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Met Winter 20-21: Pattern Drivers & Evolution


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While there's reasonable agreement on a -AO and -NAO persisting into early January, there is some uncertainty WRT whether or not the Pacific side offers any help or not. The EPS develops a +EPO into e

I'm starting to get a little more excited for early-mid December. It looks like the Pacific jet will retract significantly, which is the real reason for the retrograding Alaskan LP. Upper level diverg

I think that we are going to see a pretty impeccable 500mb pattern after January 10th.    The -NAO originally forced by wave breaking (which is occurring in the very near future) will become

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As the trough pulls off the WC, the Atlantic trough backs in 

 

1611662400-GpXYybBy5WA.png
 

Not sure how stormy it is yet- but there is W/E trough. But it`s def cold 

 

 

1611662400-wAxOnvnE1PI.png

 

522

 

 

1611662400-EgdXeq8BoNw.png

 

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12 minutes ago, brooklynwx99 said:

not perfect, but this type of pattern is historically conducive for major snowfall

 

two large troughs over the NE and Europe, ridging in NAO and EPO domains, and a trough off the WC

 

as depicted, this screams redevelopment with very cold air in place

 

9A8046E0-68F4-4A50-A3FF-38D47BE1E751.gif

 

I like how the POS gets squeezed back over the AO domain, your mean air flow comes out of Siberia and now you`re connecting the trough to the one E of Hawaii here. 

I would like that to dive off more, so I get a transient PNA spike.

The teleconnection pressure differences don`t see that yet. 

 

But that`s a beautiful connection into Europe and should slow some stuff down. 

 

 

1611662400-TIo4okJYto0.png

 

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