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Maps show much of the U.S. under heat advisories as high temperatures continue

By
Nicole Brown Chau
Deputy Managing Editor
Nicole Brown Chau is a deputy managing editor for CBSNews.com. She writes and edits national news, health stories, explainers and more.
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Nicole Brown Chau,
Nikki Nolan
Meteorologist, CBS News and Stations
Nikki Nolan is a meteorologist for CBS News and Stations. She graduated from Metropolitan State University of Denver with a Bachelor of Science degree in Meteorology and has worked in national weather TV coverage since 2019.
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Nikki Nolan

/ CBS News

A large swath of the U.S. remains under active heat advisories again on Wednesday, affecting more than 140 million Americans, according to . 

The extreme heat continues in the Midwest, the Southeast and some parts of the Northeast, though a cold front is moving through the north to cool things down there. Higher extremes are expected over most of the Southeast through the end of the week. 

Map shows areas under heat alerts on Wednesday, July 30, 2025.
Map shows areas under heat alerts on Wednesday, July 30, 2025. CBS News

New York City  Tuesday afternoon, hitting 100 degrees Fahrenheit at La Guardia Airport. Tampa, Florida, which is usually cooled down by a sea breeze, hit a record high of 100 degrees on Sunday, .

Temperatures on Wednesday are forecast to be in the high 90s for multiple cities with feels-like temperatures over 100 degrees — in some areas, feeling like 110 or higher.

Health-related illnesses can increase significantly during extreme heat. It's advised to drink plenty of water and stay in air-conditioned rooms, meteorologists said.

Map shows forecast high temperatures on Wednesday, July 30, 2025.
Map shows forecast high temperatures on Wednesday, July 30, 2025. CBS News
Map shows the 3-day high temperature outlook for July 30 through Aug. 1, 2025.
Map shows the 3-day high temperature outlook for July 30 through Aug. 1, 2025. CBS News

Some areas of the Rockies, Midwest and Northeast also face a risk of severe storms on Wednesday, potentially affecting cities including Denver, Kansas City, St. Louis, Chicago, Indianapolis, and along the Eastern Seaboard from Pennsylvania to Maine.

Map shows areas with a severe storm risk on Wednesday, July 30, 2025.
Map shows areas with a severe storm risk on Wednesday, July 30, 2025. CBS News

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