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Long Island weather: Coastal flood warning for parts of Nassau, Suffolk

Expect cold temperatures and possible coastal flooding Sunday as Long Islanders prepare for the workweek, the National Weather Service in Upton said.

A coastal flood warning is in effect for southern Nassau County and southwestern Suffolk County for the high tide Sunday morning into Sunday afternoon, according to the National Oceanic and Atmospheric Administration. Coastal flood advisories are in effect for the remainder of Long Island and the western Long Island Sound shores, NOAA said.

A coastal flood watch remains in effect for southern Nassau County and southwestern Suffolk County from Sunday evening through Monday afternoon, NOAA said in its Saturday afternoon advisory.  

“Elevated water levels and high surf will likely bring significant shoreline impacts for the Long Island beachfront,” the weather service said.

The breaking surf could rise as high as 12 feet, the weather service said, predicting “significant beach flooding.” Dunes will be at risk of eroding, along with local washovers, especially during high tides.

“In addition, minor to moderate beach erosion issues are also possible along the Twin Forks, and isolated locations along the North Shore of Long Island,” the weather service said.

The odds of rain are 20% after noon on Sunday and could continue into Monday morning. Clouds and sun will duke it out for much of the rest of the week, with rain expected to return Thursday night, forecasters said.

The high should hit around 45 degrees and the low around 40, but with the wind chill factor temperatures will feel between 15 and 39 degrees, forecasters said.

The average high this time of year in Islip is 53 degrees and the normal low is 37, forecasters said.

Monday will see highs of 46 and lows in the mid-30s.

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