Afternoon Video Update: NAO Blocking Signal Grows

 

Good afternoon! The well-advertised signal of high-latitude blocking developing in the 2nd half of November continues to grow. It all starts with an amplification and slowing down of a Pacific wave train, which helps to pump latent heat towards the Poles, further leading to ridging extending towards the Poles. Subsequently, this changes the background state of the Arctic to the point where North Atlantic blocking becomes more feasible, and thus the entire Arctic is able to see blocking. This has big implications as we head into late November and December. 

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