For the nerds, record high 500 mb heights for the month of May for nearly all of central and western Canada. Heights in this region were up to 3.5 standard deviations above normal for the month. No wonder this area went up in flames during May.? pic.twitter.com/XHsL8Hfaqg
Late May and early June have been charactered by (mostly) below average temperatures across California, with a notable lack of exceptional heatwaves across most of the Southwest during the same period. This is largely a continuation of a months-long pattern of unusually cool conditions in CA and along the U.S. West coast. Notably, however, this relative regionalized coolness has been in great contrast to conditions…nearly everywhere else on Earth during the same period, which have featured widespread anomal
Recently, this overall California coolness contrasted with exceptional heat elsewhere has been part of a coherent and persistent hemispheric-scale pattern, characterized by strong blocking ridges in the sub-Arctic and persistent low pressure anomalies in portions of the subtropics (including over the Pacific to the southwest of CA). This has also been associated with an enhanced subtropical jet stream in some places. Why is this pattern occurring, and why has it been so persistent? There’s always a certain
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