This story has been updated.
A pre-dawn crash involving a jackknifed tractor-trailer that initially closed two lanes at the start of the span of the new Tappan Zee Bridge in Tarrytown caused gridlock throughout the Thursday morning commute.
A quick-moving Alberta Clipper system moved through the area overnight, leading to a coating to an inch of snow and slick conditions, resulting in delayed starts for many school districts.
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