Heat advisories, excessive heat warnings and excessive heat watches are now in effect from North Carolina to ME, covering more than 60 million people. At the emergency room the man's internal temperature reached 108 degrees, damaging his brain. Temperatures will continue to climb into the 90s in much of Upstate through Thursday. The nightime lows will go down to the 60s, more comfortable than the 70s predicted for the next few nights. Temperatures are expected to drop to to a low around 70 degrees overnight into Monday, the weather service said.
An Excessive Heat Warning is in effect Sunday as temperatures in New York City will be close to 100 degrees.
Monday will be hot but not as intense with a forecast high of 93 degrees, although it will remain humid.
These showers should be widely scattered moving in from the west in the afternoon. AAA Mid-Atlantic says July 3 traffic jams can more than double on area roads.
Eighteen states have issued heat advisories, warnings or watches, USA Today reports.
Drink less caffeine and alcohol.
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Check on family, friends and neighbors who do not have air conditioning, who spend much of their time alone or who are more likely to be affected by the heat. Officials also encourage people to ensure pets have enough food and water.
The Centers for Disease Control and Prevention has specific recommendations for the symptoms of heat exhaustion and the even-more serious heat stroke.
"Especially for kids, cooling off with a swim is helpful, but still [you have to] take safety measures to stay cool", said Dr. Shobitz. Look for partly sunny skies and a high around 91.
A heat dome, or an area of high pressure at high altitudes, is expected to cover most of the United States by the middle of the week, according to the Washington Post. Cooler sea breezes will develop on the shore each day with highs in the 80s.