Walt Drag from Nyc thread
It's early, lots of sensitive interactions between northern and southern streams. My sense, the EC big warmth next week is wrong (Jan 7-11). Too much downhill flow in Canada, plus southern streamers continue and probably pretty good snow cover from somewhere nrn PA through much of NYS into northern central New England, making it easier maintain shallow cold. (a half foot or more increase possible over that of this Dec 30th morning.) Obvious wait and see but EC is very good at holding onto closed lows southern stream, but i tend to doubt its ensemble outlook week two, whereas GFS i think is reading a correct potential for phasing northern and southern streams around Jan 8-9, s of Nova Scotia. Should be an interesting period 1/3-11. Btw, the 00z/30 EC ensembles are a little faster than then the 00z EC op. GGEM/NAEFS is slower than the GFS, and am guessing Jan 4 Long duration comma head event, if I'm reading this right. 06z/30 GEFS is coming around big time to an extensive 1/2" or greater w.e. event. Yes, probably too warm NYC, but not very far nw of I95...its going to be an interesting week of potential substantial snows Jan 4 and 8ish. Another event ensemble ~ Jan 12. So, the trough has been in the east since last July. Means, if it can, it will precip but la/lo northern fringe always in doubt. Am thinking we're good for 1/2" our more qpf 12/31, 1/4 and 8 ne PA-NNJ north to at least I-90. Finally: just a comment on FV3. I have checked on this: to my knowledge here in the ne USA, i dont see it as an improvement on the current GFS model. I am told in 2020, FV3 will be a significant improvement. Meanwhile unsure of FV3 implementation date. wd 8AM