Cobalt

The big thing though is that this is trending on all guidance, even ops. Perhaps once we get into 3k or 12k NAM range that the WAA trends in our favor, but as of now we're probably losing that part of the storm. At the same time, it's GFS/GEFS vs everything else for giving us a decent WWA level event on the backend of the storm, but I guess we gotta hope for that.

As I mentioned earlier with the GFS/GEFS, it seems like that group raises heights in front in turn for the system to come in and change over to snow at the end. The Euro/EPS likes none of this idea. I'd imagine the general DC area would fare better with the GFS option, as 850s crash to -3 with moderate precip still in the area. With the Euro, the WAA was as borderline as you could get, snowing at 0/-1 850s. Here's the EPS' precip depiction as the system leaves us Meanwhile, the GEFS has a fair bit more precip. Watch for this trend either on the ops or the ensembles. Given the blocking, we could totally score on an icy mix to snow scenario, especially in comparison to the torched WAA start. If only we had Arctic air in place..

We're still 12-24hours out until the 6z and 18z EPS will go out far enough to cover the 28th storm but.. 18z EPS has the juiciest look yet. Decent consensus on a slug of moisture

Or history might suggest that the GFS isnt done with the south shift and shifts a few hundred miles, setting it up perfectly for you guys *ahem December 2018*

I guess a step back from 12z, but still a good signal I was actually thinking about your rule about where we want a storm for it to adjust north last minute. Seems like even the suppressed GFS is in a decent spot for us. Shades of those few Euro runs for Jan 2016 where it completely jackpotted Richmond.

Reminds me of something...

Seems like it succeeded?? Moderate snow back into DC at 114.

Consider the 850s during the heaviest part of the storm. The 850s get even colder after the low pulls offshore a bit (still snowing though). This certainly wouldnt be 10:1, especially for the elevated areas and places where their average ratios are already 12:1 or more.

Remember that this includes snow from the Monday system. Here's what seems to be a better map. Also that doesnt include the fact that it's a fluff bomb for points NW

Jan 2000 is one of the top analogs based on the GEFS for days 8-14. Also Feb 1994.

Just like the GFS, the Euro takes a fair portion of our area back to snow. 1 more shift south like that and I'd imagine some parts of our subforum (you know who you are) would be shoveling this

March 5 2015 as well. 40s and rain changing to heavy snow. I think IAD recorded ~9 inches of snow in that.

GEFS has continuously been getting juicier for the 28th threat. I'd imagine some good hits fit into that mean. One thing of note was the higher heights leading into the storm compared to 6z. This 6z's wettest panel FWIW

Hope this is good. Captures most of the system, although I couldn't compress the GIF enough to fit the end of the storm.

Something to watch out for on the Euro/EPS. The GEFS/GFS are insistent on making snow fly on the backend, meanwhile the Euro does the exact opposite. Wonder which caves to which.

GEFS 850s compared to 6z during the storm. Certainly colder Here's the snow mean to go with it

Wow.. that system hitting a brick wall with the 50/50 low is a thing of beauty. Intensifies to a 978mb low pressure a fair bit offshore, but I'd imagine the precip would be more expansive than what is depicted. Great run for an op at this range though

And then a 996 off of Hatteras but the main slug of snow is in Pennsylvania :p. Although the main takeaway is that it has the storm. Interesting evolution too.

TT is running late for the GFS and I can't figure out a lot of the WxBell panels, but here's the GFS surface depiction at hr 165

It's interesting that while the Euro insists that DC's best chance of blue is the front end thump, meanwhile the GFS insists on crashing 850s on the backend and turning to snow then. Is it too weenie to ask for both of those scenarios to combine? :p

ICON suddenly trended warmer at 6z, but is back to a somewhat colder solution. It's a strung out mess however, yet it still manages a med range WWA snowfall for many

Euro whiffs on our 28th wave but has an interesting intensifying low pressure on the 31st at hour 240. Wonder if that's why the EPS has two distinct waves during that 4 day period.

WB 0z GEFS says see you next week...

18z EPS seems like it made another jog nw.. probably not gonna make many friends here

360 hours out, plenty of time for an east trend??