This July 4th could be hottest ever in parts of U.S. Maps show the forecast expected to break records.

Extremely dangerous heat, coupled with humidity, could result in heat index readings of 100 to 115 degrees from the Midwest ...

Map Shows States Where Temperatures Feel Hotter Than Hottest Place on Earth

Multiple U.S. cities could feel hotter than California's Death Valley, known as the hottest place on Earth, on Friday.

Why we have so many ways to measure hot weather

Temperatures are skyrocketing for the third straight day across the Eastern US, but there’s at least three different ways to ...

Without Climate Change, U.S. Heat Wave Called ‘Virtually Impossible’

Scientists have said the conditions are the result of a climate that is “fundamentally different” from the time before fossil ...

Map Shows July Fourth Weather Forecast Across US

Meteorologists warn extreme heat and sudden storms could force cancellations or alter plans for communities nationwide.

Where, when and how bad the Fourth of July heat wave will be, in seven diagrams, charts and maps

The U.S. is looking at an unwelcome birthday gift: a dangerous heat wave arriving ahead of the holiday weekend. Limited time: ...

What to Know About the Heat Dome, in Three Charts

Temperatures are hitting the mid- to upper 90s in many places across the Northeast.
The New York Times

What Exactly Is the Heat Index Anyway?

The metric of how hot the air actually feels has roots in a 1979 journal paper called “The Assessment of Sultriness.” By Andy Newman In recent days, you may have seen or heard many mentions of a ...

Heat dome scorches US: Where will records be broken?

Communities in the central and eastern United States are feeling the effects of a potentially-deadly, record-breaking heat wave Wednesday. The extreme heat will be all the more dangerous as it mixes ...