Santa Claus may have to keep a closer eye on the weather late Tuesday and into Tuesday night. Forecasters say that's when snow could arrive, turning all of Long Island white -- at least briefly.

There is about a 40 percent chance of snow showers on Long Island between 3 and 10 p.m. but that's as close as the Island will get to a white Christmas, said Joe Pollina, a National Weather Service meteorologist based in Upton.

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"It's just going to be light stuff, not even going to accumulate on the roads," he said.

But dreamers of a white Christmas -- despair not.

Pollina said the dusting of snow -- up to half an inch possible for Riverhead and eastward and less for the rest of the Island -- will be enough to coat yards and more. "It could stick around for Christmas," he said.

That's because Christmas highs will be below freezing, at 29 to 30 degrees, he said.

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Expect partly sunny skies and temperatures in the low to mid 30s Tuesday, he said, and those who are "out and about" for last-minute evening shopping should bundle up, as temperatures in the low to mid 30s are expected with the windchill making it feel like the 20s, even teens, he said.