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The "heat advisory" was expected to peak on Thursday afternoon with it feeling close to 100 degrees. (National Weather Service map)
The “heat advisory” was expected to peak on Thursday afternoon with it feeling close to 100 degrees. (National Weather Service map)
Rick Sobey
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The hot and humid weather is expected to persist into Friday after the peak of the Massachusetts “heat advisory” Thursday afternoon, as heat index values approached 100 degrees while Boston faces a “heat emergency.”

National Weather Service meteorologists were warning residents about the risk of heat exhaustion and heat illnesses amid this early September blast of brutally hot weather. The “heat advisory” remains in effect through Friday evening.

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors,” the National Weather Service wrote in its advisory. “Young children and pets should never be left unattended in vehicles under any circumstances.

“Take extra precautions if you work or spend time outside,” NWS added. “When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible.”

The oppressive heat will continue on Friday, but it thankfully won’t be as brutal as Thursday.

“In general, the heat is peaking in most of Massachusetts on Thursday, and it will be slightly less hot on Friday, but still oppressively hot in areas,” said Torry Gaucher, meteorologist at the National Weather Service’s Boston office.

Temps will then drop over the weekend into the 80s on Saturday and upper 70s on Sunday.

In Boston, Mayor Michelle Wu declared a “heat emergency” through Friday. Cooling centers will be open at 15 Boston Centers for Youth and Families (BCYF) community centers from 9 a.m. to 5 p.m.

Also, 64 splash pads will be open at parks and playgrounds throughout the city. Boston Public Library locations are also available for residents to seek relief from the heat.

With the school year for Boston Public Schools beginning on Thursday, BPS was encouraging students and their families to prepare for hot weather by staying well hydrated and dressing appropriately. Most BPS schools have air conditioning. The city was supplying water and fans to those schools that need it.

“The impacts of climate change are more palpable than ever, with extreme heat posing risk to our communities,” Wu said in a statement.

“Although extreme heat affects Bostonians of all ages, with the new school year starting, our Boston Public Schools staff will be following protocols to ensure our kids have an enjoyable, safe first week back at school,” the mayor added. “I’m grateful to our City employees who are working tirelessly to support residents, and ask residents to take precautions.”

BPS is following the MIAA guidelines for weather and will be checking in with coaches and BPS athletics regularly to ensure that students are safe, the city said.

During last summer’s heat wave, Boston EMS experienced a 15% to 20% rise in daily calls to 9-1-1.