Observation: Iron Mountain

Observation Date
3/3/2022
Observer Name
Staples
Region
Uintas » Soapstone » Iron Mountain
Location Name or Route
Iron Mtn
Weather
Weather Comments
53 degrees F at the truck at Soapstone and 41 degrees at 9000 ft. Otherwise, clear, sunny, and very warm. Calm winds.
Snow Characteristics
Snow Surface Conditions
Damp
Snow Characteristics Comments
Damp surface snow in many places. Snow surface 30 degrees F and barely dry in the shade. Snow temps near the surface (distance from top down):
5 cm: 28 deg F
10 cm: 28 deg F
15 cm: 25 deg F
20 cm: 24 deg F
25 cm: 23 deg F
Red Flags
Red Flags
Poor Snowpack Structure
Red Flags Comments
Facets will be a problem this weekend
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Increasing Danger
Problem #1 Comments
PWL is there but not a problem in many places until more snow comes this weekend and next week.
Comments
Facets are staying dry, cold and weak on northerly facing slopes even at relatively low elevations like 8600'
Video
Did a PST (propagation saw test) which can show if a weak layer will propagate a crack by initiating the crack with a saw. It wants to fracture but can't because the slab of last week's new snow breaks first which arrests the fracture. There have been some slides in the Uintas like one Craig looked at where a little more snow and wind drifted snow created enough of a slab to help communicate that fracture.
Photo below shows how the slab fractured as I cut the weak layer underneath it.
Video
Today's Observed Danger Rating
Low
Tomorrows Estimated Danger Rating
Low
Coordinates