This afternoon’s run of the Euro model shows a few changes that lead to a more bullish view regarding a last chance shot at a March snowfall. The model seems to be reacting to a couple of things that are going on in the atmosphere.First off the North Atlantic Oscillation is weakly positive and is trending toward neutral through next week.
Euro Model March Snow Threat Long Term Indices
This is combing with the strengthening off the wall positive Pacific North America or P.N.A. pattern index which remains off the wall positive. This leads to two outcomes. The first with regards to the N.A.O is a storm track to the south rather than to the west. The second is that the PNA means a strong ridge in the west which allows storms to amplify as they reach the east coast.
The first change actually shows up with the lead weather system for the middle of this coming week. Rather than taking a deep storm to the west