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EXTREME HEAT

A dangerous heat dome is baking two-thirds of America

And it is settling in right through the Fourth of July weekend.

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WHAT IS HAPPENING

A dome of high pressure is trapping the heat

It does not break overnight. The air sinks, warms and just sits there, day after day.

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HOW HOT

Heat index up to 115 degrees

Record highs into the 100s from New York and Washington to Chicago and Detroit.

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THE REAL DANGER

The nights are the threat

More than 250 record-warm overnight lows. When it never cools down, the body never recovers.

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STAY SAFE

Hydrate. Cool down. Check on neighbors.

Find air conditioning, look in on older relatives, and never leave anyone in a parked car.

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