The National Weather Service quietly retired "Excessive Heat Warning" in 2025. Here's what the new terms mean, and the exact thresholds regional offices use to issue them.

Three humidity-adjusted heat numbers dominate the summer forecast, and they answer different questions. The one everybody quotes assumes you are standing in the shade.

Shelters are filling and the ports are shut as a Category 5-equivalent storm bears down on Guam and the Northern Mariana Islands, with landfall due Monday.

More than 165 million Americans face major or extreme heat risk this week as a record-threatening heat dome settles over the East Coast and Midwest through the July Fourth weekend — and complicates World Cup matches.