Slow-moving thunderstorms spawned a significant flooding event across southeastern Pennsylvania and southern New Jersey Wednesday night into Thursday morning.

The flooding turned the early morning commute into chaos, as many roads were closed and rail service was interrupted. One of the main road closures was Interstate 295 in Bellmawr, New Jersey, where numerous motorists became stranded on northbound and southbound lanes due to the rising floodwaters.

New Jersey Gov. Phil Murphy declared a state of emergency in Burlington, Camden and Gloucester counties on Thursday in response to the extreme flooding.

Brian Nederostek, a motorist who became stranded, told 6ABC that he was walking in deep floodwater when he got out of his vehicle.

"It went up to my calves when I walked out of my car and that was not even the deepest part closer to the median of the highway. I saw the one police officer walk through and it was up to his knees," Nederostek said.

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By 8 a.m. much of the floodwaters had receded and traffic has resumed on the highway. Motorists were told to expect some residual delays.

A PATCO train station in Voorhees, New Jersey, was one of several that suffered flood damage and was forced to suspend service. Customers were being told to seek alternate transportation as several routes were suspended.

Flooding caused damage to the track ballast, which is the stone that holds the train track in place, according to PATCO.

Repairs and inspections were underway, PATCO said on Twitter. By 1 p.m., service had mostly resumed with the exception of the flooded station in Voorhees.

Boats were being used to conduct water rescues in several New Jersey communities, including the town of Westville.

VIDEO: Rescue crews have evacuated homes on Broadway, Willow and High Streets. Evacuees are being taken to Westville Community Center. @phl17 pic.twitter.com/9OTZYRpTbm

— Kelsey Fabian (@KelseyFabian) June 20, 2019

"A small but intense area of thunderstorms developed in northern Maryland and Delaware late Wednesday evening and moved into southeastern Pennsylvania around midnight," AccuWeather Meteorologist Ryan Adamson said. "The thunderstorms then stalled and continuously redeveloped in a corridor from around Reading to the south side of Philadelphia to southwestern New Jersey."

"In the course of just two to three hours, 3 to 5 inches of rain fell, causing widespread flooding. The heaviest of the rain was over by about 4 a.m., but flooding from runoff continues, making for a difficult morning commute. As mentioned, this area was small, as areas immediately surrounding the heaviest rain generally saw half an inch or less."

Philadelphia received over 4 inches of rain within a six-hour span. The city's normal rainfall for the entire month of June is 3.43 inches.

Pennypack Creek in the northeastern part of the city went above minor flood stage for a time Thursday. Near Mount Holly, New Jersey, the North Branch Rancocas Creek at Iron Works Park went above 14 feet, or major flood stage.

In Flourtown, Pennsylvania, heavy rain reportedly caused the roof of an Acme Markets grocery store to collapse, according to 6ABC. No injuries were reported.

Flash flooding was reported elsewhere across the Northeast on Thursday. In New York, flooding closed an exit ramp off Interstate 90 near Rochester and slowed traffic.

A state of emergency was declared in Oswego, New York, due to flooding. In nearby Fulton, 1.68 inches of rain fell from 11 a.m. to 12 p.m. Mayor Billy Barlow said on Twitter that he was putting a travel advisory in place that ask residents to avoid unnecessary travel. The advisory would also allow first responders time and space to get to areas of concern.

Due to heavy rains, W Albany St between Hillside Ave and Singleton St, Gardenier St Hill between Lazarek Dr and Hawley St and Mark Fitzgibbons Dr between W 5th St and Munn St, are all closed due to road flooding.

Photo credit: https://t.co/MlSn5pmsbT pic.twitter.com/kq6Dz5cH9K

— Oswego City Police Department (@OswegoPoliceNY) June 20, 2019

Pictures on social media showed a car submerged in Mount Morris, New York. According to Jennifer Lewke, a reporter for WHEC in Rochester, a neighbor with a rowboat came to the rescue of a woman who was in the trapped car. The driver was said to be OK after being rescued.

Im told a neighbor nearby used a rowboat to rescue a woman from this car that is submerged near the corner of Route 36 and Ridge Road in Mt. Morris. @news10nbc pic.twitter.com/EVBZaQyLts

— Jennifer Lewke (@WHEC_JLewke) June 20, 2019

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