Perhaps irrelevant. Warm air surge of moisture pushing over a cold dome. Forecast was for a 2-4" with a change to sleet and ice. Began as Heavy snow and lasted from say 2-10 pm. Put 8 " down in that time period. Bigger difference was, if my recollection is correct, cold air had been much more entrenched. And in no way am I saying this is that....just a reminder that sometimes these do overperform...that was an instance