EXTREME HEAT
And it is settling in right through the Fourth of July weekend.
WHAT IS HAPPENING
It does not break overnight. The air sinks, warms and just sits there, day after day.
HOW HOT
Record highs into the 100s from New York and Washington to Chicago and Detroit.
THE REAL DANGER
More than 250 record-warm overnight lows. When it never cools down, the body never recovers.
STAY SAFE
Find air conditioning, look in on older relatives, and never leave anyone in a parked car.