Observation: USA Bowl

Observation Date
2/3/2019
Observer Name
E Walsh
Region
Salt Lake » Big Cottonwood Canyon » USA Bowl
Location Name or Route
USA Bowl
Red Flags
Red Flags
Wind Loading
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Increasing Danger
Problem #1 Comments
Strong S winds high on the ridge of the west coast of USA Bowl today between 11am and 3pm with intense blowing snow. Looked into West Monitor Sneak and observed potential wind slab formation on the steeper skier's left, but did not investigate. Significant wind scouring at high elevation and ridge of USA Bowl.
Comments
About 10" of new snow observed in the mid-elevations of the bowl in wind-protected terrain by 3pm. New snow sat upon a breakable melt-freeze crust at mid-elevations, but a thicker and more stout crust at upper elevations. The new snow seemed to bond well to the old snow interface, but hasty pits showed some weakness below the melt-freeze crust at mid-elevations. Damp, near surface facets observed just under the crust at mid-elevations could be the source of this instability. At higher elevations this weakness was not observed.
The new snow seemed to be primarily graupel and provided easy trail-breaking and good riding conditions at mid-elevations, making the melt-freeze crust a non-issue everywhere but near the ridge. No evidence of instability while descending the west coast of USA Bowl.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates