Hello again.  I expect a major storm to form along or off the east coast within the medium range.  As I wrote about 4 weeks ago the pattern is going into a negative nao (west based at that), a positive pna and a neutral mjo, (I didn't mention the pna).  The negative nao and associated blocking are about to set up just about everything a snow lover could want, but there are issues.  Climatology and sun angle along with average high temperature increasing daily are enough to overcome but there are even more issues, it's very simple to understand that without cold air it will not snow.  The cold air source is a problem, had we seen a storm these past few days it would not have been a big problem, but by next week and beyond there will not be a source of new, dry, cold air in which the temperature-dew point ratio is such the evaporative cooling could make a real differance and will be difficult to erode and will dam easily.  This airmass will give none of that assitance.  Many of us are quite certain that a major storm will form and when it does it will cause the pattern to break toward a spring-like pattern.  Whether that storm is along the east coast or off of it is something that while we don't know now, I will predict as details start to come in.  It should be kept in mind that major snowstorms in the Delaware Valley in March are few and far between, making it inherently unlikely, that said, I believe we have a better than 60 percent chance of a hecs somewhere between D.C and Maine.  I say that because the storm will form, and with all that blocking, somone is going to be affected.  I've gone over the problems but we can also look at the good things, climatology and sun-angle wise we are equivalent to late October, and easten PA had a snowstorm at that time of year in 2011, so it can and does happen.  Also a powerful storm can dynamically cool the air, I've seen Atlanta go from the low 50's to snow in the low 30's in hours just from a dynamic system passing overhead.  The ggem and ecmwf have been leaning toward a storm for a couple of days now, the ecmwf is the model I'm really watching as it is great at seeing something way ahead, that none of the other models see, (it sometimes looses it only to regain it later but that's why I'm watching it now).  I would say keep an eye on the ecmwf, the cmc  and the gfs, (I can't believe I'm mentioning the cmc but I can't bring myself to ignore that it now has 4dvar), if the gfs starts to lean toward a storm and the others still are I'll predict something a long way out (the medium/long range is sort of my "wheel house" so to speak).  I would like to write something much more detailed, but the details just aren't there yet, soon enough though we'll know, one way or the other.