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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 



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










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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




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. 





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