Los Angeles Times

No one expected 31 atmospheric rivers storms to hit California. The mystery remains why?

LOS ANGELES — As winter approached, few anticipated what was about to hit California. Mired in a serious drought, the state was suddenly battered by an onslaught of 31 atmospheric river storms in a matter of months. While the number alone isn't exceptional, the location, intensity and duration of these storms had a transforming effect on California's climate. Record snowfall. Deadly flooding. ...
Giant snowbanks border a sidewalk on the Mammoth Lakes campus of Cerro Coso Community College on April 3.

LOS ANGELES — As winter approached, few anticipated what was about to hit California.

Mired in a serious drought, the state was suddenly battered by an onslaught of 31 atmospheric river storms in a matter of months. While the number alone isn't exceptional, the location, intensity and duration of these storms had a transforming effect on California's climate. Record snowfall. Deadly flooding. The end of many drought restrictions.

But one thing remains a mystery: Why did so many of these bands of water vapor, many back-to-back, slam into California?

While storm tracking has improved in recent years with data from better satellite images and , scientists have not been

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