The weather service has an “excessive heat watch” posted for Sunday, when heat index values could spike to 107.
Beachgoers in Ocean City on Friday. In Philadelphia, says climatologist and heat-mortality specialist Laurence Kalkstein, heat on Sunday and Monday is expected to rank as “extreme,” the highest level on his company's three-tier system.As what is becoming one of Philly’s longer heat waves in recent years reaches its crest, it may take a dangerous and possibly deadly turn during the next few days, health officials are warning.
“If homes, especially the rowhouses, don’t cool at night,” said Garrow, “the interior temperature starts off the next day at a higher starting point, meaning it can get hotter sooner and for longer. Multiply that effect over a series of four or five days, and our homes and bodies don’t get the chance to just cool off.
In his system, Sunday and Monday have the highest probabilities of heat-wave mortality during this hot spell, which is due to continue into midweek.
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