A massive heat wave that has set scores of temperature records from Texas to California is swelling into the eastern United States. Over 100 million Americans from the Gulf Coast to the Great Lakes are under heat alerts through the middle of the week as temperatures soar toward the triple digits.

Oppressive humidity levels will make it feel 5 to 15 degrees hotter, producing heat index values from 100 to 115 degrees over a large swath of the central and eastern Lower 48.


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