A heat dome happens when hot air is trapped over an area due to a persistent high pressure system, William Gallus, a ...

Millions of Americans are under weather advisories this week. See which major cities have heat, flood or storm advisories.

The heat index, or how it feels with humidity factored in, will rise into the triple digits for millions as the hot dome of ...

Almost 85 million Americans from South Dakota to Texas and North Carolina to Florida are already under extreme heat warnings, ...