Clearly with model output ranging from just rain, or from half an inch snowto almost 8 inches those descrpancies can not be turned into a forecast at this time distance in the future. There will be a storm, but the models are having trouble calculating the interaction (phase or no phase) between two separate energy fields: one embedded in the Polar Jet Stream coming from the Northwest and the other embedded in the Sub Tropical Jet Stream coming from the Pacific Ocean.

It's been my experience that when the weather depends on phasing of two systems the forecasting is tougher than usual and may go down to the wire. There is a 100% chance of a storm system, but how it will play out is far from clear. I continue to think it's a bigger deal for SC/NC/VA Northward, but I'll let future data decide if I should change my mind.

To learn more and see the maps as things stand now go to examiner.com/Atlanta and see the slide show. Just a click away right here.