A powerful weather pattern is trapping heat across the U.S. Here’s what it means

Millions of Americans are facing another round of dangerous summer heat as a weather pattern known as a heat dome settles over parts of the country, pushing temperatures higher and increasing the risk of heat-related illnesses. The phenomenon has become increasingly familiar during extreme heat events, creating stretches of unusually hot weather that can last for several days or longer, KARE 11 reports.