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The Winter 2010-11 NYC/PHL Medium Range Thread


am19psu

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I'd say our next shot is 264/276. Theres some decent blocking w a 50/50 in place

Yeah def...I'd actually start watching a bit earlier around Day 8 as there's a really strong +PNA with some northern stream energy coming down the backside....definitely have got a 50/50 low and massive NAO but the GFS sort of shears it as it comes into Minnesota. Looks like it would be a Miller B threat, followed by some overrunning threats in the longer range towards the Holidays?

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Answer to this is easy: the Gulf Stream keeps London in a Seattle-type state of ocean-influenced temps (with the warm waters of the stream having a profound effect), overcast skies, and moderate precipitation.

Yeah, thats what I figured lol-- when you have a large body of water just to your west, you are usually screwed, because you have more of a maritime climate (because weather usually moves west to east.)  With a whole continent to our west, we are colder. 

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Just take a look at the overall pattern, and the setup of the northern/southern streams. In a pattern where there's no or transient blocking over Greenland and no 50-50 feature, it's hard right off the bat to have an all or mostly snowstorm in the coastal plain this time of year due just to water temperatures, and the tendency of storms to cut north once they get to our longitude. Storms tend to strengthen once they arrive east of the Miss. River and gain access to heat/H20 from the Gulf and Atlantic, and then try to cut north as they strengthen. You usually need some kind of blocking mechanism north of us to keep a storm southeast of us anyway. Secondly, during a Nina, the northern stream is dominant, meaning there are many more clippers than usual and storms that cut north than usual due to a pattern that favors a trough over the west/Midwest and ridging over the Southeast. The northern stream is also more energetic, making it even easier for storms to sharpen in the flow and cut north. That makes it even more essential that the cold air around here is locked into place to possibly force the storm to transfer to the coast, or force a southerly path. During strong Ninas like this, without a favorable pattern northeast of us to block up the fast northern stream-dominated storminess, it's very unlikely that we get a snow event near the coast. That's why it looks very likely to be rain or almost all rain near the coast this time. The only way I see that changing is if the clipper that comes before it strengthens and cuts off, forcing the next storm to move around to its south, or the Greenland blocking somehow stays in place. The good thing is, this storm for Sunday/Mon looks like it might be strong enough to force another block to develop, setting up a chance down the road. But without that in place this winter, it's likely rain for us right off the bat. Ninas favor the Lake effect snowbelts and the Midwest for a reason.

This is why Im wondering why everyone is talking about a amazingly negative nao and such strong blocking like we had last year-- and yet storms are still cutting?

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Looking at 5 days out ..there still is not really that much harmony in the models. I am not sure which one has been performing better ..but i found this kind of interesting..

UKMET 120

ECM 120

GGEM 120

Finally

GFS 120

One thing they pretty much all agree on is the overall 500mb pattern. Definitely an east based -NAO, which is why this storm is NOT going to be an east coast snowstorm. Afterwards the pattern looks more promising but remember we are fighting a La Nina, and if it doesn't start to weaken climatology is going to be pretty hard to beat....

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According to the 00Z GFS NYC has a legit chance at below 0 readings behind this storm...but of course we know even if its 850s aren't 5 degrees too cold...the wind will either be too northwesterly as opposed to northerly causing a downslope component or there will be too many clouds.

Unless the weekend storm tracks differently NYC won't hit zero without snow cover, Nick Stefano told me that Sussex County NJ even has a hard time getting below zero without snow cover in December.

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