Dangerous Heat Wave Expected to Cover Most of the U.S. This Week

If you thought summer was nearly over, think again.

On Tuesday, a monstrous heat wave spread over 13 states across much of the southern U.S., including parts of Southern California, Arizona, Texas, Missouri, Tennessee, and Kentucky.

Laredo, Texas, set a new record high temperature of 109 degrees on Monday, ABC reported. In Galveston, an overnight temperature of 86 degrees also broke records. Palm Springs in Southern California is expected to top out at 111 degrees on Tuesday, according to ABC, while the state’s capitol, Sacramento, could hit 100 degrees on Tuesday, and 107 on Thursday.

“Just wait until the middle of the week; there's going to be a big warm-up,” San Diego’s NBC 7 Meteorologist Sheena Parveen said of the impending oppressive heat still to come.

According to USA Today, some of the worst conditions will likely hit Louisiana, Arkansas, Mississippi, and Oklahoma. In Mississippi, the heat index hit 121 degrees on Tuesday. West Memphis, Arkansas came close with a heat index of 119 degrees.

These temperatures can induce heat-related illness rather quickly.

“You are more likely to develop a heat illness quicker in this type of weather, when it’s really humid and hot,” Gary Chatelain, a National Weather Service meteorologist based in Shreveport, Louisiana, told USA Today. “If you’re going out in the summer, prepare for the worst.”

Of course, heat isn’t the only issue facing the mid-section of the country. On Sunday and into Monday, thunderstorms brought heavy rainfall to areas like St. Louis, which saw a record 2.68 inches in a single day, ABC reported.

That same system has now made its way east. Flash flood watches have been issued for Tuesday across eastern Pennsylvania, Philadelphia and parts of New Jersey, ABC reported. The system could produce up to three inches of rain in just a few hours.

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