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 cold Pacific storm system produced significant to heavy snow across portions of eastern Utah and western Colorado mostly within a 24-hour period from Saturday, January 20th to Sunday, January 21st. Snow began falling across northeast Utah Saturday morning, and generally spread south-southeast across the region during the day Saturday and into Sunday. Blowing snow was common in many areas. Snowfall persisted into Sunday night mainly over some northwest facing mountain slopes. Some lower elevation precipitation began as rain on Saturday, then changed over to snow behind the cold front.

Storm Total Snowfall (January 20 - 22, 2018)


Highway 40 on Rabbit Ears Pass (Photo: CDOT)	Highway 550 on Red Mountain Pass (Photo: CDOT)	Highway 50 on Monarch Pass (Photo: CDOT)

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Highway 145 near Telluride (Photo: CDOT)	Silverton, Colorado (Photo: CDOT)	Flaming Gorge, Utah (Photo: Flaming Gorge Resort)	Castle Valley, Utah (Photo: Perpetual-Motion.com)

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

January 20-21, 2018, Winter Weather Event