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December pattern change continued


Typhoon Tip

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For that setup it is. Funny that the other models kind of lost it. The ensembles looked like it had good ne flow too.

If you followed every non-Euro model, you'd predict flurries for the Cape, but the Euro shows legit like 2-4" for Phil..,and even like upslope in ORH hills.

It will be really interesting to see which group caves first.

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With respect to the lack of sustained cold or wintry threats, I have become uncharacteristially stoic. Are we going to have a deep freeze this year? Perhaps not (certainly the CPC map that was posted says not). Block-buster storms? Perhaps not, but one wouldn't have expected one in October regardless of what pattern was set up.

We will have wintry cold. We will have wintry precip. If it's an off year, just enjoy the periods of winter we get.

Good luck to Phil and the Capester's, and who knows how next week wil evolve. Maybe something a little white than expected if the boys and girls on the weenie-board have been good.

39.4/33, breezy.

EDIT: Case in point--not a beautiful winter forecast, but enough to remind you that in fact it is:

MAZ002-162100-

WESTERN FRANKLIN MA-

INCLUDING THE CITIES OF...ASHFIELD...CHARLEMONT...COLRAIN...

SHELBURNE

417 AM EST FRI DEC 16 2011

.MONDAY NIGHT...MOSTLY CLOUDY WITH A 30 PERCENT CHANCE OF SNOW

SHOWERS. LOWS IN THE UPPER 20S.

.TUESDAY...PARTLY SUNNY WITH A CHANCE OF SNOW AND RAIN SHOWERS.

HIGHS IN THE UPPER 30S. CHANCE OF PRECIPITATION 30 PERCENT.

.TUESDAY NIGHT...MOSTLY CLOUDY WITH A 40 PERCENT CHANCE OF SNOW

SHOWERS. LOWS IN THE UPPER 20S.

.WEDNESDAY AND WEDNESDAY NIGHT...MOSTLY CLOUDY WITH A CHANCE OF

SNOW AND RAIN SHOWERS. HIGHS IN THE UPPER 30S. LOWS IN THE UPPER

20S. CHANCE OF PRECIPITATION 40 PERCENT

39.0/33

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I would be pumped if I were on the Cape, one of the best setups in a while.

OFFSHORE CYCLOGENESIS COMMENCES THIS PERIOD WITH OCEAN EFFECT SNOW

SHOWERS/SQUALLS LIKELY ACROSS CAPE COD AND NANTUCKET AS MOIST NNE

FLOW COMBINES WITH COLD CYCLONIC FLOW ALOFT. IMPRESSIVE LOW LEVEL

INSTABILITY DEVELOPS WITH 850 TEMPS LOWERING TO ABOUT -14C AND SST

RELATIVELY WARM AT +8C.  DELTA-T OF GREATER THAN 20C TYPICALLY

RESULT IN ACCUMULATING SNOWS. NAM BUFKIT SOUNDINGS AT CHH AND ACK

REVEAL MODEST INSTABILITY PARAMETERS OF OCEAN INDUCED CAPES OF

600-700J/KG AND NCAPES GREATER THAN 0.20! MODEL QPF IS ABOUT 0.10.

THIS COMBINED WITH COLD TEMPS ALOFT WILL LIKELY YIELD SNOW RATIOS OF

ON THE ORDER OF 15/1 TO 18/1. THEREFORE AN INCH OR TWO OF

ACCUMULATION IN THE HEAVIEST SQUALLS ARE POSSIBLE. GIVEN THE

MAGNITUDE OF THE INSTABILITY/LACK OF SHEAR IN THE BLYR AND THE

ABSENCE OF DAYTIME HEATING TO DISRUPT BAND CIRCULATION A LOW

PROBABILITY OF ISOLATED 3-4 AMOUNTS EXIST.

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Models are kind of all over the place for the Cape stuff which is kind of weird. I wish the NAM and SREFs had a stronger signal. Still, the euro has been pretty steadfast, so the potential is there.

yeah kind of funny to see the globals picking up on this (perhaps more related to the inverted trough coming off the western flank?) and the NAM not seeing it as much.

the euro would even be a dusting to an inch into BOS as it has like .07" into BOS...it's got .3" at HYA.

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What are people's thoughts on christmas week temps? The stubborn GFS has been persistent in the idea of at least "normal" temps along the eastern seaboard. However, the Euro briefly picked up on that idea and now looks to be trending warmer again.

Do we automatically write off the GFS and assume surface temps will come in warmer than normal because of the trend? I hate to do it, but I'm rooting for the GFS, at least normal temps would seem like a godsend given the recent catastrophe.

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yeah kind of funny to see the globals picking up on this (perhaps more related to the inverted trough coming off the western flank?) and the NAM not seeing it as much.

the euro would even be a dusting to an inch into BOS as it has like .07" into BOS...it's got .3" at HYA.

Meso stuff like this is so fascinating. The parameters are certainly in place. Take pics

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What are people's thoughts on christmas week temps? The stubborn GFS has been persistent in the idea of at least "normal" temps along the eastern seaboard. However, the Euro briefly picked up on that idea and now looks to be trending warmer again.

Do we automatically write off the GFS and assume surface temps will come in warmer than normal because of the trend? I hate to do it, but I'm rooting for the GFS, at least normal temps would seem like a godsend given the recent catastrophe.

It still looks overall warmer than normal, but there might be a few interludes of colder air..like maybe on the 22nd and 25th.

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It still looks overall warmer than normal, but there might be a few interludes of colder air..like maybe on the 22nd and 25th.

It's way out there, but the Euro has some very strong low level cold with that HP Christmas morning...-10Fs up into N ME. Hopefully we'll have some of that to work with for any threat with relatively lousy 850s.
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At least it will be great to hear people complaining about how cold it is on Sunday while Christmas shopping.

Cold weekend on tap, Probably one of the better looking 0z Euro runs in over a week, At least there is a couple thread the needle events to follow which could produce up here..

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