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Observation: Horse Creek

Observation Date
12/27/2023
Observer Name
Garcia, Ament, Hollis
Region
Moab » Horse Creek
Location Name or Route
Horse Creek
Weather
Sky
Clear
Wind Speed
Calm
Weather Comments
Calm all day in the drainage. PLP anemometer shows moderate ridgetop winds for most of the day. We did not observe any blowing and drifting snow. It seems the strong Northerly winds from 12/24-26 stripped the high peaks, and there isn't much snow left available for transport.
Snow Characteristics
Snow Surface Conditions
Powder
Dense Loose
Wind Crust
Snow Characteristics Comments
The 8" of snow that fell on 12/23 is not supportive and is already starting to turn to facets. While breaking trail, our skis would penetrate deep into the most recent layer of snow. We managed to make some turns on a grassy slope in pinto glades. We probed 45-50 cm of snow on this sunny SW facing slope, but most of the slope was very thin and looked more like the photo below
We thought we might me able to make some turns on the Northerly facing slopes in upper Horse Creek. We walked to the bottom of these slopes and they were showing too many rocks so we bailed on skiing. Unfortunately, it is still very thin cover out there.
Red Flags
Red Flags
Recent Avalanches
Poor Snowpack Structure
Red Flags Comments
We observed a small, natural avalanche caused by wind drifted snow on a NE aspect around 11,000 ft. The slide looked to be at least a couple days old. The existing snowpack is weak. High pressure, and cold clear nights are only causing the pack to get weaker.
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Decreasing Danger
Problem #1 Comments
We did not observe any blowing and drifting snow today. We did observe this small natural avalanche in the Horse Creek Chutes. The avalanche probably occurred on Sunday or Monday during the strong Northerly wind event. This avalanche looks to be quite shallow (maybe only a few inches deep). A slide like this might knock a skier off their feet, but is certainly not deep enough to bury a person. See the avalanche obs for more details. At this point, it seems unlikely for a skier to trigger an avalanche like this in wind-drifted snow. If triggered, these avalanches would be small and limited to isolated terrain in the upper elevations. This terrain is very hard to access right now with the thin cover.
Avalanche Problem #2
Problem
Persistent Weak Layer
Trend
Decreasing Danger
Problem #2 Comments
Today we broke trail in virgin snow for most of the day. We crossed a variety of aspects, and made it up to about 11,100 ft in Horse Creek. We did not experience any cracking or collapsing. We did not see any recent avalanches breaking into old snow. The 8" of snow that fell on Saturday (with 1" of water) is not behaving like a slab. It is not cohesive. This layer is already starting to break down and become faceted. We performed an extended column test and got ECTX. While the overall snow pack remains weak, we still do not have a true slab in place to cause avalanches. I have some concern for slopes near tree line and above that harbor a weak snow pack that have also been loaded up by the wind. On these slopes it is possible for the weight of a skier or rider to trigger an avalanche breaking deeper into old snow.
Snow Profile
Aspect
North
Elevation
10,800'
Slope Angle
28°
Comments
Digging in the snow today revealed a weak snow pack lacking much body to it. The most recent snow is already turning to facets and is not a cohesive slab. An extended column test resulted in an ECTX, no failure, no propagation. The snow pack remains unsupportive and boot pen is almost to the ground at 60cm. The facets at the ground were easily falling out of the pit wall today.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates