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A motorist drives a car through a flooded expressway in Brooklyn, New York, early on Sept. 2. Photo: Ed Jones/AFP via Getty Images

The remnants of Hurricane Ida brought a tropical deluge of unprecedented proportions to the New York City metro area on Wednesday night into Thursday.

Driving the news: The flooding that resulted from the heavy rainfall shut down Newark Airport, and turned city and country roads in all five boroughs and surrounding areas of New Jersey and Pennsylvania into rivers.

Why it matters: The historic deluge clearly demonstrates that climate change is winning the battle between a rapidly shifting climate and outdated infrastructure.

  • This event may now become the prime example for U.S. efforts to better adapt to climate change.
  • Studies have shown that warming air and ocean temperatures are increasing the odds and severity of heavy precipitation events, and leading to changes in hurricanes that are making them more powerful and damaging.
  • For every 1°C (1.8°F) increase in temperatures, the atmosphere can hold 7% more moisture, which helps fuel storms like Hurricane Ida.

State of play: A state of emergency is in effect for New York City, as at least 14 fatalities have been reported in the city and New Jersey, per the New York Times.

Threat level: The National Weather Service forecast office in New York City issued its first-ever “flash flood emergencies" during this event: one for northern New Jersey and one in New York City itself, as phenomenal rainfall rates overwhelmed drainage systems.

  • This is the agency’s most severe type of flood warning, reserved for cases of ongoing, catastrophic flooding with potential loss of life.
A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.

By the numbers: All-time rainfall records were shattered, with the city crushing a milestone it set just over a week ago by receiving 3.15 inches of rain in one hour at Central Park, and 5.20 inches in three hours.

  • Newark Airport in New Jersey recorded half an inch of rain in six minutes Wednesday evening. Within 23 minutes, 1.53 inches had fallen, according to an NWS meteorologist. In one hour, 3.24 inches of rain accumulated. In total, Newark received 8.41 inches of rain, which set an all-time record for the wettest day.
  • The three-hour rainfall total in Central Park qualifies as a 500-year rainfall event — though the past is an increasingly poor guide to both the present and the future, as climate change is making such rare events more frequent and likely to occur, studies show.

Details: The rainfall shut down the New York subway system, which is notoriously susceptible to flash flooding, with closures continuing as of Thursday morning.

  • Closures were also reported on regional rail networks, the busiest in the nation, and some Amtrak routes.
  • In the subway, footage of the flooding resembled waterfalls as water spilled into stations. Streets, including Queens Boulevard, were more fit for kayaks than city buses by late Wednesday night.

The intrigue: Two days in advance, the National Weather Service had explicitly forecast a dangerous flash flood scenario would unfold. However, pinpointing the exact zones of heaviest rains remains tricky, and some New York City residents may have been unaware of the scale of the flood threat.

What's next: Acknowledging the growing threat from climate change, New York Gov. Kathy Hochul told Spectrum 1 news on Thursday morning that she will seek for the subway system to be modified to prevent a similar flood from occurring again.

  • “I want this system fortified so this does not become anything more than a regular occurrence. New Yorkers deserve better than that,” the Democratic governor said. The subway is under state, not city, control.

The bottom line: The epic deluge will stand, perhaps not for long, as the most severe flash flood event in New York City history. The question now is how the local, state and federal governments will respond to this to prevent the next one from being so damaging and deadly.

Go deeper

U.S. concerned UN General Assembly could be COVID "superspreader event"

Linda Thomas-Greenfield, U.S. ambassador to the United Nations, speaks to the media. Photo: Spencer Platt/Getty Images

The Biden administration is concerned that next week's United Nations General Assembly could become a COVID-19 "superspreader event," CBS News reported.

Why it matters: Leaders from around the world will gather in New York City without necessarily abiding by the new requirement that mandates proof of vaccination for all indoor activities.

DOJ sues American Airlines, JetBlue to block "unprecedented" alliance

Photo: Andrew Harrer/Bloomberg via Getty Images

The Justice Department on Tuesday sued American Airlines and JetBlue to block an "unprecedented series of agreements" that will consolidate the two airlines' operations in Boston and New York City.

Why it matters: The civil antitrust complaint alleges that the planned Northeast Alliance (NEA) "will cause hundreds of millions of dollars in harm to air passengers across the country through higher fares and reduced choice," the DOJ said in a release.

FBI: Body identified as Gabby Petito, death ruled a homicide

A memorial dedicated to Gabby Petito near City Hall in North Port, Fla. Photo: Octavio Jones/Getty Images

A body found in Teton County, Wyoming, on Sunday was confirmed to be the remains of missing 22-year-old blogger Gabby Petito, the FBI announced Tuesday.

Driving the news: The death was ruled a homicide by the Teton County coroner's office, the FBI said. The cause of death has not been determined.