and stay hydrated.”

People face a higher risk of heat stroke and heat exhaustion on days when the heat index is high — a measure not only of the temperature, but also of the amount of moisture in the air, he added.

“When we get moisture in the atmosphere like we have today, it’s a lot harder for sweat to evaporate off of the body,” he said.

Cooler weather is expected to move into the region from the north on Wednesday.

While hot days are to be expected in the summer, climate scientists say heat waves are becoming more likely and hotter. The past five years have been the hottest on record, and the 10 hottest years have all occurred within the past two decades. Climate researchers have found that this past June and July were the warmest ever recorded.

Last month, another major heat wave spread across much of the United States, from the middle parts of the country to the Great Lakes and along the East Coast.

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