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Model Mezzanine - 3rd times a charm


Baroclinic Zone

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Tomorrow aside... we have three events of interest through D10

 

1 ) the obviously trended disappointment for winter enthusiast mid week ordeal, that appears destined more than ever to move on a trajectory west of the Apps...  This is unfortunately, higher in confidence with only one lingering aspect offering uncertainty being whatever really gets relayed off the Pacific over the denser sounding domain of land.  Pending anything needing drastic correction when that happens, the mid week is now inside D5 of some of the more dependable model types and is therefore high confidence. Nevertheless, some lingering cold llv thickness will need scouring out and precipitating out of that effort ... some light snow prior to unabated warm front approach flips to rain S to N.  We probably warm or quasi -warm sector with 50s type intermediary air.

 

One less than noticed aspect about all that is that the southern component of the trough amplitude is turning negative ...subtending SE from the quasi closed low moving up over the eastern GL.  That should impose quite a rip of instability as it cuts N along the MA/NE regions.  I would watch for some sort of ribbon echo rad sinuously wobbling it's way through a band of moderate to heavy rain, and it appears to have intense mechanical forcing .. that can bring interesting weather phenomenon of non-wintry variety.

 

2 ) there is a coherent signal in the operational guidance et al, that is also heavily supported by teleconnector correlations, for a dramatic height fall translation through the GL and NE regions roughly D6 through 8.  This event appears nearly equal in standard deviation as the last arctic event that affected regions more east ... centered in NE and the MA a couple weeks back, if perhaps being offset only a little by just beginning unavoidable seasonal recovery.   The NAO is newly negative in the derivatives of the GEFs, but that may also be tension from the huge negative anomaly passing through Ontario and NE pulling the numbers down...  Nevertheless, is an indication that the cold event must be present in the majority of the GEF members ...which it is...  And, there is some uncertainty whether this can be lead off by a deeply carving 500 mb S/W, enough to bring some snow.  

 

Whatever happens, that appears to herald a few days of negative departures...which might parlay into the # 3

 

3 ) Around D9/10, we see the intense SPV height core begin to shift and fill.  That lowers the gradient overall, and the geopotential contours become "saggy" .. yet still cool.  Then, we have a steady diet of Pac S/W cutting underneath that synopsis; to me the enters the possibility for some sort of phasing in a lower ambient velocity fluid medium.  

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West based neg nao on euro towards march

 

 

not really ... it's more incidental because there's a whopper negative anomaly in the lower/western Maritimes of the Canada...the circulation around which has a transient ridge; but the D. Straight/Greenland regions have only modest positive anomalies in said ridge.  it's not really a true -NAO. 

 

although ha - i feel pretty confident that at some point this miserable annoying spring a -NAO will come in just in time ruin a timely seasonal warm up while being squarely too late for snow... 

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A couple climate sights down near there such as Richmond and Wallops Island have had more snow than me this winter.  Some models are hinting at some wintry weather here at the start, but the typical areas of NE probably stand a slightly better chance of that,

Coastal NC will have more snow than I on the season per the GFS.

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Same with our cutter to Chicago this week. Showed up at 384

 

Yeah there was a signal for this one too. And not sure what Ginx was seeing but there was a run or two showing a Chicago cutter but they were all over the place, and the most consistent look was a Cape Cod hugger look. So maybe you should be excited now that the Goofus is showing a Mid Atlantic storm in the long range since everything and its mother has come west this year.

 

We are coming out of a period of mjo phases 6-7 into now phases 8-1. That's a reason in itself to think this upcoming two weeks won't work out exactly the same as the last two.

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