Flash flood watches issued for NYC, Long Island and more

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NEW YORK (PIX11) -- Flash flood watches are in effect for all of New York City and Long Island as torrential downpours are expected to soak the region.

Multiple rounds of showers and thunderstorms will move through the region ahead of a cold front starting Monday afternoon, according to the National Weather Service.

The warm and humid air mass will create the ideal conditions for torrential downpours, the agency said. There is also a slight risk for severe weather, with the most significant concerns being damaging winds, flash floods and possible hail.

Between 2 and 3 inches of rainfall are expected through Wednesday, when the rain is expected to let up.

Chances for flash flooding will last through at least Tuesday night, according to the National Weather Service. Portions of southeast New York, northeast New Jersey and southern Connecticut are all under the watch.

Low-lying areas, roadways, areas with poor drainage, small streams and rivers have the most potential to flood, officials said.

These New York counties are under the flash flood watch as of Monday morning:

  • Bronx
  • Dutchess
  • Kings (Brooklyn)
  • Nassau
  • New York (Manhattan)
  • Orange
  • Putnam
  • Queens
  • Richmond (Staten Island)
  • Rockland
  • Suffolk
  • Ulster
  • Westchester

In New Jersey, a flash flood watch has been issued for the counties:

  • Bergen
  • Essex
  • Hudson
  • Hunterdon
  • Mercer
  • Middlesex
  • Monmouth
  • Morris
  • Passaic
  • Somerset
  • Sussex
  • Union

In Connecticut, New Haven and Fairfield counties are under a flash flood watch.

PIX11 meteorologist Rachel Frank contributed to this report.