Summary… Key features associated with the Valentines Day snowstorm

• Miller type B development.

• Well-forecast mid-level warm layer across northeast Pa resulted in several hours of heavy sleet in that area.

• Primary forcing at the onset of the storm was isentropic lift and frontogenesis associated with a strong low-level jet.

• Lift intensified when upper-level forcing associated with the upper-wave became juxtaposed with the lower-level frontogenesis.

• Classic intense banding features forecast – frontogenesis, intense lift and deep layers of negative EPV*.