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A heavy downpour swept across the Buffalo metro area at the beginning of the afternoon commute Tuesday, slowing expressway traffic, blacking out more than 3,400 power company customers and prompting the cancellation of evening activities at Canalside.

Minor flooding temporarily closed parts of Camp Road in the Town of Hamburg and Route 240 in Colden. An advisory for small stream flooding was posted through late afternoon for Orleans, Genesee and Wyoming counties.

Officially, two-thirds of an inch of rain fell in about 90 minutes at the National Weather Service office in Cheektowaga. Winds gusted to 29 mph.

National Grid reported power out for more than 1,500 customers in Cattaraugus County, more than 600 in Erie County, mostly in Amherst and the Town of Tonawanda, and about 300 in Chautauqua County. NYSEG had more than 450 customers affected in Erie County, more than 300 in Wyoming County and about 250 in Allegany County.

The storm, which accompanied the arrival of a strong cold front, dropped temperatures from the upper 70s to the upper 60s. Today should be mostly sunny and pleasantly cool, with highs around 70 and the chance of a lingering shower or thunderstorm.