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

The first widespread, significant heat wave of the summer is underway, as a massive heat dome intensifies into the Fourth of ...

Intense heat is on the way for more than half of the country, just in time for the second week of summer. "A multiday heat wave is brewing across the middle of the nation ahead of the Fourth of July ...

A wave of arctic air is infiltrating the United States, but forecasters say it will soon clear out in a warmup that will send temperatures soaring before Christmas. A winter storm is expected to bring ...