With the season’s first “atmospheric river” expected this week, the Bay Area prepares to take a dip

Mercury News –

Last winter, it wasn’t until January that Northern California saw that first ribbon of wetness known as an “atmospheric river” roll in from Hawaii, hitting the region like some super-sized dunking booth.

This year, the river’s not waiting in the sidelines. On Wednesday, we’re expected to receive the season’s inaugural atmospheric river and it could leave as many as three inches of rain on the Bay Area.

A typical year in the Golden State would see from 5 to 15 of these meteorological masterpieces, which tend to produce our biggest storms and floods. So as that first plume of moisture winds its waterlogged way here, you might want to learn more about what’s coming our way.

Back in January, meteorologist Brian Mejia with the National Weather Service in Monterey gave us a crash course in a weather pattern most laymen had never heard of before.

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