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NYC/PHL 12/21-12/22 Threat


hazwoper

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Not sure if I would call this "flat and progressive"

http://www.nco.ncep....fs_500_156l.gif

Yeah, the northern stream is just screaming down the back of the PNA ridge. I like this threat more than others so far because we have a well-defined +PNA and still some good blocking on the Atlantic side. The energy in the Plains looks much juicier and there's a lot of cold air available at this time frame.

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Yeah, the northern stream is just screaming down the back of the PNA ridge. I like this threat more than others so far because we have a well-defined +PNA and still some good blocking on the Atlantic side. The energy in the Plains looks much juicier and there's a lot of cold air available at this time frame.

Exactly, although the PNA ridge is a bit displaced, I dont get all the negativity, this setup is really nice with the Euro Ens/GFS agreeing on a near BM track. Still too far out, but were not dealing with a bunch of small vorts that need perfect phasing, like last time, so I'm a bit more confident at this range

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GFS ensemble mean has .25"-.50" line for all of Suffolk

County, LI and the .50"-.75" line for the forks of LI.

.10"-.25" is from eastern Jersey, thru NYC and on east.

This is well west of operational.

Thats about how much it had for a good part of the area for the 2/5 storm...of course this is a totally different setup....there was a good description about the entire thing in the New England thread by one of the posters....basically those semi-secondary or NW low centers the NAM and GFS are both sort of indicating on their runs which bring the precip near LI would need to become the dominant low center for the storm, if that happened we would see one of the worst modern day forecast busts.....at this point its hard to say why the models are showing those semi low centers to the NW...as one poster said it could be the model is seeing the inverted/norlun trough feature and sort of overdoing it...or it could be having some sort of convective issue...

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Thats about how much it had for a good part of the area for the 2/5 storm...of course this is a totally different setup....there was a good description about the entire thing in the New England thread by one of the posters....basically those semi-secondary or NW low centers the NAM and GFS are both sort of indicating on their runs which bring the precip near LI would need to become the dominant low center for the storm, if that happened we would see one of the worst modern day forecast busts.....at this point its hard to say why the models are showing those semi low centers to the NW...as one poster said it could be the model is seeing the inverted/norlun trough feature and sort of overdoing it...or it could be having some sort of convective issue...

We'll see what tonights 0z models do. If NAM and Srefs come in west again, there's a good shot of accumulating

snow. Especially Huntington east.

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If the 18Z NAM and many of the 18Z GFS ensemble members verified dead on it would be a very frustrating sunday afternoon and evening for many of us...basically a miss by 75 miles.

A few days ago I posted about how I had a feeling this would happen...and that's why I haven't been watching the last day or two. Extremely frustrating.

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Just finished my Sabbath and been outta the loop: Are some people still hoping something happens tomorrow? If yes, what are the chances and how much are people hoping for? The only thing that may make me even consider hoping for a surprise tomorrow is the fact that the set up is overall very complex right now, something too hard for models to get down, and maybe just maybe things will come together for a little bit of something. But overall I've moved on and looking forward to seeing what the Xmas storm may bring us.

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Not a RUC fan, but just looked at 23Z RUC hour 15, 22Z RUC hour 16, 21Z RUC hour 17, and 20Z RUC hour 18...the low and precip appears closr on each ensuing one...also the 23Z RUC shows a closed 850 low center as well at hour 15 when the others did not.

yea the 23z RUC at 18h is actually rather nice, throws precip over all of the southern half of new jersey. Dont know how this model performs at this range though

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yea the 23z RUC at 18h is actually rather nice, throws precip over all of the southern half of new jersey. Dont know how this model performs at this range though

I'll emphasize as well, the direction of motion on that the three hours leading up to this frame is about 340-350.

http://www.nco.ncep....uc_slp_018m.gif

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I would think that the precipitation would have to start taking more of a NW movement since looking at the radar ..all the precipitation is just about off the coast already...and looks to be pressing East Northeast

Based off water vapor, the deepest moisture is also racing ENE and not swinging back to the NW

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