Heat maps show half the U.S. under advisories, warnings as high temperatures continue

About half the country is under active heat advisories again on Tuesday, affecting more than 168 million Americans, according to the National Weather Service. 

The extreme heat continues in the Midwest, the Southeast and some parts of the Northeast. New York City broke a record Tuesday afternoon, hitting 100 degrees Fahrenheit at La Guardia Airport. The heat alerts will remain in effect through Thursday in some places.

Many areas have already been experiencing heat waves. Tampa, Florida, which is usually cooled down by a sea breeze, hit a record high of 100 degrees on Sunday, local media reported.

Temperatures on Tueday 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.

Some areas of the Great Plains and Midwest also face severe storm threats on Tuesday, potentially affecting cities including Chicago, Milwaukee, Denver, Omaha and Lincoln, Nebraska, Des Moines and Sioux City, Iowa, and Billings, Montana.