Flash Flood Watch Issued For Long Island

The National Weather Service has issued a flash flood watch for Long Island. It will be in effect from noon Thursday until 6 a.m. Friday.

A cold front moving across the region will interact with tropical moisture from Hurricane Michael, which is expected to remain well south of the island before it heads out to sea Friday.

Showers, and possible thunderstorms, will develop Thursday afternoon and continue into Thursday night, resulting in moderate to locally heavy rainfall. Rainfall amounts are expected to average between 1 to 2 inches with locally higher amounts possible. Any heavy rainfall that occurs within a 1-3 hour window may result in flash flooding. The heaviest rainfall is expected to fall across portions of New York City, Long Island and southeastern Connecticut.

Much cooler weather moves in come Friday.

The full forecast:

Thursday: A chance of showers, then showers and possibly a thunderstorm after 9am. Some of the storms could produce heavy rainfall. High near 75. South wind 9 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Thursday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 61. Southwest wind 6 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

Friday: Showers likely, mainly before 10am. The rain could be heavy at times. Cloudy, then gradually becoming mostly sunny, with a high near 64. North wind around 16 mph, with gusts as high as 40 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Friday Night: Mostly clear, with a low around 42. Northwest wind 11 to 14 mph, with gusts as high as 24 mph.

Saturday: A 30 percent chance of showers after noon. Increasing clouds, with a high near 60.

Saturday Night: Partly cloudy, with a low around 47.

Sunday: Mostly sunny, with a high near 62.

Sunday Night: Mostly cloudy, with a low around 53.