Observation: Little Cottonwood Canyon

Observation Date
2/18/2016
Observer Name
Greg Gagne
Region
Salt Lake » Little Cottonwood Canyon
Location Name or Route
Upper LCC Perimeter
Weather
Sky
Obscured
Precipitation
Heavy Snowfall
Wind Direction
West
Wind Speed
Strong
Weather Comments
Period of heavy snowfall following frontal passage with sustained strong winds. Winds diminished noticeably by late in the afternoon.
Snow Characteristics
New Snow Depth
4"
New Snow Density
Medium
Snow Surface Conditions
Powder
Wind Crust
Snow Characteristics Comments

Hard to tell on snow totals with the strong winds.

Red Flags
Red Flags
Heavy Snowfall
Wind Loading
Comments

Toured in upper LCC, timing my tour for frontal passage. Pretty wild with very strong winds, intense pelting from graupel, and thundersnow! Following frontal passage as temps cooled snow became lighter density, but winds remained in the strong category from westerly directions. Strong winds such as this often drift on all aspects, and I was finding fresh drifts and cornices around the compass.

However, despite expecting conditions to become touchy with the period of winds and heavy snowfall, at most I could only find pockets of wind-loaded snow. Most of these were shallow (5-10 cms/2-4") although I also found some fresh drifts up to 45 cms (18"). But there were isolated pockets, and not widespread.

I left the canyon at about 4:30 pm, and things were much quieter with snowfall ending and winds diminishing.

Photos showing downed trees (there were several), as well as a very sensitive cornice on a north aspect that broke above my ski, and the clearing skies to the west by the late afternoon.

Video commentary showing likely avalanche problem for Friday.

Video
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate