Extreme Heat Reaches East From MS Valley To Impact 185 Million Americans; Heat Indices May Hit 120F In MS, LA [View all]

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). Some locations in Mississippi and Louisiana face an even greater threat, with the heat index possibly soaring as high as 120F (49C).

Meanwhile, the midwest isn’t escaping the heat. Conditions there remain hazardous into Monday and Tuesday, after a weekend in which temperatures felt as if they were between 97 and 111F (36 to 44C) in areas from Lincoln, Nebraska, north to Minneapolis.

Cities such as Des Moines, St Louis, Memphis, New Orleans, Jacksonville and Raleigh are under extreme heat warnings. In these locations, temperatures will climb into the mid-90s and low 100s, with heat indices potentially reaching 110 to 115F.

EDIT

https://www.theguardian.com/us-news/2025/jul/28/us-weather-heatwave-temperatures-east