Weather experts are saying a High Pressure “Heat Dome” will arrive, bringing scorching temperatures and high humidity.

Temperatures in the northeastern United States will skyrocket up to about 100°F mid-week, likely breaking temperature records as the official start of summer comes this year.

Forecasters say there are two probable scenarios for the extreme heat:

A wider area in scenario #2:

Over the next six days, 265 million people, or about 82% of the U.S. population, are likely to experience temperatures topping 90 degrees as the official first day of summer arrives on Thursday.

Many cities in the Midwest and the Northeast could experience what the National Weather Services calls rare and long-duration heat with up to five straight days of 95-plus-degree weather with high humidity that will make it feel 100 to 105 degrees.

As of Monday morning, 17 states from Iowa to Maine were under a heat alert. An Excessive Heat Watch was already issued Sunday for parts of New England, including Connecticut, Massachusetts and New Hampshire. The temperature in Concord, New Hampshire, is forecast to reach 101 on Wednesday.

This will be HIGH AND LONG-DURATION HEAT

You folks already know the drill:

Wear light colored, loose fitting clothing.

Drink plenty of fluids before you go out, and while you’re out.

Check-in on the elderly and the frail to make sure they’re ok.

Other than those things, welcome to Summer!

Source