What Is a 'Heat Dome' and How Long Do They Last?

What is a 'heat dome' and how long do they last?

America is no stranger to the “heat dome.”

Heat Dome? The science behind dangerous, long-lasting heat waves

The basic phenomenon that creates the prolonged and intense heat waves often called "heat domes" is this: large amounts of air are heated high in the atmosphere over an area of the earth and this air mass get trapped or parked there, not able to move to cooler regions for days or weeks.