New York Gov. Kathy Hochul has declared a state of emergency across parts of New York City after a potent rush-hour rainstorm swamped the city's metropolitan area on Sept. 29. The storm has shut down parts of the subway system and delayed flights into LaGuardia Airport.
The New York City Emergency Management Department, meanwhile, has issued a travel advisory beginning Sept. 29 that goes through the morning of Sept. 30, pointing out that heavy downpours may result in the flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.
"All New Yorkers need to exercise caution. If you must travel, consider using public transportation and allow for extra travel time, and if you must drive, do not enter flooded roadways," he added. "If you live in a basement apartment, especially in a flood-prone area, be prepared to move to higher ground."
According to the website, virtually every subway line was at least partly suspended, rerouted, or running with delays as of 1 p.m. ET on Sept. 29, while two of the Metro-North Railroad's three lines were suspended.
Storm Strands People in Cars
Photographs and video footage posted on social media showed floodwater submerging vehicles on neighborhood streets and water drenching the inside of subway stations, disrupting morning traffic for millions of commuters in the most populous U.S. city as streets turned into small lakes.

On Sept. 29, some 18 million people in the New York metropolitan area and other major cities along the East Coast were under flood warnings, watches, and advisories from the National Weather Service.
Despite the warnings, public schools in New York City were open for the day. However, at least one suburban district, Bronxville in New York's Westchester County north of the city, dismissed students early because of the worsening flooding.
"It is not over, and I don't want these gaps in heavy rain to give the appearance that it is over," Mr. Adams said. The mayor also declared a state of emergency.
No storm-related deaths or critical injuries had been reported as of midday, city officials said. But residents struggled to get around the waterlogged metropolis.
Additionally, several towns and cities around New York City also experienced flooding, including Hoboken, New Jersey.
