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December 14/15 winter storm threat


Typhoon Tip

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I think we'll just see this go back and forth for the next 24-36 hours...seems relatively locked in but the minute details won't be sorted out and as always, these things are essentially a nowcast.  The overall appeal of this system seems to stay the same though...its just weather it goes over the Cape over ACK or towards the Benchmark... I know it has big sensible weather changes for some of you guys in SE New England, but its essentially a nowcast.  Usually I'd lean SE on these, but with no real blocking and a tendency for a SE ridge so far this young season, it may be able to do a near the Cape track. 

 

Either way, this is a widespread snowfall for just about all... can't complain about that.  Everyone (except maybe the south shore) should end up with more snow on the ground than they started with and that's all that matters.

 

The interaction of the s/w digging down and the two coming out of the sw....I'm surprised by how much ALL models are moving those features around/speed/intensity.  Unusual for the GFS and Euro.  Once it does turn the corner and come at us it has to head into brutal cold air.  I would still lean east of the tracks we're seeing today but you never know...the cone probably has a left bound somewhere over my head and extends out halfway or so to the BM.

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If that NAM solution at 500mb plays out with a v-max strengthening in a negative orientation as it speeds over ISP, there is going to be one helluva frontogenic band or two oriented from roughly HFD-BED.   

 

Also, this thing might thunder -- hmmm

 

Everyone keeps ripping the NAM but some of the ideas it's had were supported pretty well by the ensembles and later op models as noted by NCEP today in the diag.

 

AT THE

SURFACE...ONE LOW WILL TRACK UP TO THE OHIO VALLEY...AND THEN A

COASTAL LOW WILL DEVELOP OFF THE MID ATLANTIC SATURDAY NIGHT.

LARGE SCALE MODEL AGREEMENT IS QUITE GOOD...WITH NO OUTLIERS. THE

12Z NAM IS JUST SLIGHTLY SLOWER WITH THE COASTAL LOW. THIS IDEA

ACTUALLY HAS DECENT SUPPORT FROM THE ENSEMBLES...WHILE THE

OPERATIONAL GFS/ECMWF HAVE BEEN SHOWING SOLUTIONS THAT ARE A

LITTLE FASTER THAN THE ENSEMBLE MEANS. WHEN VIEWED AGAINST THE

FULL 12Z MODEL SUITE...THE NAM 850 MB SOLUTION MENTIONED IN OUR

PREVIOUS DISCUSSION NO LONGER LOOKS LIKE MUCH OF AN ODDITY...AS

ALL MODELS PRODUCE AT LEAST A 50-60 KT LOW LEVEL JET AHEAD OF THE

COASTAL LOW. IT WOULD APPEAR THAT THERE ARE NO MEANINGFUL

DIFFERENCES ON THE SYNOPTIC SCALE...AND NO CLEAR REASONING TO

FAVOR ONE SOLUTION OVER ANOTHER ON THE MESOSCALE...SO A GENERAL

BLEND IS RECOMMENDED

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Everyone keeps ripping the NAM but some of the ideas it's had were supported pretty well by the ensembles and later op models as noted by NCEP today in the diag.

 

AT THE

SURFACE...ONE LOW WILL TRACK UP TO THE OHIO VALLEY...AND THEN A

COASTAL LOW WILL DEVELOP OFF THE MID ATLANTIC SATURDAY NIGHT.

LARGE SCALE MODEL AGREEMENT IS QUITE GOOD...WITH NO OUTLIERS. THE

12Z NAM IS JUST SLIGHTLY SLOWER WITH THE COASTAL LOW. THIS IDEA

ACTUALLY HAS DECENT SUPPORT FROM THE ENSEMBLES...WHILE THE

OPERATIONAL GFS/ECMWF HAVE BEEN SHOWING SOLUTIONS THAT ARE A

LITTLE FASTER THAN THE ENSEMBLE MEANS. WHEN VIEWED AGAINST THE

FULL 12Z MODEL SUITE...THE NAM 850 MB SOLUTION MENTIONED IN OUR

PREVIOUS DISCUSSION NO LONGER LOOKS LIKE MUCH OF AN ODDITY...AS

ALL MODELS PRODUCE AT LEAST A 50-60 KT LOW LEVEL JET AHEAD OF THE

COASTAL LOW. IT WOULD APPEAR THAT THERE ARE NO MEANINGFUL

DIFFERENCES ON THE SYNOPTIC SCALE...AND NO CLEAR REASONING TO

FAVOR ONE SOLUTION OVER ANOTHER ON THE MESOSCALE...SO A GENERAL

BLEND IS RECOMMENDED

 

The issue with the NAM is what its past two runs have done... the consistency.  One run it put the 850mb freezing line into CNE, the next a CCB over the Cape. 

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Not sure why the South east and cape people are so bent out of shape, it rains down there at some point for most storms....that's why my folks retired down there and not near powderfreak

Huh. Whose bent out of shape from down here? I think most of the whining is coming from some inland peeps who might see a sleet pellet. I'm looking forward to a front end 3-5"

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All the Boston mets seem to have a similar snowfall map at this point ... 3-6 inside of 128 including Boston and extending west just south of the MA border and just N of 84 with 5-10" for all areas northwest of that line, and 1-3" for the cape and islands SE of PYM and along the south coast.

 

Overall it seems pretty reasonable. My area to Jerry are probably  in a battle zone depending on how the coastal front takes shape. I'm thinking 4-8" currently for this area.

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:weenie:

 

If people can just accept that this is more of a WAA thump...erase the jackpot fetishes and just enjoy some snow...then sanity may actually dominate. Alas, this is AmericanWx and the notion of this materializing is slim to none.

Would be fine if it were really a thump.  In recent years, CT and MA got all the thumps while places NW just snizzled. 

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Would be fine if it were really a thump.  In recent years, CT and MA got all the thumps while places NW just snizzled. 

 

Your area looks good. Should be decent banding there too. And I don't know how you think the NAM isn't funny. Just think back to the last 24 hrs, and then look at this solution. Sure it has an outside shot of being viable...but the model sucks.

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I don't get what was funny about it.  Looks plausible.  Some mixing issues to the south.  Might be a bit too wet overall.  Trouble getting snows going on Sat.  Coastal impacts primarily SE areas.  All the things I'm worried about :P

 

Looks like it fell victim to some convective processes to which it's supposed to be immune...

 

GGEM Ens have been steady will be interested to see what plays out.  I don't buy the heavier snow NAM solution here.  1-3 seems safe, maybe 2-4 if it comes together in later runs. 

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