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Coastal storm to cause flooding, rough PM commute

November 26, 2018

A coastal storm will bring heavy rain and strong winds to the region on Monday.

Timing of the heavier rain will coincide with the evening commute, likely causing some travel disruptions, especially where urban flooding takes place.

The National Weather Service is forecasting between 1 to 2 inches of rain before it ends early Tuesday morning.

In its forecast discussion, the NWS says, “As low pressure moves from the Ohio River Valley to the lower Great Lakes today, a secondary low will form over the coastal Mid Atlantic this afternoon, rapidly intensify as it moves across Long Island this evening, then pass to the north late tonight through Thursday.

The NWS’s hourly forecast has the best chance of rain between 2 and 11 p.m.

Flood warning

A Coastal Flood Warning has been posted for southern Fairfield and New Haven counties from noon Monday to 3 p.m. and from midnight to 4 a.m. Tuesday.

Areas of concern are vulnerable coastal locations alomg western Long Island Sound.

“There is an elevated threat of property damage,” the NWS says in its warning. “Widespread flooding of vulnerable areas near the waterfront and shoreline. Expect 2 to 3 feet of inundation above ground level in low lying, vulnerable areas. This will result in numerous road closures and cause widespread flooding of low lying property including parking lots, parks, lawns and homes/businesses with basements near the waterfront. Vehicles parked in vulnerable areas near the waterfront will likely become flooded.”

In the warning, the NWS says Stamford, Bridgeport and New Haven are forecast to have a moderate flood impact during high times at around 1 p.m. Monday and 2 a.m. Tuesday. For specific tide times, click here.

A strong wind from the east will push Long Island Sound into the western basin of the Sound. Winds between 20 to 25 mph - with gusts up to 40 mph - are expected. Winds will lessen after midnigh when the storm tracks northeast.

The forecast

Today: Rain, mainly after 2 p.m. The rain could be heavy at times. High near 47. Light northeast wind becoming east 12 to 17 mph in the morning. Chance of precipitation is 100 percent. New precipitation amounts between a quarter and half of an inch possible.

Tonight: Rain before 1 a.m., then scattered showers, mainly between 1am and 5am. The rain could be heavy at times. Low around 41. Breezy, with an east wind 20 to 25 mph becoming north 9 to 14 mph after midnight. Winds could gust as high as 40 mph. Chance of precipitation is 100 percent. New precipitation amounts between a half and three quarters of an inch possible.

Tuesday: Mostly cloudy, with a steady temperature around 44. Breezy, with a west wind 17 to 21 mph, with gusts as high as 34 mph.

Tuesday Night: Mostly cloudy, with a low around 31. Wind chill values between 25 and 30. West wind 11 to 16 mph, with gusts as high as 30 mph.

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