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Weekend Threat 12/14-12/15


IsentropicLift

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Hour 120 sub 996mb low east of Cape May, NJ. NW areas getting raked by a CCB. NYC south and east mixing or rain.

both gfs and euro been trending east , do you believe that it could change to all snow and no mixing issues for the coastal areas considering its going to be so cold?

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Agreed, just has the feel of a big hit with this setup. And the cold air mass out ahead of it is awesome.

You really don't need a -NAO in this kind of setup. That massive PV is acting like a block on its own. We just need to keep the promary further south with more offshore development.

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I said this morning , it was good to see the models converging on a fresh artic high arriving 24 hours in advance of the system

Into New England. Because without a neg NAO not allowing the high to retreat the next best thing is to have early secondary development

And capture some drainage of cold air ( as long as u can keep a NE wind )

2 things. This has been trending our way since yesterday at 0z and it is 5 days out ,

b cautious. They are only operational model runs. I do like the trend though.

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And to think just a month ago we were all praying for rain, not even snow and now we have had multiple systems to track in the span of 2-3 weeks. This just gives me hope for this upcoming winter.

The pattern has done a complete 180 over the last several weeks. We are getting a lot more southern stream involvement this year. With the PV on our side of the globe and plenty of cold air, it could be quite an exciting pattern going forward. I still would like to see the Atlantic cooperate more especially after the holidays. All in all not a bad pattern!

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Big difference is that yesterday the models had more interaction with the northern stream shortwave resulting in a more phased up wound up system, if you look at the 12z Euro/GFS   today the southern s/w really speeds up ahead of the northern stream piece trying to dive in, resulting in more of a dominantly southern stream system. Still though I would lean against this being a major snow for the coast because of a lack of blocking keeping a high pressure system locked in to the north. I think  12z GFS scenario of snow to sleet to zr is more likely for the NYC area, especially just to the N&W/WSW away from the UHI. 

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I can't but this whole area was in the 6-8"+ range. The city eastward is more of a 4-6" type deal. I think those numbers look on the low side to be honest.

Wxbell snow maps look very generous for pretty much everyone in the area, but from what I heard they're usually overdone? 

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Notably, on the GFS, wind remains NE...never goes S or SE, meaning warmfront from primary never makes it through the area as coastal takes over. There have been times in the 2000's of having primaries head west of NYC, and coastal front takes over and snow falls instead of mixed bag. The key to the modeling that few have latched onto this early winter season is that the cold has been under-modeled.

Hopefully I'm wrong, but I can see the primary low hanging on longer because of the lack of 50-50 low. Hopefully it becomes a trend over several runs that the primary dies soon. And maybe some semblance of blocking/resistance over SE Canada would be awesome.

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Hopefully I'm wrong, but I can see the primary low hanging on longer because of the lack of 50-50 low. Hopefully it becomes a trend over several runs that the primary dies soon. And maybe some semblance of blocking/resistance over SE Canada would be awesome.

What is this fetish with a 50/50 low as if it's impossible to get a big snowstorm without one?

 

The positioning of the arctic jet is doing all the dirty work here. Would it be nice to have something to lock in that high better? Yes, but then you start to walk the fine line of suppression.

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