Observation: Powder Mountain Backcountry

Observation Date
2/12/2019
Observer Name
Gagne
Region
Ogden » Powder Mountain Backcountry
Location Name or Route
Powder Mountain Backcountry/Sharps Mountain
Weather
Sky
Broken
Wind Direction
Southwest
Wind Speed
Moderate
Weather Comments
Winds increased throughout the day from the S/SW and were getting down to 8400'
Snow Characteristics
Snow Surface Conditions
Dense Loose
Wind Crust
Snow Characteristics Comments
HS consistently 2 - 2.5 meters, with a few outliers closer to a meter.
Red Flags
Red Flags
Wind Loading
Red Flags Comments
Pockets of wind-drifted snow up to 45 cms (18").
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Increasing Danger
Problem #1 Comments
Winds were moving and drifting snow along ridges, cross-loading down off of ridgelines to 8400'. Most of the drifts were stubborn and unreactive, but a few propagated a short ways from my skis. Drifts were generally pockets and not widespread. Increasing danger as winds are forecasted to increase throughout the next 36 hours.
Avalanche Problem #2
Problem
Persistent Weak Layer
Trend
Same
Problem #2 Comments
The slide on Sharps Mountain on Friday Feb 8 intrigued us at the UAC (observation). This was on a northwest aspect at 8500'. I looked at similar aspects today, generally between 8500' and 9000' in Wolf Creek Canyon and overall found a very stable snowpack, with depths exceeding 2 meters. However, I did find one possible outlier with HS 135 cms where the bottom ~30-40 cms of the snowpack was weaker facets. Difficult to gauge how widespread this problem is, and if it's more of an issue as the range moves more towards Cache Valley.
Came away with the feeling the problem of PWL's is isolated and will be found on west/northwest aspects that have been wind-scoured to prevent a deeper snowpack from developing and allowing facets to develop.
Snow Profile
Aspect
West
Elevation
9,000'
Comments
Overall snowpack looks solid in areas where I traveled today in Powder Mountain backcountry, and towards Sharps Peak. Some faceting at the snow surface in wind-sheltered areas, but this will likely deteriorate with warming weather forecasted. Storm Thursday through the weekend likely confined to weaknesses within storm snow, or at the interface with the existing snow surface; not expecting deeper instabilities.
There is a fairly deep snowpack at lower elevations, with some possible weak snow on northerly/shady aspects, and heavy wet snow/rain on Thursday may cause low elevation concerns.
Thanks to Mike Jenkins of Powder Mountain and Aaron Barnett of Whisper Ridge for spending time with me today and showing me around their zones!
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate