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 ...

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: ...
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 ...

See How Europe’s Heat Waves Melted the Alps’ Glaciers

The snowfall from last winter disappeared a month sooner than usual, after two early hot spells. Huge volumes of exposed ice ...