150 million Americans face ‘extreme’ heat alerts with 100-degree temps in once-in-a-century scorcher

More like the East Roast.

A once-in-a-century heatwave is frying the East Coast as triple-digit temperatures are forecast to smash daily records across the densely populated region in which more than 150 million people are under “extreme” heat alerts.

The mercury soared into the high 90s on Monday in the Big Apple and Washington, DC while other major cities like Philadelphia and Baltimore eclipsed 100 degrees — and more of the same is in store for Tuesday.

Overall, the East Coast hasn’t felt this level of extreme heat in more than a decade, said Fox Weather meteorologist Cody Braud.

“It’s been 13 years since we’ve been this hot in the summer,” Braud said.

“A lot of the records for [June 23 and June 24] were set over a hundred years ago, so we’re going to see some of these century-old records either challenged or broken,” he added.

The sweltering temps are the product of a phenomenon known as a “heat dome,” which occurs when high pressure in the upper atmosphere traps hot, stagnant air down below.

Braud said we can think of it like the lid of a backyard barbecue grill being lowered over the region, baking everything inside.

The dome should linger over the East Coast until Wednesday before moving toward the Deep South on Thursday and finally dissipating over the weekend.

Even cities on the edges of the weather system are feeling the burn.

One video posted by AccuWeather from St. Louis, Missouri, shows a street suddenly buckling in the noonday sun, creating a ramp out of nowhere that sent a hapless car airborne.