Ok, just for fun, since we're now only 24 hours from the start of the event with respect to tonight's 00Z model suite (data inputs from 7 pm EST), I'm going to post the snowfall maps for all of the models as they come out in this one post. I don't see a lot of value in doing this a few days out, but we ought to be getting close to model consenus now, although that's not a given.
I'm hoping I can find the UK somewhere on line, as I don't have access to that map, but someone who does often posts it and I'm hoping I can figure out how to post the Euro map, which I have access to, but haven't been able to paste for some reason. Mostly using Tropical Tidbits maps, as they show sleet as snow, which I think is important, as sleet is just as impactful as snow (the Pivotal maps ignore sleet, which would show 3" of sleet as nothing).
First up is the 00Z 12 km NAM which is out and is pretty snowy: 5-8" from Wilmington to NYC to Hartford. Snowfall amounts decrease as one nears the NJ Shore and well to the NW of 95. The 00Z 3 km NAM (higher resolution, but same model essentially - handles convective banding better) is similar, as it should be
Here's the 0Z RGEM, the regional mesoscale model from Canada, which is somewhat similar to the NAM (both mesoscale models). It's a bit less snow for 95 - more like 2-4" with less towards the coast.
And the 00Z GFS continues to keep most of the precip well to our south (as rain), with only about 0.3" of liquid falling along I-95, translating to 1-3" of snow. It's been an outlier for 2 days, but I guess it could be right (not the way to bet though).
And here's the 00Z Canadian global model, the CMC, which is pretty similar to the run from this morning, showing a general 2-3" for the 95 corridor, with less towards the shore.
Another one: the 00Z HRDPS, the high resolution versoin of the mesoscale Canadian (RGEM), kind of like the 3 km NAM vs. 12 km NAM. Showing 3-5" for most of the 95 corridor.
Can't find UK snowfall maps (think they're restricted for some reason, but have seen a couple of pros post them), but the UK is showing a fair amount of precip (0.6-0.8" liquid equivalent, which would be 6-8" of snow if all snow - not a given) and the previous runs have had similar amounts, mostly as snow; temps are at or just above 32F, so likely snow.
And last but not least, the Euro just came in and it holds serve, looking almost identical to the last 2 runs. Fairly large 4-6" swath bounded on the SE from about Philly to Middletown (and includes almost all of LI) and bounded on the NW from about Allentown to Danbury. The 2" line runs from about Dover, DE to Toms River. Can't paste Weather.US Euro maps for some reason.
7 am edit - woke up and found the Euro map...
So, what have we learned? Not much changed really. GFS still an outlier. Higher resolution models (Euro, NAM, RGEM, HRDPS) all showing more snow and these models should likely do better with thermal profiles in a marginal situation. Local media calling for 3-6" for most of I-95 and 1-3" towards the coast. My guess for my house is 4.5" of wet, sloppy snow.
I'm guessing the NWS might have just enough uncertainty in reaching 6" warning levels to mostly go with winter weather advisories for 3-6" of snow for the counties currently under watches, especially those along and east of I-95 from Mercer to Middlesex to SI/LI (and maybe Bucks/Montco in PA). Maybe the next tier to the NW might get warnings for 4-7" of snow, like Hunterdon, Somerset, Morris, Union, Essex, Hudson, Bergen and Passaic, NYC, the Lower Hudson Valley and CT. But probably not the Poconos/Lehigh Valley where they'll get less snow - just advisories there - and also advisories for PA/NJ counties bordering the Delaware south of Trenton, as well as Monmouth and maybe Ocean, I'd think.