Looking at the image below notice how during July from 1967 to 2010 the North Pacific High was for decades roughly oval. Compare it to the shape yesterday as it was battered by unseasonal storms (the round isobar patterns between parts of the NPH). This is due in part the the atypical southerly storm track.
It is normal for the NPH to briefly change shape as systems cruise by the north. But this season is is hugely different and has spent times with part of it past northern Alaska.
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