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Coastal Storm Potential - Jan 11-12 II


Baroclinic Zone

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???

yes the theme is somebody rips hard for 6-9 hours...there's no question about that. the question is whether the NAM is on to something by targeting most of CT...or will it set up more in SE CT up through BOS...which seems to be more in line with the Euro.

Got it, you're talking max.

How much of "coop" is that NAM really scoring? It's moved progressively southeast toward the globals since 00z.

LOL every one is kind of dancing around the fact that your phase shift seems very much in play still. The main energy did shift east a bit this run even from the last one and it's the lobe of vorticity near the tip that keeps this in play for the NAM solution. It shifted enough this run vs the 0z last night that the back edge of precip in EPA and ENY in terms of the .5 got eroded east. That's been an error for a few weeks with the NAM on every system coming off the coast. When you look at the NCEP model verification page the NAM goes to shi* between 36-48 with the heights in advance of this system...too high in the plains. Same old same old. EC is a lot better, but so far take a look, for 48 hour verifications the GFS has schooled all other models in the plains. Doesn't mean it will continue, just saying. The GFS has done about as well as it could at 48. The NAM is the worst model we have running right now in terms of the ones used daily (not the nogaps).

Maybe this is the time the NAM "gets it" at 48 but I highly doubt it. Will look forward to the others.

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To the mets out there, is there the potential, like the 12/26 storm to have banding setup to the effect that there will be, what you guys call "screw-zones", where areas within 10-15 miles of each other will have drastically different outcomes or is this a completely different animal? Thanks!

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Soundings look great out west, don't worry about qpf...Mike.

The NAM still argues precip may become more "showery" for a couple of hours back here, but there is also some pretty good low level convergence going on, so that should help. In fact, it shows up on the 850-500 progs as a small area of enhanced lift. By 15z, the backside starts to come through. I'm only discussing what it shows.

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How so? The 700mb closes off south of CT.

mid level low makes a larger jump from PA / N MD to Cape Cod. So LI into CT gets smoked but as the mid level low jumps, the heaviest precip is pulled east, limiting the dump-duration over central MA. Extreme eastern MA still gets smoked too. The NAM's QPF even shows this signature. Might even verify more pronounced (IF this evolution verifies)

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To the mets out there, is there the potential, like the 12/26 storm to have banding setup to the effect that there will be, what you guys call "screw-zones", where areas within 10-15 miles of each other will have drastically different outcomes or is this a completely different animal? Thanks!

That happens in every storm, but it's too early to say where. We are still 48 hrs out and models may shuffle in either direction.

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If you had to rate which models handled the mid section of the country better at 48 hours vs progs...the UK and GFS did quite a bit better than the NAM and EC. Doesn't mean anything future isnt dictated by the past....I'm just pointing it out.

Thinking it through though the two wettest models having performed the worst so far would raise a little flag for the time being.

UK and EC verification

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Not sure why everyone is so thrilled with the 12z NAM. It's shown discontinuity, and a steady trend SE. This solution would probably be nice verbatim, but the "correction vector" is in the wrong direction

100% agree. Maybe the rest of the 12z suite will snap everyone back into reality mode.

It'll be right once, but it's not surprising that the models that busted in overamplifying things from the get-go are on the wet side of guidance.

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mid level low makes a larger jump from PA / N MD to Cape Cod. So LI into CT gets smoked but as the mid level low jumps, the heaviest precip is pulled east, limiting the dump-duration over central MA. Extreme eastern MA still gets smoked too. The NAM's QPF even shows this signature. Might even verify more pronounced (IF this evolution verifies)

ahh right...I see what you are getting at. At least there isn't a real killing dry slot like 12/26.

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100% agree. Maybe the rest of the 12z suite will snap everyone back into reality mode.

It'll be right once, but it's not surprising that the models that busted in overamplifying things from the get-go are on the wet side of guidance.

He's in Keene...most aren't. Why would someone like me or Bob or Scott or Will or most others not be happy with the NAM?

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accu weather only giving spfd area five inches...that is nothing more than pedestrian...

seems like a lot of talk about ri and east mass ct and long island..i am getting the sense that we are just gonna get a few or several inches here and watch everyone else get rocked..i do not know how much more of this i can take..

spfd is part of sne too!!!

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mid level low makes a larger jump from PA / N MD to Cape Cod. So LI into CT gets smoked but as the mid level low jumps, the heaviest precip is pulled east, limiting the dump-duration over central MA. Extreme eastern MA still gets smoked too. The NAM's QPF even shows this signature. Might even verify more pronounced (IF this evolution verifies)

What are you thinking for SW NH, NW MA. etc? General 4-8" with some lollipops?

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He's in Keene...most aren't. Why would someone like me or Bob or Scott or Will or most others not be happy with the NAM?

Who said you shouldn't be? It's a nice 6-12 for most everyone with the option of 8-16 when we figure out where the max will be.

I'm just pointing out the NAM is going to be too far NW I THINK. The track around the BM which is supported by the Euro and others sounds best to me and SE OF ACK. Again I may be wrong, but that's just my opinion based on everything that's gone on, verifications leading up, NAM trends itself etc.

If I had to put money on a model it'd be on the GFS, with some also on the Euro. That's all I'm saying. GFS biases not excluded with QPF etc, probably being a little SE.

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