Powerful Pacific System Impacting the West; First Significant Snow for Portions of the East

Power Pacific system will continue to bring significant impacts for Pacific Northwest into northern California the remainder of the week. Dangerous coastal affects, heavy rain, flooding, strong winds, and higher elevation mountain snow continues. Meanwhile, a storm across the east is set to bring the first accumulating snow to many higher elevations of the Catskills into the central Appalachians. Read More >

Overview

A strong cold front moved across the Western Slope of Colorado on the evening of December 22, 2020. The cold front, combined with a tight pressure gradient, instability aloft, and favorable upper level dynamics, produced strong winds at the surface. This led to the development of a snow squall which progressed through the portions of central Colorado. The National Weather Service defines a snow squall as "an intense, but limited duration, period of moderate to heavy snowfall, accompanied by strong, gusty surface winds".

Winds gusted upwards of 50 mph over the course of the snow squall which developed west of Craig, Co. Over the next several hours the snow squall progressed to the east-southeast. Impacts occurred along Highway 40, Interstate 70 and Highway 50. Temperatures ahead of the squall were above freezing which allowed for rain initially in spots. Flash freeze conditions were documented as temperatures quickly dropped below freezing. The squall was particularly strong near Steamboat Springs were lightning and white-out conditions were reported. There were at least 10-20 wrecks and slide-offs up and down the I-70 corridor between Gypsum, Wolcott, and Vail Pass.

The webcam at Craig Airport captured the snow squall moving through, and numerous people witnessed this impressive but dangerous phenomenon as it progressed into the evening.

KGJX Radar Data Showing Snow Squall Moving Through on December 22, 2020


View of the Snow Squall Before it Moved Through Craig Airport	View of the Snow Squall as it Moved Through Craig Airport

Photos & Video

Photos & Video


Video 1: View of Snow Squall in Steamboat Springs (Credit: Samantha Tisdall)	Video 2: View of Snow Squall in Steamboat Springs (Credit: Mike Lane)

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Powerful Pacific System Impacting the West; First Significant Snow for Portions of the East

December 22, 2020 Snow Squall Event