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February 2022 Obs/Disco


Torch Tiger
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1 minute ago, CoastalWx said:

Let’s get 2/2/15 type. 

Yeah the sleet tickles up to near MA border and then collapses back south with a bit of a secondary with another 6 hour burst. 
 

Man, almost everything went right during that 3 week stretch. Funny to say almost because we actually whiffed on a couple that just missed us east like 1/31/15…I think that one got downeast Maine hard. 

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6 minutes ago, ORH_wxman said:

Yeah the sleet tickles up to near MA border and then collapses back south with a bit of a secondary with another 6 hour burst. 
 

Man, almost everything went right during that 3 week stretch. Funny to say almost because we actually whiffed on a couple that just missed us east like 1/31/15…I think that one got downeast Maine hard. 

What changes would we need to see on the models to see a shift towards a Feb 2 2015 type solution rather than a boring ol 4-7 snow to mix to drizzle+dryslot SWFE? The OP runs don’t look great but it seems like the ensembles are more aggressive with the snow.

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The GFS isn't even suppressed as much as it's just south by virtue of stretching everything along the x-coordinate W-E  ... If the flow "geometry" is elongated, that pulls the latitude in both directions and ends up narrowing the system as well as taking it south of those guidance' that don't do that.

Not sure if that is right - frankly ... I don't think that it is. 

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39 minutes ago, MJO812 said:

This needs to shift south

Not sure it will, either.   It's presence in the guidance et al, actually predates the mode changes we've collectively noted of the  EPO and PNA.

Anything in the flow is then going to begin getting forced.  That leaves uncertainty as to how the ordeal at the end of the week will alter in time, both in structure and trajectory. 

Quick primer:

- The PNA rising from -.5 to +1 SD over the course of the next 9 or so days statistically correlates to eastern N/A events.

- The EPO falling negative over the same course ... statistically waits to impose a cooler look over eastern N/A.  The reason for that is because as heights rise over the NE Pac/Alaskan sector, there is/can be an immediate downstream height fall, situated at first over western Canada and into the Rockies.

If the EPO were not a part of week's total circulation morphology, it might be easier to visualize what comes of the end of the week... Something more straightforward Archembaultian sends a QPF bomb smearing along a more obvious conduit.   But the EPO happening in tandem, ..that changes the map a little.  We could send a cutter through DTX and not stress basic mass-field arguments.  Typical gestation of EPO, the flow then stretches some and the L/W bumps east, and then we're waiting on the next system at the end of the month.

The other aspect about this PNA is that it is biased W of typical lat/lon position.  That's actually been a leitmotif this season... with PNA ridging tending to askew climo.  That's causes spliting of the flow descending the Canadian Rockies for one, creating faux southern stream that then has to "rephase" over the Lakes and has been failing...  The blizzard ALmost pulled it off..but only partially...  Anyway, this PNA ridge is just far enough west, that adding the -EPO... that may want to tip the flow and correct that mess more W.  

I'm not sure... The flow is also still fast... The speed intrinsic to the flow is also a stress, too.  It's causing like double nested anomaly formats.  F weird year.  It's like Russian nesting dolls of anomalies.. .where every layer is anomalous relative to the layer containing.  

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Depends on what we mean by colder  -

the antecedence is essentially negligibly different.   The storm itself is modestly weaker, ..yet enough that it is punching less warm advection.  So there's a trade off there a bit in the form ptype regions being modestly S of previous fixes.   But the total storm manifold is actually closer to unchanged.

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