So, after a look at these particular data sources and trends, let's look at the evolution of Winter Storm Watches, Warnings and Advisories:

Important points

The data shown so far would have provided nearly 12 hours of lead time in significantly adjusting the Watch/Warning/Advisory areas

This was the last chance to change the forecasts before the 11 PM local newscasts, which would have been enough notice to prevent the

"Surprise, no snow!" when people woke up in the morning
 

Definitions:

Winter Storm Watch/Warning

VA/MD -  Potential/Expected 5+" of snow in 24 hours

NC - Potential/Expected 4+" of snow in 24 hours

Winter Weather Advisory

VA/MD - 1-4" of snow expected

NC - 1-3" of snow expected