MillvilleWx

I would say this is the most valid concern for the whole event. Miller B's/Hybrids are ALWAYS a tight rope balance for the Mid Atlantic.

THAT was one hell of a run for much of the sub-forum. Despite the bit of mixing during part of the coastal for the cities, everyone is puking dendrites at some point during the height of the coastal. US15 to I81 from Winchester to Harrisburg could be the deformation zone on this run verbatim. The whole area gets walloped in all. 1'+ for a ton of the sub. Even with the slightly farther north track of the surface low into southern Ohio, the goods are still delivered. I liked seeing a consistent hold of the ULL as it crosses into the Ohio Valley as well, strengthening again as it moves east. The 7H low cuts right over the Potomac. Just a slightly further south depiction, and it's blockbuster for basically everyone. A great run

You think that's disturbing? Try spending tens of thousands of dollars, taking copious math courses, drowning yourself in coffee/tears/booze, and then subjecting yourself to no sleep for the rest of your life so you can see how water condenses and air moves.

Well that was one hell of a GFS extended run. @HighStakes nailed it on the head. Plenty of waves to contend with too and baroclinic zone pressed to the south, which prevents the cutter potential. Hell, even a marginal low track can bring winter that those kind of temp anomalies. Hopefully the trend for that time frame continues. That's historically the meat and potatoes for snow events back home.

Pretty much. And it's certainly a cause for concern for anyone in the Mid Atlantic in general. Hopefully the Euro stays the ground because I sure like what the CMC/Euro combo is doing.

I haven't peeked at it yet, but I certainly will now that you mention it. We've got our own fun wind bags incoming for this weekend and pretty much half of next week, so I've been mulling over the data there. Could have a 3 day High Wind Warning for Guadalupe Pass out here next week. Good times! lol

I agree.... so $100 on the GFS?

I muted Ji a long time ago, and I still don't think it was enough. He might be the one of the worst posters I've ever come across on any forum, and I'm on Twitter...

So.....we're putting $50 on the GFS, right?

I just logged on and took a brief look at the 00z runs tonight. One of the best details I'm seeing is in regard to the first 6 hrs of the event with the WAA piece. The airmass ahead of the precip is ripe for a better snow consistency as boundary layer temps are pretty cold. The 850-700mb Frontogen on the CMC/Euro is pretty respectable, so the crystal structure would start out as more dendritic, then shift as the 850mb WAA noses in, and we proceed to larger aggregates with more rime exteriors. You don't need hefty precip in order to have some respectable totals for the area. The CMC is a beautiful compromise for WSW criteria snowfall. Of course, a 12z Euro presentation would be epic for a multitude of reasons, but the potential for a formidable event has increased in my eyes, just off the initial slug that presents itself on Sunday and Sunday night.

I just woke up briefly. One more night of mids, so I’ll be on the model watch night shift. I must say, to see CIPS coming in that bullish, I’d be beyond ecstatic for all the sub-forum. Traditional caveats aside for these storms, it’s hard to hate the coastal low placement and strength. We don’t have potential for anomalous u-wind vectors to transport warm Atlantic air into a decaying boundary layer. We don’t have HP moving East into Nova Scotia as the low reaches MD/VA latitude. We don’t have a screwball low to the north that causes temp issues later on and instigates a drier NW flow on the western front to cut into precip expansion. If the GFS comes on board tonight, I’d say start prepping the shovels, grab the beer, and get ready for fun. I’ll have more to talk about tonight. But first, back to your regularly scheduled zombie. .

Eh. He was okay

I think the deterministic models are certainly better than the past, but the physics get amplified compared to a smoothed ensemble mean. So, one small shift in deterministic will have more drastic impacts comparative. I think the ensemble run this evening showed that perhaps the more strung out nature of the 5H vort might have been too exaggerated as the EPS even looked better with a more pronounced 5H vort pass and deepening low tucked in a climatologically favored position for the sub-forum. I was checking the Prob Height fields and was encouraged to see such a high prob of <540dm location in conjunction to the deterministic. It was sort of classic and even a bit further north than I was expecting. That's probably why there are so many ensemble lows tucked near OCMD and Wallops compared to Kitty Hawk. The ridge out west does bug me a bit. I like my ridges scouring for potatoes in ID and not roaming the northern Rockies in MT. One of those cases where a further downstream ridge axis will want to be a bit flatter compared to when its further upstream. Hopefully a Euro overamplification bias comes into play and it corrects. It's at that range where that can occur. Pretty classic medium range ECMWF.

If only we could get atmospheric rivers into the east coast. Stupid land

EPS certainly looks good to me. Seen way worse at these leads. I'd be encouraged and anyone from PA to NC should be paying close attention to this sucker.

That in itself is insane. I need to move back to bring the snow back with me

The run wasn't the 12z run but it wasn't that far from being a monster hit. At Day 5/6, just having the 5H potential is pretty solid. Don't get sold on one or two operational runs. Use them as ensembles for potential. We likely saw the max potential for this storm on the 12z ECMWF. This isn't bad for part of the sub-forum. HECS would be cool, but they are so low probability. MECS is certainly at play with the type of energy being depicted on guidance. Negatively tilted troughs near my hood, moving eastward are pretty good to see at inside 72 hr leads. From there, lots of variables at play. If you think models have a handle on this in full, then you haven't been looking at east coast weather long enough. Get some sleep y'all. A potentially long weekend ahead full of highs/lows, head fakes, disappointments, and potential jubilation.

The boundary layer was considerably cooler this run compared to the last set. 850mb temps were 1-3C colder at onset which is huge. That was a really nice run. Borderline WSW for the NW folks and a solid WWA for DC proper. Good run

This is a heads up to all that the ZR accumulation maps are just model interpreted rain soundings falling into sub-freezing surface layer. The total ice is another physical paradigm that has a lot of other factors at play. This event is certainly looking frozen for a lot in the forum, but mainly a quick snow to sleet/zr as the lower boundary layer warms quickly with the wave pressing northeast. However, the antecedent airmass ahead and in place during the event will be enough to create some issues, especially with a lot of the precip occurring after prime heating. Low dew points in the region should provide sufficient wet bulb to ~29/30 for areas to the NW of the fall line, which could lead to prolonged icing concerns for the evening. Hourly precip is light for the most part as well, so this should allow for a better accretion environment IF the GFS were to oblige verbatim. Looking at a sample sounding on Monday evening, check out KFDK where the precip algorithm is basically on the border of snow/sleet with ice further to the south and east. This is such a razor thin margin for what type of precip will be dominant during the beginning of greater mid-level ascent. In fact, it's even more of a snow signature for areas north of I-70 which is a benchmark for these types of borderline events. This has Winter Weather Advisory written all over it with an outside shot at WSW for areas north of the interstate and out by I-81. Lift is there. The cold is there for once. It's a matter of boundary layer warmth off the southerly low level flow between 7H and the surface.

One of the key differences with regards to ptype at the beginning of the event is the regional dewpoints which would allow for sufficient wet bulb with sub-0C within the boundary layer. Taking a look at the GFS and ECMWF differences, you can see a drier layer present aloft which would allow for enough of a wet bulb to begin as snow through areas north of Rt 50. ECMWF GFS Notice the contrast in lower dews to the north on the Euro compared to the GFS. This little tidbit may be the difference between a longer frozen event compared to a hit and run. This is a classic north of I-70 remaining frozen longer with more impacts for the evening rush since majority of precip is after 21z. Something to monitor. As far as the UL pattern goes, there isn't much of a difference between the 12/18z runs to the 00z, so the main characteristics of ascent are unchanged with focus mainly on surface and lower boundary layer.

Recovering from a back injury, so I have not followed anything in 2 weeks. I'll try to look at things in the coming days and give my 2 cents. On mid shifts until next Thursday AM. Hope all is well

Congrats to all the Buffalo fans in here. Crazy game .

Idk what kind of luck I'm having right now, but models trending more bullish here for snow. 5H track is close to perfect for Midland, but looks like best ascent is just off to the north. I'm probably going to do an early morning snow chase on Sunday and will return in time for the Ravens game. I really hope you guys can score soon. I'm just happy we're getting precip here.

Probably pretty rare in a Nina since you need that subtropical connection, but the wave amplitude so far has been anomalously in favor of digging s/w with lower lat push compared to normal. Hopefully it can keep the same pattern with more established cold. There were a fair amount of SWFE events in the front 6 years of the 2010's, but they've hit a snag recently. Probably just reverting to averages. Hopefully y'all can cash on one later this month or February.

My favorite part about SWFE events is the ferocity of the thump with a more organized system. No waste on virga, hot and heavy starts, massive aggregates, and typically pastes everything into a wintry scene. I know that you probably really enjoy those living well west of the fall line. Some of the best 12"+ storms are like that in your hood.