Peconic Riverfront flooding on Feb. 27, 2013. RiverheadLOCAL file photo.

Rain, strong winds and a full moon will converge to create the potential for major coastal flooding along the Peconic Bay and the Peconic Riverfront during the high tide cycle Monday morning, according to the National Weather Service.

A coastal flood watch is in effect from late Sunday night through Monday afternoon.

The potential for major coastal flooding — 3 feet above ground — is highest for vulnerable areas along Peconic Bay and the Peconic Riverfront, as well as vulnerable areas of southern Nassau County and southwestern Suffolk, according to a NWS statement.

High tide on the riverfront at 11 a.m. Monday may reach 4.4 to 4.9 feet above normal, resulting in major coastal flooding, if strong easterly winds continue through the time of high tide, the weather service said. If winds weaken and shift to the south before high tide, flooding will likely be moderate — 2 to 2.5 feet above ground, according to the coastal flood watch statement from the weather service.

Widespread moderate to locally major flooding of vulnerable areas is possible near the waterfront and shoreline, the weather service said. Flooding will also extend inland from the waterfront along tidal rivers and bays. Vehicles parked in vulnerable areas near the waterfront may become flooded.

If venturing out this morning, expect very cold temperatures strong, gusty winds. The cold air and north winds of around 15 mph this morning will produce wind chill values of -10° to -5° into late morning today. It will be sunny and cold today with a high of about 20°, according to the NWS forecast.

The rest of the weekend forecast from the National Weather Service:

Expect increasing clouds with a high near 40° on Sunday and wind chill values between zero and 10°. Northeast winds of 5 to 8 mph will become east in the afternoon.

Snow is likely Sunday evening but will change over to a wintry mix and then all rain after 11 p.m. Temperatures will fall to near 34° by 8 p.m., then rise to around 47° during the remainder of the night. Windy, with an east wind 10 to 20 mph increasing to 24 to 34 mph. Winds could gust as high as 50 mph. Chance of precipitation is 100%. Little or no snow accumulation is expected.

Expect mostly cloudy skies on Monday, with a chance of rain during the day and a slight chance of rain and snow in the evening. Temperatures will fall to around 38° by 5 p.m. It will be windy, with an east wind 23 to 28 mph becoming south 15 to 20 mph in the morning. Winds could gust as high as 50 mph. Chance of precipitation Monday is 50%.

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Denise is a veteran local reporter, editor, attorney and former Riverhead Town councilwoman. Her work has been recognized with numerous awards, including investigative reporting and writer of the year awards from the N.Y. Press Association. She is a founder, owner and co-publisher of this website.Email Denise.