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Long IslandNassau

Black ice expected overnight on LI, NYC roads

A school bus went out of control on

A school bus went out of control on Monday on the westbound Long Island Expressway near Exit 48 and had to be abandoned. No children were onboard. (Dec. 21, 2009)

MORE: Complete coverage of the snowstorm that buried Long Island

Credit: James Carbone

The National Weather Service is advising drivers to use "extreme caution" and to beware of black ice as temperatures drop below freezing overnight.

The weather service alert is for Long Island, New York City, northern New Jersey, southern Connecticut and the Lower Hudson Valley.

Black ice is clear, difficult to see and extremely slick. Weather service meteorologist Brandon Smith said snow that melted near and on roads during the day will freeze overnight and some will become black ice.

A similar pattern - of daytime snow melt followed by freezing and ice formation on roads at night - could be in place for the next several days, Smith said.

The weather service is predicting temperatures on Long Island to reach the low 20s overnight and to rise just above freezing Tuesday.

"Slow down," Smith said. "Leave extra room between you and the car in front of you. Be aware that the road conditions could change rapidly."

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