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Days and days of snow disco


Damage In Tolland

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Can’t have both. Wed hit, Thursday east.

Timing is better for second wave but lead wave will compress heights behind it, shunting it well east.

Flow is progressive along the east coast for wave one, but I do think there’s some room for modest improvement in that regard due to a precipitous drop in the NAO between now and the 17th, from ++NAO to +NAO/neutral. 

Right now I like widespread 6” amounts across eastern New England as a highest confidence number, with maximum (low confidence) potential of around 10” for wed.

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Here's BOX initial thoughts on Monday OES.

Quote

The main focus on Monday will turn to the mesoscale and potential
for a few inches of localized snow accums.  Given the strong high
shifting into eastern Canada an easterly 925 mb LLJ of 20 to 25
knots will develop.  Meanwhile...a mesoscale coastal front will
setup probably near the Plymouth county coast.  Surface temps might
be in the upper teens and lower 20s to the northwest of the coastal
front...while portions of the Cape/ACK will likely see temps rise
above freezing. This seems to be a very good setup for ocean effect
snow showers with 925T between -8c and -12C along with added
enhancement along the coastal front and help from the land/sea
interface.  While a coating to 1 inch of snow will be possible
across eastern MA and even into portions of RI...the main focus will
likely run from Boston/s south shore and into Plymouth county along
the coastal front.  Cape Ann may also be impacted by this mesoscale
snow as well. Snow accumulations of 1 to 3 inches are certainly
possible in this region with the low risk of very isolated 4-5 inch
amounts. This could potentially impact both the Monday morning and
afternoon commutes...especially on the highly traveled Route 3
connecting Boston to the south shore. While we are not confident
enough in amounts to issue a winter weather advisory at this
time...will go ahead and issue a special weather statement to
highlight this potential.

Meanwhile...not too far northwest of the BOS-PVD corridor probably
will not see much more than flurries.  High temps will mainly be in
the lower to middle 20s...except near or above freezing near the
Cape Cod Canal and Islands to the southeast of the coastal
front.

Tuesday/Wednesday Storm

Quote

Tue into Wed...
A slight convergence in deterministic guidance will also be
noted with this update, but will continue with means. The
initial, moisture starved clipper with MSLP near or above
1025hPa looks to lose even more as the attendant wave, the PV
anomaly mentioned above opens and gradually shifts toward near
neutral status. This looks to yield offshore cyclogenesis along
the weak stalled frontal boundary. This secondary low pres track
will determine final snowfall totals, as PWATs increase to near
0.4 inches, which, although above normal, is generally less
than 1 std deviation above normal. Lift is weak, and not always
focused within the DGZ, even as the precip shield in advance of
this secondary low overspread S New England. Operational total
QPF values rang from about 0.25 to 0.5, and ensemble means
support this. So may need to watch for an advisory lvl snowfall
late Tue into early Wed assuming the secondary low falls near or
inside the 40/70 Benchmark (ensemble clustering is close).
However, still enough uncertainty that thermal profiles could
warm enough along portions of the SE coastal plain to limit
snowfall, or that the track could be far enough shore to also
limit snowfall. These will continue to be better resolved. Temps
run closer to normal, but given the uncertainty in weak low
pres passage, there is enough uncertainty that temps may change
a bit especially across the SE, where warmer low lvl thermal
profiles are most pronounced.

And lastly Thursday which looks to be offshore at this time.

Quote

Thu...
The wave continues to open and shift E, orienting the trof-base
jet streak poleward exit region offshore of the mid-Atlantic
such that yet another, stronger coastal wave looks to develop.
Given the spread in the initial wave, there is even more so with
this wave. ECMWF is still the most amplified, with enough W
draw to influence S New England yet again on Thu, but several
ensemble members from both the GEFs and ECENS are offshore. Will
need to watch the how the PV lobe is handled as it is better
sampled, as this could prolong the period of wintry precip. This
also marks the peak of the cold dome as the opening wave begins
to lift to the ENE.

 

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28 minutes ago, 25thamendmentfan said:

Does anyone have the stats on the epic February 1993 oes snow bomb that hammered the cape with 20+ inches?

It was enhanced by a norlun trough. There's actually a paper that came out years ago by the inventor of the norlun phrase that mentions the event in some detail. 

http://www.weatheranswer.com/public/NORLUN2.pdf

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OES snow may be the perfect December 17 theme, adding specifically to the mise en scene of the mental Holiday cinema. But, other than the symbolism and nostalgia out the window, while shopping or glancing up during NFL timeouts ...it doesn't mean much else.  OH, sure ... in a narrow band in Plymouth someone ends up enraged for this statement ... Excluding the delicate sensibilities in that person's backyard, it takes a pretty extraordinary set of environmental circumstances to be much else. 

NAM's trying sharpen up and close off the southern component of the mid week amplitude again ...as I am sure others have pounced on.  That almost reminds ... tho not an analog per se, the general behvaior, that it could close off and get some rigorous cyclogenesis close enough to clock the M/A as it exits...then meandering as it fills on out to sea, much like that bigger more intense version of that total behavior which took place last year. That system brought blizzard conditions to the M/A to about NYC and LI...while perhaps advisory to the Pike.. .but ultimately, didn't come "up the coast". 

Again, I am not saying this system is an analog ...or that it will even do that, just that I could visualize where the NAM would end up with that mid level pinch.

 

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