Wet-bulb temperature measures the limit of evaporative cooling, not just how hot and humid it feels. Here is why the number matters more than the thermometer reading.

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.