The National Weather Service issued a flood advisory for Brooklyn, Staten Island, Queens and Manhattan.
The flooding killed at least 136 people - including more than two dozen children and counselors at Camp Mystic, a century-old summer camp for girls that was among the first areas inundated.
The storm has passed, but now the costly cleanup begins for homeowners.
MTA Chairman Janno Lieber says the subway system is struggling to make up for years of neglect and disinvestment.
A 13-year-old boy died after he was trapped in a storm drain in Maryland during heavy rainfall and flooding on the East Coast that also led to rescues from cars that were submerged in floodwaters, officials said.
A series of rock structures known as the Living Breakwaters are hard to miss. Construction began in 2021 and wrapped up last fall.