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.



Slide 11