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The National Weather Service has issued a serious thunderstorm watch until 9 p.m. for all of Western New York.

“The main threat would be hail up to 2 inches in diameter and wind gusts up to 70 mph possible,” said Jeff Wood, a meteorologist with the National Weather Service in Buffalo.

The thunderstorm watch – which stretches as far east as Massachusetts – was issued at 1:40 p.m.

“We have a very warm, moist and unstable air mass across the region right now,” Wood said. “It’s essentially creating a lot of instability in the atmosphere.”

“When you’ve got a very strong thunderstorm, you get a strong up draft and that’s what generates the hail,” Wood added.