The Ridiculously Resilient Ridge was a high pressure ridge that formed over the west coast of North America and blocked winter storms from reaching California in 2013, 2014 and 2015.

Last week, scientists at the National Center for Atmospheric Research published two papers attributing the Ridiculously Resilient Ridge and this year’s record precipitation to the same phenomenon: a wave pattern that emerges in the upper atmosphere and circles the globe.

Read the National Center for Atmospheric Research press release

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