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Oct 29-30 snow threat


Typhoon Tip
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I wouldn't expect any surprise solutions. From here on out, you'll want to see some bumps north and corrections that we noted in the s/w down south. You'll want that to maintain a sharper orientation and have it a bit further north for anything more than flakes or a coating. The whole system seems to have gotten a little more robust and further north on the 12z runs today. You won't see any massive shifts this close in, but they'll likely be more "bumps" north...especially with the second part on Friday morning. Speaking more for SNE here.

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Fwiw - 

I've been a fan/user of the NAM FOUS ...since back whence it was once the 'ETA' product in the early to mid 1990s, and I can tell you that these grid numbers are snowing a pretty good clip ( most likely ...), certainly .. relative to climo of premie 'Ween events those adjectives are true.  Particularly visualized west of the city of Boston out over that first set of hills ( Arlington Hgts ...) out toward I-95... western side of Waltham/Newton ..up toward Burlington, down a ways ...but not sure when SE contamination plays in ... But those areas or probably over to moderate parachutes in this profile

 

BOS                                 LGA
36031989751 08119 090417 54070100   36073989822 12609 020425 64070410
42068967727 11922 070329 52049999   42026955927 02616 040321 57060107
48021959143 05718 100224 42009798   48024979244 -9214 090220 45020099
54015614124 -0519 140115 36019595   54010795313 -2212 153611 40040097
60000412219 00618 203508 32039695   60000765509 00719 213405 37060096

Even down near NYC is flipping/ed to snow at 48 hours... certainly fatties mixed in.

But, the 'fanship' kicks in for me < 36 hours ...so - given to 'subtle' bumps N and Chris' mentioning that the spread was oriented back this way, I'm 'subtly' impressed by these sigma values centered on D 2

 

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4 minutes ago, CoastalWx said:

The bump north with part 1 is actually better for you guys. 

Yeah that's where their snow will come from....unlike a couple days ago when they were getting the heavy stuff from part 2 on some of those runs. Part 2 is getting shredded and if it produces, it will likely only be for SNE and maybe southern CNE.

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Just now, dendrite said:

Really need part 2 to bomb out to get that isallobaric flow cranking to advect in that low level cold air. The more meh it is, the more meh the LLVL CAA is.

Yeah part 2 was the source of most of the snow in all the previous runs....there's a little bit of part 1 snow way up north on more recent runs, but we really want part 2 to crank to give some legit heavy snow....that CAA you talk about also enhances the frontogensis which would drive that heavier snow.

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