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Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Overview

A weak surface Low tracking along the international border with an attendant warm front sparked off severe storms near the warm front and in the warm sector. The day started with a few severe storms, but 50 knot bulk shear, and MUCAPE near 1500 J/kg contributed to storms with supercellular characteristics in northwestern Minnesota in the afternoon and evening hours of June 12th.
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