Head for the beach: Members of Miami Beach Ocean Rescue keep an eye on swimmers due to the high risk of rip currents in the area Tuesday, July 19, 2016, on South Beach in Miami Beach, Fla.(Photo: Wilfredo Lee, AP)
A heat wave is set to broil most of the U.S. east of the Rockies, starting Thursday and lasting through the weekend in some places.
It will be the hottest weather of the summer for<span style="color: Red;">*</span>the entire central U.S., said AccuWeather <span style="color: Red;">*</span>meteorologist Kristina Pydynowski.
President Obama tweeted a warning about the heat on Wednesday afternoon, telling Americans to "stay safe as it heats up: Drink water, stay out of the sun, and check on your neighbors."
At least 130 million people will suffer through a heat index of at least 100 degrees this week, weather.com reported. The heat index measures how hot it feels when humidity is figured in.
"Hot and very humid conditions will push the heat index to well over 100 degrees across a large portion of the central and southern states this week," the National Weather Service warned. "Excessive heat warnings and heat advisories are in effect for much of the Plains, Mississippi<span style="color: Red;">*</span>Valley, Midwest and southern states through the weekend."
With a nationwide average high temperature of 92 degrees, Thursday is forecast to be the USA's hottest day since June 30, 2012, according to meteorologist Ryan Maue of WeatherBell Analytics.
Cities such as Chicago, St. Louis, and Dallas will all see a heat index of near 110 degrees.
The heat is courtesy of a<span style="color: Red;">*</span>"massive dome of high pressure," according to weather.com. "Beneath this dome, air sinks and warms, resulting in hot temperatures."
The Northeast and Mid-Atlantic won't start to feel the full effects of the heat until Friday, AccuWeather said. Washington, D.C., will flirt with 100 degree temperatures from Saturday through Monday, Maue said.
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