Severe and extreme heat-related impacts are expected across a wide swath of the U.S. this weekend and next week.

Land surface temperature (LST) is a critical parameter for understanding Earth's energy balance and monitoring climate change ...

At least 130 million people from Texas to Maine are under alert for dangerous heat and humidity over the next few days.

How is the heat index calculated, and why is it more important than the air temperature during some heat waves?

A Heat Advisory is in effect from noon to 9 pm Thursday. Expect heat index values up to 107 with temperatures of 99 to 103.

Sometimes the temperature outside feels warmer than it is, and there's a reason. Here's a breakdown of the heat index.