These winter storm systems rarely rarely overperform. It's funny. After these types of storms are over, more often than not, people are complaining that they were dryslotted or precip. ended much earlier then modeled.
It's just amazing how we can get so much precip. in the winter(December - Feb averages over 12 inches here in the Atlanta area), yet the occurance of a snowstorm actually giving you big numbers(12+ inches) is so incredibly, incredibly rare....in fact, it's not happened once in Atlanta in the last 100 years.