Forget about the 40s. The temperature at Long Island MacArthur Airport hit 50 Monday afternoon.

Shirley also reached 50, with Farmingdale getting to 51 around 2 p.m., the National Weather Service said.

Hitting the 50s may provide a psychological lift, but it also can create hazardous conditions. Patchy black ice will be a concern Monday night with "runoff from snowmelt" refreezing as temperatures drop into the 20s, the weather service said in a special statement. "Untreated roads and sidewalks will become slick and icy."

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With temperatures forecast Monday for the high 40s, areas experiencing westerly or northwesterly winds, which is much of the Island, were getting a boost of a few degrees to around 50 or so, said Tim Morrin, weather service meteorologist based in Upton. That was contingent on the wind direction holding, he said.

The last time 50 or above was recorded at the airport, where the Island's official weather data has been maintained since 1984, was Jan. 18, he said.

The normal high for this day is 46, but don't look for any records to be broken, as the top temperature was 65, Morrin said.

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Highs of around 44 are expected Tuesday, along with the arrival of a tenth to a quarter inch of rain, most likely on Tuesday night. Wednesday is anticipated to be close to 53.

Then, in the traditional "seesaw pattern for March," temperatures go down to lower to mid-40s for Thursday and around 40 for Friday, he said.

Even with a couple of warmer days, don't expect any major snowmelt, which is good news, Morrin said, as "surging warmth," especially if there were heavy rain in the forecast, would lead to flooding.

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As for the weekend, there's a 30 to 40 percent chance for precipitation overnight Friday into Sunday, the weather service said, with the "s" word -- snow -- mentioned as one possibility.

However, based on the most recent computer models, "rain is far more likely than snow at this point," said Bill Korbel, News 12 Long Island meteorologist. "Of course this could change since we are . . . five days away."