A heat dome​ is trapping over 90 million Americans in extreme temperatures this week with the National Weather Service​ issuing heat alerts from Nebraska to Florida.

The ‘heat dome’ is expected to generate triple-digit temperatures in the Midlands for several days in a row soon, the National Weather Service says. Here’s what to know.

The big weather story this week is a large area of high pressure building over the central U.S., often called a “heat dome,” the FOX Forecast Center warns.

The Florida Peninsula and the western tip of the Panhandle could see heat index values between 105 to 110 degrees, which may end up being conservative estimates. High temperatures in Santa Rosa County are currently forecast to hit triple digits starting on Monday. Escambia County highs aren’t far behind them.

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The blast of heat prompted advisories across much of Massachusetts, Rhode Island, Connecticut, and in Southern New Hampshire and Maine.

Around 100 million people are under heat alerts Friday, from coastal Maine to South Carolina and across much of the Midwest and lower Ohio Valley into the Mid-South. Additional alerts are likely in the Southeast as temperatures rise in coming days.

A heat dome dries out the ground and air above it, which deters thunderstorms, but means drought can begin or worsen. A heat dome is also known as a ridge of pressure, blocking high and death ridge.