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Feb 15th-17th. Just believe it or leave it.


peteradiator

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Opining aside ... it really comes down to wave-space geometry, which in its self is a question of certain complexity because that can be shrunk or stretched based upon the wind velocities circuitous about the ridges and trough. 

 

Faster over all means longer wave lengths (usually...there are extreme scenarios where that's not the case); contrasting, when the gradients weaken as we head toward warm seasons, the wave-lengths shrink.  That's the basic gist.  

 

Here, that trough in the east ...it really has two distinct waves sort of vying for proxy inside the totality of the trough translation. You know ... not too dissimilar to the last series of events that brough the big bomb off the SE coast, and nudged it too far E to really more profoundly impact our area.  It's just that in the case with the last, the wave spacing was spread out over a somewhat larger area.. but the concept/interaction of streams is still the same; and really, it's been the tenor of the entire winter - waves inharmonious in their interactions (deconstructive). 

 

In any case, if you take the two in situ waves in that trough, and average their longitude, that's probably a good measure for where the actual long-wave trough axis is situation.  Using the last several runs of the GFS, that appears to be right around 80 W.  That's important because, the ridge in the west is situated near the longitude of Idaho while the trough in the east reaches it's greatest amplitude - therein begs the question for the astute synoptician:  'is that an acceptable, or correctable wave spacing'

 

The latter part of that question is definitely going be a complicated one because as said, ...the wind velocities everywhere are just screamin'.  Jesus.  It's a stretchy season.  Probably related to the multi-decadal signal for the north Pacific to be predominantly AA in phase, while a broiling warm ENSO bubbles away down south ... i.e., unusually high gradients in the means.  

 

So I don't know... could go either way.  The winds could be over-assessed all if the wave comes off the Pac somewhat less in strength ... it would feed back in a more west track ironically, because that ridge in the west a bit too far west for ideal theoretical wave spacing.  It's almost like because we have a lack of antecedent lower tropospheric blocking (as Will and Scott have hammered correctly all week) you want the wave wind velocities et al to be stronger, such that it stretches the flow more and parlays to a track more needle threading...  

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John, really interesting post....so this may be unusual in the sense that in order to get the low east, we may want to hope a STRONGER sw emerg onto the western shores, because the associated higher jet velocities would ultimately help shunt this east.

Awesome post....never would have thought of that.

 

The seasonal trend may work in our favor for once.

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