Heat and humidity are stretching east from the Mississippi River valley, and some areas could see heat indices of 120F
The eastern half of the US is facing a significant heatwave, with more than 185 million people under warnings due to intense and widespread heat conditions on Monday.
The south-east is likely to endure the most dangerous temperatures as the extreme heat spread across the region on Monday, spanning from the Carolinas through Florida. In these areas, heat index values (how hot it feels once humidity is accounted for) are forecast to range between 105 and 113F (40.5 to 45C).
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