But it's not just about a number on a thermometer: The USA's ongoing heat wave has also been deadly. At least 30 fatalities across the West this month are suspected to be related to extreme heat ...

A searing heat wave that has gripped much of the United States in recent days is suspected of killing at least 28 people in the last week, according to reports from state officials, medical ...

A heat wave was expected to bring record-high temperatures to the midwestern United States this week before spreading to the East Coast, forecasters said. At the same time, a bout of severe ...

A weeklong heat wave has incinerated multiple temperature records in the West, subjected millions of people to unrelenting sweltering conditions and caused dozens of deaths. More than 50 cities in ...

The eastern half of the United States faces an intense heat wave starting late this week and peaking next week that could produce dangerously high temperatures over a large area for an extended ...

When high temperatures reach or exceed 90 degrees for three consecutive days or more, that is defined as a heat wave. While New York City is no stranger to hot days, it's when those hot days ...

The first-ever excessive heat warning was issued in Caribou, Maine. Dangerously high temperatures are hitting 14 states across the Midwest and Northeast on Wednesday as an unrelenting heat wave ...

Julio Cortez/AP The Ohio Valley could experience the most impactful heat wave of the 21st century. Louisville, Kentucky, is forecast to hit 94 degrees on Wednesday, 97 on Thursday and 99 on Friday.