ATLANTA (AP) — Most of the South — from Texas to parts of South Carolina — will be under heat advisories and warnings as temperatures will feel as high as 117 degrees (47 Celsius), forecasters said.
The most intense heat Tuesday was expected in Mississippi, Arkansas, Louisiana, and Alabama; and in areas near Memphis, Tennessee.
The warnings come one day after the temperature and humidity combined for a Monday heat index of 121 degrees (49.4 Celsius) in Clarksdale, Mississippi. It was only a few degrees cooler in West Memphis, Arkansas.
By 10 a.m. Tuesday, the heat index was already 111 degrees (44 Celsius) in Clarksdale and 108 (42 Celsius) in Savannah, Tennessee, the National Weather Service reported. Those temperatures and others were expected to climb throughout the day.
In Alabama, the highest reported heat indexes Monday were 112 degrees (44.4 Celsius) in Florence, Tuscumbia and Gurley.
Forecasters say the heat index is what the temperature actually feels like.
Heat exhaustion and heat stroke are prime threats during heat waves, according to the federal Centers for Disease Control and Prevention.
In Kansas, a 2-year-old boy died after he was found alone in a parked car in the afternoon heat Sunday. It appears heat played a role in the child's death, Lawrence Police Chief Gregory Burns Jr. said in a statement Monday. It was about 88 degrees (31 Celsius) with a heat index of 96 (36 Celsius) in Lawrence at the time, the weather service said. The police investigation is continuing.
In Texas, TXU Energy asked its customers to dial back their thermostats between 2 p.m. and 6 p.m. Tuesday due to the extreme heat. The Electric Reliability Council of Texas, which oversees parts of the state's power grid, said it set an all-time peak demand record Monday afternoon.
The Dallas Zoo prepared for large crowds Tuesday during $1 admission day even as forecasters predicted triple-digit temperatures. A Dallas Zoo dollar admission day in July drew more than 30,000 visitors, with temperatures in the 90s, zoo spokeswoman Chelsey Norris said.
Misting tents were set up throughout the zoo for visitors to cool down. Elephants will be soaked with water cannons and offered frozen treats, she said.
The heat alerts in place Tuesday stretched as far east as the Upstate area of South Carolina.
In Spartanburg, South Carolina, the Carolina Panthers and Buffalo Bills are practicing together Tuesday and Wednesday before a preseason NFL game in Charlotte, North Carolina. Over the weekend, Panthers coach Ron Rivera had some fun with Bills coach Sean McDermott, sending a screenshot of the heat index in Spartanburg, South Carolina. It showed 110 degrees (43.3 Celsius) along with an orange emoji face dripping with sweat.
"A psychological game," Rivera joked of the scorching heat that awaits McDermott and the Bills this week.
Reeves reported from Birmingham, Alabama. Associated Press Writers Diana Heidgerd in Dallas; and Steve Reed in Spartanburg, South Carolina, contributed.