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Observation: Moab

Observation Date
12/18/2024
Observer Name
Maggie Nielsen & Blake Morris
Region
Moab
Location Name or Route
Pre Laurel Highway
Weather
Sky
Few
Wind Speed
Calm
Weather Comments
It was oddly warm up in the mountains today and felt a lot like the middle of March instead of December. The Kestrel read a temperature of 42F in the sun shortly after noon on our tour up and whether that was accurate or not, it certainly felt very warm for this time of year. So warm in fact, that Blake skinned in a T-shirt and the surface conditions began to soften by mid day on solar aspects. When we made it back to the Winter TH, the snow and ice that was packed on the ground of the parking lot was readily melting and forming puddles.
Snow Characteristics
Snow Surface Conditions
Powder
Wind Crust
Damp
Snow Characteristics Comments
The surface conditions were variable both in texture and spatial distribution. We observed surface hoar (~1cm) in open areas where the wind had not yet impacted and transported it. We observed sastrugi-strewn areas along with stiff, wind-loaded areas which had a strong propensity for cracking around my boards. We also noticed the surface conditions warming and softening in mid afternoon on solar aspects. Finally, we did manage to find a few sections of soft, powder with descent turns in the sheltered, shady areas. Under the snow surface, it was obvious that more cohesive snow was overlaying weak, uncohesive snow with a quick ski pole test and watching the dogs vacillate above and below the snow surface. We further observed this in a small pit we dug, highlighting basal facets in the bottom half of the shallow snowpack.
Red Flags
Red Flags
Rapid Warming
Poor Snowpack Structure
Red Flags Comments
It's clear we've got a poor snowpack structure with basal facets interfacing with more cohesive snow over top. In the few hours we were up in the mountains, it was incredibly surprising to see the temps warm enough to cause puddles to form at the TH and soften the snow surface above 10,000'. The need to skin in T-shirts in December feels like a red-flag in its own right.
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Same
Problem #1 Comments
Classic
Avalanche Problem #2
Problem
Wind Drifted Snow
Problem #2 Comments
It's apparent wind has been hard at work in the mountains lately. Wind-loaded areas appear to be sensitive right now.
Snow Profile
Aspect
Northeast
Elevation
10,200'
Slope Angle
45°
Comments
First day out since ACL surgery and it was nice to use the ol' leg again. Interested to see how things shape up in subsequent storms/months.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate