Bomb Cyclone Set To Pound Long Island: Hour-By-Hour Forecast

LONG ISLAND, NY — A 'bomb cyclone' is headed for Long Island, first bringing drenching rains and then powerful winds to the region. The National Weather Service has issued multiple advisories and watches for the island.

A flash flood watch is in effect for the entire island until 5 p.m. Tuesday. Up to 5 inches of rain could deluge the island before it finally stops falling early Wednesday.

The heaviest rain is expected to occur late Monday into Tuesday morning, the weather service says. An inch or two is likely to have fallen by sunrise. There's also a chance of thunderstorms throughout Tuesday.

As the storm strengthens, it could undergo a period of rapid intensification known as bombogenesis, which is when the central pressure of a storm drops by 0.71 of an inch of mercury (24 millibars) or more over a 24-hour period to become what is known as a bomb cyclone, AccuWeather.com says.

A wind advisory will be in effect from 2 p.m. Tuesday to 6 a.m. Wednesday for eastern Suffolk County, where the strongest winds are expected. Gusts up to 50 mph could knock down tree limbs and cause power outages. PSEG Long Island says it's ready for the storm.

Coastal flood advisories will also be in effect Tuesday on the island. A foot or two of inundation above ground level is expected in vulnerable areas near the waterfront and shoreline, the weather service says.

See the hour-by-hour forecast and info from the latest NWS briefing on the storm below.

Another coastal storm could hit the island at the start of the weekend, but for now, Halloween Sunday looks dry.

The full forecast:

Monday Night- Rain and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 59. Southeast wind 8 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

Tuesday- Rain and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 65. Breezy, with an east wind 17 to 22 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New precipitation amounts between 2 and 3 inches possible.

Tuesday Night- Rain before 2am, then a chance of showers after 2am. Low around 51. Breezy, with a north wind 17 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

Wednesday- A 30 percent chance of showers, mainly before 8am. Mostly cloudy, with a high near 62. Breezy, with a north wind 21 to 25 mph, with gusts as high as 38 mph.

Wednesday Night- Partly cloudy, with a low around 46. North wind 11 to 17 mph.

Thursday- Mostly sunny, with a high near 60.

Thursday Night- Mostly cloudy, with a low around 47.

Friday- Rain likely, mainly after 2pm. Mostly cloudy, with a high near 62. Breezy. Chance of precipitation is 60%.

Friday Night- Rain. Low around 52. Breezy. Chance of precipitation is 80%.

Saturday- Rain likely. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.

Saturday Night- A 50 percent chance of rain. Mostly cloudy, with a low around 51.

Sunday- Partly sunny, with a high near 64.