"Extreme heat and humidity will significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities," the weather service said.
Fortunately, the stagnant weather pattern of sunny, hot and humid conditions is forecast to break down during the second half of the week, AccuWeather said.
"A southward dip in the jet stream and a cool front are likely to shift into the northeastern U.S. beginning on Wednesday," AccuWeather meteorologist Matt Benz said.
Some severe thunderstorms are possible Wednesday afternoon and evening in portions of the Northeast from Pennsylvania to Maine, the Storm Prediction Center said.
The effect of clouds, showers and thunderstorms will tend to keep a lid on temperatures in the Northeast on Thursday and Friday and potentially into the holiday weekend. After a forecast high of 98 degrees Tuesday in Boston, the high on Saturday is expected to be around 69 degrees, the weather service said.
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