Northeastern US to Swelter in First Heat Wave of the Season (1)

The season’s first potent heat wave stretching from the Great Lakes to the Atlantic Ocean is set to raise electricity demand and slow transportation networks while threatening health risks.

Manhattan is set to reach 91F (33C) on Tuesday and steadily get hotter through the week with humidity making it feel closer to 100F, the National Weather Service said. Residents will find little relief at night because temperatures won’t fall that far, Allison Santorelli, a forecaster with the US Weather Prediction Center, said Sunday.

“We’re looking at widespread record-breaking temperatures starting tomorrow across the Midwest into the Northeast and Mid-Atlantic,” Santorelli ...