More than 150 million Americans are under the highest-level extreme heat alerts during a wave of above-average temperatures.

A multiday heat wave is bringing high temperatures and health risks from the Midwest to the Northeast, prompting warnings and ...

and tornadoes across the central and eastern United States. AccuWeather meteorologists are warning that an active pattern will bring thunderstorms from the northern Plains to the Atlantic coast ...

Humidity will soon surge to extreme levels across 40 states. Find out where there will be excessive heat and humidity — and ...