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Summary...heavy snow over the northwest slopes of the Catskill mountains was associated with...

• A closed low at 500 mb trapped and slightly retrograding beneath a strong upper ridge over Greenland.

• Surface low pressure over the Gulf of Maine.

• Warm advection from the northeast across a frontal zone over central New York.

• Strong low-level frontogenesis associated with the frontal zone.

• Reduced lapse rates and a favorable temperature profile for dendritic crystal growth over the frontal zone.