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Observation: Moab

Observation Date
1/25/2021
Observer Name
T. Matthews
Region
Moab
Location Name or Route
Gold Basin
Weather
Sky
Broken
Wind Direction
South
Wind Speed
Calm
Weather Comments
Sky cover was in and out of BKN and SCT all morning. Calm winds with an occasional Light gust in terrain near treeline. Temps were in the mid to upper teens. Another beautiful day to talk a walk around in the mountains.
Snow Characteristics
Snow Surface Conditions
Powder
Snow Characteristics Comments
9" of new storm snow was recorded at the Gold Basin Study Plot. This combined with the 5 inches recorded from the Friday into Saturday morning storm has been a welcome and much needed refresh.
Red Flags
Red Flags
Recent Avalanches
Heavy Snowfall
Cracking
Collapsing
Poor Snowpack Structure
Red Flags Comments
The only big terrain I got a good look at today was into Exxons Folley. It naturally avalanched likely during the storm. See avalanche observations for more details. I suspect with better visibility and a vantage from higher terrain there will be other naturals reported. Recent heavy snowfall within the last 48 hours. Only 9" of new, low-density snow reported at Gold Basin, but likely more than 12" in higher terrain. The past two storms have created a F to 4F slab sitting on top of weak facets. The snow from the 2 most recent storms is producing shooting cracks and failing quite easy on the facets it fell on. Widespread shooting cracks within the new snow and more isolated collapsing. I did experience a large collapse with shooting cracks today on a SW aspect at 10,000'.
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Same
Problem #1 Comments
The problem that's wicked nasty and just won't quite. It's there, it's buried and soon there might be enough snow to start skiing lines and snowmobiling areas that have just been too thin all season. We've gotta check ourselves before we wreck ourselves. The snowpack structure is piss poor, it's shallow, and the bed surface of any large avalanche is probably going to be near the ground. Let's remember that 25% of avalanche fatalities occur due to trauma. The struggle is real in this mountain range we call the La Sals. There is a short supply of terrain that ever has enough snow on it that's <30 degrees in steepness. Pretty flat and heavily tree'd in the middle and steep ATL terrain that we'd all like to get radical on, but nows not the time. There is a reason that the big lines here don't usually get skied until the spring time. Bonus stuff to remember as well. It doesn't take that radical slope above treeline to kill us. The small steep ones can do that too. North facing Exxons Folley produced a large persistent slab avalanche sometime yesterday during the storm. 11,200 feet 500 feet wide ran 600' vertical looked to be 2.5-3' deep. SS-N-R3-D2-O.
P.S. I think this problem is creeping around the compass to westerly aspects.
Avalanche Problem #2
Problem
New Snow
Problem #2 Comments
The new storm snow was widespread reactive today, and it wasn't just the new from yesterday and last night, but Friday's storm too. Both storms combined forces and was failing on the surface snow it fell on. Widespread cracking and propagation was observed. Small slab failures within the storm snow on small test slopes were easiley producing avalanches. Small informal hand sheer test on north aspects were cracking and failing before I could isolate the back of the column. NE aspects allowed me to fully isolate, but failed with a slight pull on the back of the column as seen in the video. Trigger a storm slab and it's bound to step down into deeper buried snow and create a larger avalanche on the north half of the compass. Perhaps west aspects are coming into play as well.
Comments
Photo 1: Natural persistent slab avalanche in Exxons Folley. See avalanche observations for more details.
Photos 2 and 3: Highlighting instabilites within the last two storm cycles new snow.
Photo 4: Illustrating the depth of the two most recent storms combined at roughly 10,000'.
Video: Sensitivity of the new storm snow sitting on facets.
Video
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
Considerable
Coordinates