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(Bloomberg) — New York City and the eastern US will sweat through another round of hot and sticky weather Wednesday and Thursday, a forecast that has prompted an emergency alert from the nation’s largest power grid.
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In Manhattan’s Central Park, Wednesday’s high is forecast to reach 88F (31C), but when humidity is factored it will feel closer to 95F. That’s enough for the National Weather Service to issue a heat advisory there, as well as for Philadelphia and Boston. Air quality in New York is expected to be unhealthy for sensitive groups.
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The sultry weather will linger in New York until late Thursday, when a cold front currently crossing the upper Midwest will arrive with thunder, lightning and perhaps some localized heavy rain, said Rob Carolan, owner of Hometown Forecast Services.
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High temperatures are poised to send electricity demand soaring and threaten to snarl transportation. Commuter trains often have to slow down when the heat warps rails, while overhead catenary power lines can fail as temperatures rise.
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For a second consecutive day, PJM Interconnection initiated a level 1 energy emergency alert — the lowest on the scale — and called on generators and other suppliers to be ready across the 13-state power grid stretching from Chicago to New Jersey. The grid operator also asked owners of transmission and generation to defer maintenance if possible. Demand is expected to peak at 145 gigawatts, well below the 14-year high reached in late June.
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By the weekend, the cold front will break the humidity in New York. But the relief will be short-lived, with heat expected to return early next week, Carolan said.
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