LANHAM, Md. (WNEW) — The mid-Atlantic is bracing for a substantial heatwave ahead of the official start of summer on Saturday. Potentially record-breaking heat and high humidity will grip the area through Thursday as temperatures are expected surge to 90 degrees or higher.

The heat may help create conditions that are favorable for afternoon thunderstorms each day.

Thursday is expected to be the hottest day of the week, according to WUSA9 meteorologist Howard Bernstein.

“I think highs by then could be in the mid, even upper-90’s in a few spots,” Bernstein said.

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Temperatures are expected to begin cooling on Friday and settle in to the low-to-mid 80’s by the weekend.

“Heat is always dangerous, especially if you can’t get into an area that’s cool,” Bernstein cautions. “If you (live somewhere) that doesn’t have air conditioning, that prolonged exposure to the heat can take a toll over time.”

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