The only meaningful troposphere-stratosphere coupling during the summer is QBO/tropics. Polar stratosphere is irrelevant as a pattern driver until the PV develops in the autumn.
The Euro run today was pretty decent. It's very, very wet for Sunday's front, then the ridge next week doesn't amplify into hellish proportions. Highs in the 70s and 80s, a nice seasonal break. Actual climo and what would have been considered an appropriate "answer" to this troughing sequence just a few decades ago. You can see at the end the first signs of retrogression too as the subtropical highs begin to shift over the Pacific, especially west of Hawaii.
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