SnowGoose69

Nothing ever took that funky track but these were back to back overrunning events, first one was all snow, 2nd one was mixed. https://www.meteo.psu.edu/ewall/NARR/1994/us0126.php https://www.meteo.psu.edu/ewall/NARR/1994/us0127.php

Neither the AI or Op GFS changed much from 12z

We had a bunch of these in 93-94, I feel we've had basically none since minus PDII

Yeah I still think less juicy and more north is likely. I could see SN/PL/FZRA in NYC. I am not highly confident in this range at the metro being mostly snow at all. I don't like the -PNA and think the pattern upstream over the N Plains/MW will allow this to probably gain too much latitude before its shunted.

The temps did go to hell on this from what the models showed 3 days ago which is not surprising since it was always going to be a SW flow event in the low levels. I think its a case where you need it to be snowing by 8-9z. The longer you allow the DPs to rise on the SW flow the harder it will be to get down to 32-33 and get accumulation.

We have a pretty strong split this morning on social media as well as through friends who are Mets on the potential. I think about half say this could become a SNJ/SE PA mostly event and others saying this is a BDL/BOS bullseye. I do think even if we lean towards suppression its likely a fringer here and a bullseye in Philly. I don't know if this is Virginia special territory really.

I'd feel pretty good in most of SNE at this time. I'm trying to talk off people in NYC/PHL that I don't think this can really get far enough south for them to be all or even mostly frozen. Despite the block I don't like the upstream setup really to get this to be a northern MA event.

They're all sloppy with the QPF fields...if that ends up being more a consolidated WAA snow shield we may see this overperform. Once again though the NAM was pretty bad with this til we got inside 36. I've been saying for awhile now, avoid that model beyond 36, sometimes it does okay 36-48 but often time its the final day or day and a half where its reliable.

That is about my guess for the moment on what happens. I think it'll be extremely hard to get this to be heavily frozen this far south.

The EPO/PNA still suck in the long range, so it won't be going January 94/85 February 2015 anytime soon but the location of the PV being on this side of the pole will mean it can easily get cold enough for snow and the -PNA means we are not in a bone dry pattern. The AO/NAO have the look of not wanting to consistently stay strongly - or + so far for more than 7-10 days and often times if thats your trend through 12/31 it stays that way all winter so those 2 may largely be non major factors. The PNA/WPO/EPO at some stage likely go through a major reversal of where they've been in the next 20-30 days and that probably decides what the 1/15-3/10 period is

Yeah that definitely won't happen. I'd still lean towards this probably being too far north for anything here, but there is potential now for something when 2-3 days ago there was none.

The 18Z GEFS for the first time from like 360-384 shows signs of a +PNA trying to develop but I'd bet its close to the 12th-15th before any chance of it

I have not followed it beyond 48-60 with storms so far. I do know its had a bias of being too warm aloft, so basically the reverse of what the HRRR bias is

I’d give them a decent shot now but we got a ways to go. This system will probably have two maxes. The area that gets hit from the initial warm advection and clipper and then from the developing surface low offshore. Someone in between will get the shaft. Right now the prime shaft zones may be places like central MA down through CT and central to eastern LI. It’s a case where Morristown could see more snow than New Haven

I've not seen us get snow this far south with a clipper that far north that I remember. But its sort of a case of perfect timing here where it comes in after a fairly cold airmass is on its way out so you get overrunning snows. Its somewhat similar to 12/27/84 though that was more just a mid or upper level wave inducing overrunning snows than it was a clipper/warm front feature. It shows you how snow is often more luck than anything else and how in -PNA patterns it is easier for us to get lucky than +PNA ones where its more often boom or bust nowadays.