By Meteorologists Mary Gilbert, Chris Dolce, CNN (CNN) — Rounds of storms dumped rain on the Northeast and Mid-Atlantic Thursday, setting off flash flooding in parts of the already-soaked regions. Stalled storms over southwestern New Jersey dropped 4 to 6 inches of rain in just a few hours Thursday afternoon. A “large number” of water rescues were carried out in the Glassboro area and nearby Harrison Township, Gloucester County Emergency Managem…