Typhoon Tip

Folks should try and remember ...whether for muse or the educational value. This is the hemisphere on Friday morning according to the GEF's mean. Looks pretty convincing snow stormy, huh -

I'm starting to wonder if the -EPO gush for mid March may be a red herring - It's already a little less panache/attitude in the ens means out there - I haven't seen the 300 EPS but.. 240 ... Anyway the GEFs seems a little less impressive. Plus, we have to remember that radiative forcing across the hemisphere is a huge delta and it can start normalizing things particularly as we head deeper into March. I was telling others that the EPO may not correlate on March 15 the same way as it does on Dec 30.

We haven't had one of those type of BD events in quite some time. ... We've had our springs disrupted by other weirdness, causing wild oscillations of temperature that were not related to BD's per se - it may be that these odd springs have interfered with the general circulations types the cause the BD phenomenon. We've had them..but they've tended to shallower versions. I have to go back to the aughts of 2000 to get one of those big dawg shock and awe BD blasts. The last I recall was April of 2003... I was working at the time down on Comm Ave, across from the BU rec center - which doesn't exist now..I think it's a gym and whatever... Anyway, it was 94 F at noon, partly cloudy with CU and some TCU toes along the horizons. The BD roared through the city, passing that location at 1:30 PM... The sky was interesting, with Kelvin-Hemholtz rolling scud fragments racing W, while the towers of cu leaned east over top. When I left to head up the street for the parking garage, I did so in 45 F ... essentially a 50 F correction between 1:30 and 5:30. It was 39 by 8 pm all the way out to Waltham where I lived. That BD never made as far west at ALB... That next day, I recall it was 86 out there, while it managed back to 43 still under slate sky back in Boston. That was one of the more impressive ones I experienced, but the most was March 31 1998. It was 91 F ...in fact, it was D 3 of a 89, 90, 91. It was truly unique. I think those records will probably stand for a long while, as they have since. But at 3:15 pm on the 31, it was 91.4 F on the monitor at UML's wx lab. I looked at the obs up in Maine, knowing that the BD was coming... at that time, CAR's ASOS was 36 F with NE wind gusting to 45 mph. That radar had that serpent. Sometimes very powerful ones will get a weak ribbon echo ...probably because their plowing pollutants along - I dunno what drives that honesty. But it sinuous like a side-winder as it moved SW from out of Maine about to enter NH. It came through the Merrimack Valley around 5:45 ... with a lot wind and dust. 38 at dawn the next morning.

I recently was given the impression it may be this year ...

OH there you are

heh... jackpot could very well be where I'm located here in Ayer. In fact, I could see 15 or so mi either side of a line from Petersham, me, Lowell, Methuen maxing... Still time to wiggle S(N) but for now

Right - been a mantra of mine over some odd 20 pages in this thread: There's a limit in how far N this thing could trend in the runs. Those N solution - NAM a separate matter ...hold on for a minute - were really pressed against the proverbial wall and could only come S. That was proven true when every next cycle subsequent of a N solution, halted or went the other direction. I guess some 'wiper blade' aspect but ... you know - the whole needle threading track oscillation noise. The way around that N limitation would have/need to be a change in the (bold abv) scaffolding. But that's not happened yet, nor is there very much room in the hemispheric mode anchoring to assume any trend gets under way. If anything, this may come S even more - but cross the bridge. The NAM? That idiot was just handling the total synoptic manifold differently, including that larger mechanical exertion - enough to allow it's solution. But like you said all morning, it's the only run really doing that and beside... Man, the NAM has a W-N bias at time ranges beyond 48 hours. It's funny - it's almost like it's gotta bias NW so bad that it re-engineers the circulation mode to get to it's obsession LOL

step 1 ... cold front. Appears to be passing my location here in Ayer. Dark line of cu with wind shift and gustiness... 69 to 63 almost immediately

Oh, you must be referring to that comment I snarked last night. I meant that in deference to that particular run, ...as in, the RGEM's rendition sucked. The model may in fact suck, in general. But I'm not I don't use it? I get the sense for those that do, and comment on it... that it may have patterns it does better in. This season may not have featured very many of those -

Using the old NAM FOUS metrics from years ago ... BOS 48048969471 07926 240917 42999399 54067989425 02209 090812 48000004 Looks just about split between snow and IP at Logan. That first 48 ( at 48 hours there ) is QPF in inches, falling through 980 = -1C, 900 = -7C, 800 = -1C That -1C at 800 does argue for an elevated warm layer, but as we've collectively noted...the NAM is a bit of a NW outlier... (*the model typically is at this range*) ... These #'s don't evince temperatures above the 800 mb sigma. The second line is .67" QPF in isothermal to 800, where that is +4C(39ishF) ... Probably that is toasting aggies at that temperature. Considering that leading up to the point in time ( 54 hours) there may have been a couple hours where it was at or warmer than this just above that 800 mb level. So that is likely IP ...and a goodly dose of it at that. Looking at ALB's numbers ...they stay below 0C at all sigma levels on their grid... so... the classic (technique+experience with synoptic features in play) / 2 connotes snow along Rt 2... with and IP intrusion to the Pike or just N of that latitude. By the way, this is mostly a latitude oriented affair when it comes to that.

Yeah the biggest issue is snow total vs sleet cutting that down from where I'm sitting. I gather that folks would rather not the sleet... lol. Anyway, I'm more into this for the general impact to society, much less the general impact to the delicate sensibilities of people trying to get to some dimension of nostalgic d-drip psyche for the modeling journey before it even happens. I mean, sometimes I wonder if that journey is more important than the actual storm itself. This engagement has evolved into something ( I wonder ) that is a part of that "60 Minutes" psychotropic stimulation addiction shit they covered as a problem to humanity by modern technology. But that'd be digressing... I'm probably not really qualified to get too embedded in snow vs IP... In principle this is a "needle thread" system. And the system is going to run along the "rail-system" where the run lays the tracks - if the larger synoptic manifold change < 72 hour out..that's more an indictment of modeling tech. And the ptypes are 'edgy'

yeah... yeah I know. Stopped short at venturing why - it's about as eye-rolling at the reader's side, as it is poking the hornet's nest to impugn the writer of that voice - best to just skip it, because it's never ended well. I mean no one since the beginning of on-line weather "forumdium" has ever said, "gee, you're right - I'm being flawed logical in order to ameliorate my neurotic agenda. I'll cease from such tact.. " Uuuusually doesn't end well in the exchange. One is just not likely to be influenced, or corrigibly gathered in once they are triggered.

Not sure I see why the UKMET is presumptively wrong, but okay.. Seems a bit impulsive. This event's coverage this week has been rather revealing when it comes to load-balancing group pessimism vs optimism. The group tends to merely register a colder appealed cycle, but look out! We're making failure declaratives at the slightest giga motion of noise - that cannot be avoided at 72 hours lead btw. The hyper focus to do so makes autistic savantism look like ADHD. Lol - Anyway, I still think the QPF is handling well. From the get go, some 5+ days, pretty remarkable synoptic consistency. There have been two distinct synoptic metrics in all guidance that really support QP going above the 'SWFE climotology' QPF suggestion. -- deep latitude +PWAT air source -- ancillary jet mechanics with superb lateral exit jet between 500 and 300 mb overarching N of the baroclinic wall/wave as it ripples underneath. The 500 mb is between this latter feature, and that upper air accelerating wind field. This should aid in propelling UVM slots and ( I believe ) we may see this punch into a deeper GZ than people think - possibly even as a modest behavior bust. ...this latter aspect is experimental... just sayn'. That's an extreme jet construct though. ...I suppose we should add fact that the idiosyncrasies of this set up has a polar high uniquely situated to really maximize BL resistance. This will have a compressed thermal packing closer to the boundary... Dry sleet affair where that happens. Also, I get the whole warm tongue stuff with a 10000 foot sleet column routine, okay - but this won't likely produce that kind of elevated layer. It doesn't have that kind of mechanical thrust between 850 and 700 to do so. This is unique in a sense ...it is maximizing QPF mechanics by accentuated lift of a higher PWAT air, out of less WAA above 1300 meters. This is the way it has looked to me for days. I'm pretty set on NWS snow chart - I like what they've got. 8-12" along Rt 2 ...with a smear down to Brian... and points N (ratio inflation notwithstanding). 6-8" along the Pike, increasing sleet contamination S. 4-6" with sleet and ZR ~ HFD - PVD ... 1-4" S. Shore with ZR/IP. Cape as usual will require an intervention by a team of specialists

We actually had that here, that 5 .. 6::1 sleet bomb, from that event that was... jeezus, fore' or aft the blizzard. But we had it climbing up the tire walls in driveways and plow-able deep. I was dweebing it checking out the particulates in the pack on top of the car and could not find a snow aggregate, yet it was like 4"

The QPF is not likely to narrow out and drop off so dramatically over S VT/NH like that with all those upper air mechanics. Tossed

RnotaGEM

That model is a pos

Who cares. 9” is 9” heh

That ICANT model would drop about 15” along EEN to ASH

Don’t have a problem with colder solutions at all… I wrote plenty of rational reasons and solutions why those colder solutions should be the ones to go with. Yet just because a couple of models tweaked north by whatever amt we automatically have to go with that… ?Sounds a little neurotic to me without having any specific reasons to assume that’s the case. And I don’t buy just because the vmax is n. Plenty of examples of all snow overrunning events where that was the case in the past. Wind max is not really overcoming the llv boundary resistance; it’s going to be a deeper colder air mass; the overrunning is going up a steeper slope. Think that it’s as north as it can go in those north solutions. The only way it can go north is if the scaffolding/confluence significantly changes. That’s certainly possible …will have to see

I’d have to beat 12 inches in a single dose for that to be true at this location northern Middlesex county

that 4-6" band down there could be the higher impact, too, with a mix of IP/ZR integrating that at 27 F

Guys ... Euro run is within the latitude of noise/margin for error for this range with some to even spare. There's really no need for reactionary - Aside, I bet dimes to donuts it's a pube south and outlier wrt its ens mean. The GEFs/oper GFS is my package of choice for this day. We'll see what future cycles do... 18z Euro goes tick S more, then tomorrow it goes back ... blah blah ..rinse repeat XANAX - thank you for playing the d-drip two step

That's actually impressive for an ensemble mean - even at 3 to 3.5 days lead. Obviously there is less divergence between the operational and the respective members that weight that average. ... heh. wow. But the > 6" being in the 90th percentile or higher at this range may be both one helluva testament to modern modeling technology, but a red flag to take this seriously. Ray or whomever mentioned the last hour may be right that this could either rival or become the better performing system for the season thus far, for the interior Pike to southern NH region. I also don't want to leave out the CT-RI crew. I think this can pin a ZR axis, with a roar of sleet/snow mix rolling off roof eaves and piling up along tire hubs just N. Not sure if that will reach warning criteria ice where does, but it's a nasty event down there too.

Yeah ... now for some attempts at sensible caveats. I realize my tenor has been rather bullish this morning - not just me! Look at the f'n models... But, the speed in which this event is translating through is nothing shy of an unsung amazement in this modeling cinema. It's actually sped up in the last day .. day and half -worth of runs. The primary seclusion --> "secondary" ( if we wanna call it that ...) commitment --> escape sequencing covers some 400 miles of x-coordinate distance from 06z to 18z Friday ... That's insane. The rad is going to be sending pixelation at haulin' ass speeds. That may limit this. Scott also brought up a very good point about the longitudinal aspect of the open wave, tending to currier the mid level lift away at bit of an acceleration over the model position of QPF. We have to remember when looking at QPF charts: that means as of the moment the chart is drawn... What that means is that it may not actually be coming down as hard as the QPF looks at that hourly/time in question - it could already be in the books. This situation could snow 4-5" ...maybe 6" in the IB/front-side, then 3-4" on the quasi CCB as the low is escaping. We go above QPF, but not hugely so, due to these offsets. J