The rain fell in two waves, said Gov. Phil Murphy, with the first knocking communities 'off kilter' and the second 'came in for the kill.'

In New York and New Jersey, flooding impacted some subway lines and other mass transit services, including the No. 1, 2 and 3 lines which was severely disrupted in Manhattan due to flooding. Service has since resumed in both directions with residual delays.

New Jersey saw the brunt of the damage from Monday's storms. CBS News New York's Adi Guajardo and Naveen Dhaliwal report.

The flooding storms on Monday night flooded roads, knocked out power and led to a state of emergency for New Jersey. See which towns got the most rain.

Thousands across New Jersey lost power Monday, July 14, as severe storms blew through the region, toppling trees and knocking down wires.More than 4,600 customers were in the dark as of 6:45 p.m., utility officials said.

The weather service said there's a "marginal" risk of flooding in portions of Nassau and western Suffolk, but nothing what's expected to the west and north of LI.

Flash flood warnings were issued by the National Weather service Monday night as heavy storms rolled into the area. Flood warnings were issued for Morris, Warren, Bergen, Essex, Hunterdon, Hudson, Passaic, Middlesex, Somerset and Union Counties, according to the National Weather Service.