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Ending out December with a Potential Pattern Change


CoastalWx

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So 12/29, which should make it our last shot at salvaging December.....nothing before then, so....

Depending on the timing of shortwaves, we could get one last shot on 12/31 for the year 2014. That one has looked the best to me for snow since a few days ago...but the timing is uncertain...it could be more a 1/1 system too. At times, it has been 12/30 too.

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Well the pattern overall is serviceable for SNE. It may actually be a good thing that the NAO is showing signs of last winter. Massively +, but in a position to help try and keep it cold. We are certainly playing with fire, but given what we have to work with...it could be a hell of a lot worse. 

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Well the pattern overall is serviceable for SNE. It may actually be a good thing that the NAO is showing signs of last winter. Massively +, but in a position to help try and keep it cold. We are certainly playing with fire, but given what we have to work with...it could be a hell of a lot worse. 

We may be paralleling 2005 in the sense that the NAO begins to cooperate at the half way mark, not that I'm going to see 107.5" of snow. :lol: If you recall, the Jan blizzard-archimbault event was a manifestation of the modality responsible for that shift in the base state of the NAO. 

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It is really a La Niña pattern over North America. Probably why we can get away with a +NAO as it appears on guidance. Usually Canada is warmer in El Niño so a +NAO kills us. But we'll see how long this La Niña regime lasts. I definitely still expect a transition to more typical El Niño with less gradient and more split flow as we go deeper into the winter. When that happens, we are going to need the -NAO to appear.

Anyway, for more short term in the next week or two, we should have a few chances. But we'll be rolling the dice with the shortwave nuances with fast flow and no downstream blocking. But given there should be pretty good cold around, there's a good chance of cashing in on one of these chances.

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We may be paralleling 2005 in the sense that the NAO begins to cooperate at the half way mark, not that I'm going to see 107.5" of snow. :lol: If you recall, the Jan blizzard-archimbault event was a manifestation of the modality responsible for that shift in the base state of the NAO. 

 

My only concern is that I keep seeing these punches to the strat vortex, but the fooking thing is like Gumby. It bends, breaks, but then regains composure. Just has that feel of not getting a SSW event, but those events usually come on quick, so it would be dumb of me to say that. However, it's very tenacious, so I have some reserves.

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I forgot: are SSWs the overrunning type events? 

Also, forget about the massive storms most of us want; what are the realistic chances of relatively frequent light frozen events in the pattern change that is upon us. They count for something and certainly make for a better winter ambiance than frozen and green/brown.

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I forgot: are SSWs the overrunning type events? 

Also, forget about the massive storms most of us want; what are the realistic chances of relatively frequent light frozen events in the pattern change that is upon us. They count for something and certainly make for a better winter ambiance than frozen and green/brown.

Sudden Stratospheric Warming. 

 

You are thinking of Southwest Flow Event

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I forgot: are SSWs the overrunning type events? 

Also, forget about the massive storms most of us want; what are the realistic chances of relatively frequent light frozen events in the pattern change that is upon us. They count for something and certainly make for a better winter ambiance than frozen and green/brown.

 

No...lol. That term you refer to is a SWFE (SouthWest Flow Event) That's when the 850-500 flow is out of the SW and you get those overrunning events of snow and/or mixed precip. 

 

SSW means Sudden Stratospheric Warming. 

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Jeez I thought the 29 was at risk of going west..lol. That changed. Although I would rather some winter temps if it were to be suppressed. With the low track being dependent on what happens a few days prior, I wouldn't really write anything off.

 

The EPS members are all over the place on that thing. 

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