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December 2019


NYCweatherNOW
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Pre-Xmas storm has my interest more than anything right now, but my worry is that we tearfully watch it bomb out over the Flemish Cap.  If we somehow can toss some sand in the gears of that PAC jet, things could get interesting.  We deserve it after enduring last year’s garbage pattern.  Got my fingers crossed!

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8 minutes ago, White Gorilla said:

So much time for models to make sense 10 days from now and a lot of details to sort out.  If we can establish fresh arctic air first, half the battle is won. Just need the precip.  Even if we don't get a KU, a clipper snow event with 2-4 inches in arctic air would be wonderful for the Christmas mood. 

Yeah even a couple nickel and dime events with below normal temps would be a great break from the Easter-in December weather we've had so many times this decade..

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31 minutes ago, RedSky said:

So the pack it in it's going to be a mild start to the holiday week the ECM has been showing now spits out near record cold. What is wrong with guidance these days these flips are gargantuan?

 

The East Asian Jet extension and fast flow into the West Coast is probably too much for the models to correctly handle.

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42 minutes ago, Gravity Wave said:

People are really starting to talk about the 12/21-23 period for a major snowstorm. The setup mostly looks great but the ridge axis positioning is definitely concerning. 

The EPS has a low coming through the Great Lakes with cold high pressure behind it. Ridge axis would be too far east for a major storm. May be tough to back that ridge far enough west with such a fast Pacific Jet.

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12 minutes ago, White Gorilla said:

Hoping we can switch from soakers to paste jobs in the coming few weeks 

It doesn’t seem like the Pacific is in a hurry to let that happen. Last few runs shifted warmer and more amplified for the second storm early next week. The models seem to be playing catch up with the very fast Pacific flow.

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6 minutes ago, bluewave said:

It doesn’t seem like the Pacific is in a hurry to let that happen. Last few runs shifted warmer and more amplified for the second storm early next week. The models seem to be playing catch up with the very fast Pacific flow.

EPS trending stronger with the blocking though. Will be interesting to see how these pieces counteract each other.

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Just now, SnoSki14 said:

EPS trending stronger with the blocking though. Will be interesting to see how these pieces counteract each other.

My concern is the the fast Pacific flow pushes the ridge axis too far east for a decent storm track. While the day 8-10 means have come in colder than a few days ago, that ridge could eventually shift back over the area day 11-15. We really need extreme Atlantic blocking to counter an unfavorable Pacific.

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59 minutes ago, bluewave said:

My concern is the the fast Pacific flow pushes the ridge axis too far east for a decent storm track. While the day 8-10 means have come in colder than a few days ago, that ridge could eventually shift back over the area day 11-15. We really need extreme Atlantic blocking to counter an unfavorable Pacific.

Yep. That was the problem last winter. Everytime a +PNA ridge formed, the raging fast PAC jet slammed into it and knocked it right down. When the PAC side sucks, in the absence of a very strong Atlantic/west-based -NAO “Greenland block” (and you’d also want a strong arctic -AO/-NAM along with it as well), the PAC rules the day, since our weather moves west to east. The PAC will always overrule the Atlantic and arctic in the absence of a very strong block/blocks

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