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Flaking Our Way Into MLK Weekend 1/17-1/18


Clinch Leatherwood

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Will is there any last second things that could make this more of an event toward bos, I mean anything!? To shift confluence north

 

There's not a whole lot...if we can somehow slow down the PV slowly moving ESE then we could bring it a tick NW. Or if the energy diving in from the plains is much sharper than guidance has, then it would try and phase with the southern stream...but its just not potent enough and the northern stream acts to suppress it.

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There's not a whole lot...if we can somehow slow down the PV slowly moving ESE then we could bring it a tick NW. Or if the energy diving in from the plains is much sharper than guidance has, then it would try and phase with the southern stream...but its just not potent enough and the northern stream acts to suppress it.

 

very helpful for a weenie to know what to pray for.  seems like a couple members of various ensembles that went "off the deep end" were probably doing the latter.  i remember the 12/29 event had energy diving in the plains much flatter than what played out 2 1/2 days later, but the guidance caught on within 1.5 days i believe (even thou) it still probably understimated that vort max about 24 hrs out (when i recall some Ohio valley obs of planes flying in greater instability than forecast was occuring that morning) i wonder if the SPV can slow down slightly AND if we can get the trough a bit sharper.  Obviously we'd need to see a trend tonite on the 0z euro and latest 12z tommorrow for this hail mary. But i'd settle for either one of those two above mentioned things occuring and giving us a 1-3 from NE mass SW to NYC

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well from M.A thread Ian was mentioning how the trend in this time frame is north, but that relates more to the DC crowd.  Lets see what the northern stream can do to help us.  slow down the SPV or amplify and phase. i don't think the second is happening, i think iwe can  bring confluence zone further north maybe we can get BVY-PVD into a .25 band but that's about it.

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well from M.A thread Ian was mentioning how the trend in this time frame is north, but that relates more to the DC crowd.  Lets see what the northern stream can do to help us.  slow down the SPV or amplify and phase. i don't think the second is happening, i think iwe can  bring confluence zone further north maybe we can get BVY-PVD into a .25 band but that's about it.

 

Subtract the NAM and what we had was models moving to consensus.    ARE animations working now, I'd like to post one that illustrates this point below.

 

So as Kev would say balls out:

 

I think at 0z we will find the Euro was going to be too flat on the east coast vs actual, the 18z NAM agreed with it almost perfectly.  The RAP and GFS are somewhat amplified. SPC analysis at 23z agrees pretty well with the RAP at that time.  Slightly more ridging over the SE I think is the case vs the Euro/NAM, slightly less than the GFS.

 

Upstream north of ND, and this is the area that the GFS dives into the southern Lakes...the water vapor/RAP support the GFS having very good positioning on that lead feature.   The Euro has bounced around a bit on this and is in concert with the 18z NAM in diving almost straight SSE an impulse tonight,  the NAM trajectory is the same but doesn't really even distinguish it from the overall flow on the 18z.   I think that's the key difference between the yea and nay camp.  The GFS comes in flatter on the LEAD impulse, making room for the 2nd one to dive straight down into the southern lakes later. SPC analysis, the RAP and water vapor imagery show a little impulse right on the ND border along with the more important tandem impulses coming down - ie, flatter.  The Euro idea of a single entity seems to be in error here, the 18z NAM idea also seems OTL.  The GFS positioning was not bad, however it does seem to have not really grasped the kicking s/w behind the lead north of MT right now.   I don't know what to make of it but pretty clearly to me anyway, the Euro and NAM leave something to be desired.   The second feature being stronger, well I'm not sure what that would do later, could be a bigger boot depending on the angle, we'll have to wait and see.  I'll admit it's a little muddy north of the Dakotas, there's 2-3 features embedded in the flow.  IMO, we'll see shortly but I feel much more confident the NAM at 18z was total BS based on this, and that the OP Euro wasn't amped enough.   The models have gotten a pretty good grip on the big upper low in the south, it's north of the Dakotas where most of the problem/differences are IMO.

 

It's been awhile, and I'm having to shuffle around on different platforms today.  Will look again at 0z, but I'm somewhat optimistic still.  To me the key will be a stronger system digging down, and I think that's possible based on the water vapor and RAP.

 

EDIT:  I'm having a tough editing day.  Bottom line no real glaring errors, it'll be key to see how the models handled the energy north of the Dakotas coming into MN.

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