SnowGoose69

Long Island is probably still fine. Not sure about Queens Brooklyn Bronx or NYC though unless that line stops like the 12/3Km NAM showed

Given the radar over NYC and NE NJ I’m surprised most stations aren’t reporting anything

There were some runs of the RGEM and NAM that suggested those areas and even into middlesex could mix for the first two hours before heavier rates pushed the line back south and west

I feel its always too dry with the exception of deep lows. Its not always a huge error but .25-.30 too low can be 4-5 inches if you have a 15:1 event.

I think NYC finally gets 4, whether its 4.1 or 7.2 I don't know but I'd lean closer to the 4 for sure right now though.

The Euro has been low on QPF in most significant storms so far to impact the Midwest/Lakes/NE this last 2 months so I am not surprised to see it doing the same again.

It won't even be that, it'll be 4 hours from like 7-11pm. I think after that its just snizzle/pellets/frz drizzle, even in SW CT and the LHV where they may get 7-10 inches that'll happen. Its rare to see big overrunning type events be snow all the way through, even in areas which get hit hard

The GEFS/EPS still strongly disagree on virtually every indice. GEFS likes more of a -AO/NAO/WPO/PNA whereas the EPS is way less negative on the AO/NAO and same story on the WPO/PNA

I mentioned 2/8/94 earlier for a different reason but this storm may resemble it in one way in that 80% of the accumulation may occur in the first 4 hours where some places might see 2 inch per hour rates at points. After 9-10pm it could be very light spotty type stuff with even a chance of some mixing in areas that largely stayed N of the mix line during the peak of the event.

2/7/94 was insanely mild down in the TN Valley/SE. ATL I believe hit 80 that day...might be closest match but February is a different story than Dec. Its way easier for those places to get that warm in early February than late Dec

I still think NYC ends up with a solid period of sleet with this. We're seeing the typical correction back south now we often see at this range but then inside the final 18-24 ticks back to the N tend to occur once again and sometimes verification still ends up even further N by 15-20 miles on what your game time start guidance has. There will likely be 2 big time areas who get smashed here. One will be the typical just NE of the changeover which might run from like CNTRL LI NW up through Fairfield Co and roughly SWF/POU. The 2nd will be a frontogenesis/dry air subsidence induced area somewhere in ERN CT probably up into SRN-CNTRL MASS. Overall the good news is the 3K does not agree with the 12K but given where the RGEM has been consistently and the 3K at 18Z I like a 30 or so mile shift to the NE on this roughly. I am in Flagstaff so I'll be missing the whole thing.

EPS/GEPS at 00Z long range were close, GEFS not much but at 06Z GEFS was closer to those 2. Seems main difference is GEFS though stronger on the negative side on the AO/NAO is more + on the EPO and - on the PNA than the EPS/GEPS. But if we go with history as GA has posted a few times, odds favor the +PNA in January in these similar winters.

Its sort of a SWFE behaving event, I guess its an overrunning storm, but yeah very few historical matches to this

Comes in as the 6th closest match. Closest according to CIPS is 12/14/95, overall this setup has more of the NW-SE dive though, 1995 the low tracked well north so the results of that to me are not a good match. 12/19/79 looks like by far the closest match on track but this system is more juiced and more broad. https://www.meteo.psu.edu/ewall/NARR/1979/us1219.php

It also went insanely north with yesterday's event at about 48-60 hours out too. Given nothing else at 00Z did that I'd not really change any ideas yet. The RRFS/RGEM at this range have recently tended to have slight suppression/amped biases respectively so something near what the GFS shows is what I'd go with now