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Thunderstorms move across Mass.

An image from the Blue Hill Observatory showed clouds rolling into the city.

Blue Hill Observatory

An image taken from the Prudential Center showed clouds rolling into the city.

National Weather Service

Thunderstorms rumbled through Massachusetts this afternoon, but forecasters say they won’t bring much relief. Oppressive humidity shows no signs of disappearing soon.

Another set of storms was moving toward Boston from the west at 6:30 p.m, according to National Weather Service radar.

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The weather service is warning of potentially torrential downpours and localized flooding.

“The big thing with these [storms] is they’re really going to be hit or miss ... and there’s so much water in the atmosphere, we can get really heavy downpour from any storms that develop,” said weather service meteorologist Alan Dunham.

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Any flooding that develops will likely be very localized, with the biggest threat in urban areas, the weather service said.

Though Wednesday and Thursday will be slightly less muggy, Dunham said the week would be “pretty sticky, especially for September.” Wednesday will likely be mostly sunny despite some morning clouds, and the sun will stick around through Thursday. Temperatures will be a little cooler than today, falling to the mid-80s.

By Friday, the humidity will rise again before potential thunderstorms arrive Saturday. Temperatures will return to the upper 80s.

All in all, August’s cool weather has departed for the time being.

“Not a real comfortable day for the kids to go back to school,” Dunham said of today’s weather, “especially if the school’s aren’t air-conditioned.”

Kiera Blessing can be reached at kiera.blessing@globe.com.
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