Observation: Summit

Location: Tenderfoot

Route & General Observations

Storm day up the standard Tenderfoot up-track to a high point of 2600′. Looking at surface conditions and previous wide spread instabilities.

Red Flags
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Observer Comments

Increasing winds and precipitation.

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.

Mid 20s
S1-S2, increasing throughout the day
Light E to NE winds, increasing throughout the day
Overcast Sky

Snow surface

~ Road - 1150': Small surface crust over, loss of surface crust at 1150'. Got covered throughout the day.
~ 1300': 2" of soft new snow on top of two thin MF crusts with near surface facets in between the two MF crusts
~ 1500': Loss of upper MF crust, total of 8" of soft on top of a firm supportable crust
~ 2080': 5" soft new snow, lost of second supportable crust, about 12" soft total on top of a firmer density step.
~ 2600': In wind scoured areas, no new precip on top of a thin firm film. Smaller than 1cm crust.


We did various hand pits at different elevations, primarily soft unconsolidated snow and different density facets within the upper 25cm of the snowpack. No obvious hand shears.
Dug two pits one at 2200' and one in a scoured 2500' area above tree line. Within the pit we were able to identify multiple buried surface hoar layers, and large depth hoar on the ground. We got repeatable collapse on a BSH layer 45cm down, and collapse at the ground - but no propagation.

Tenderfoot Pit 1 - 2200' - NW Aspect - HS:135cm
Vday BSH down 25cm no resultds
5-8mm BSH layer with large chaining 1-2mm facets down 40cm
2-4mm BSH layer with .5mm facets down 45cm
6-8mm basal facets and depth hoar down 120cm to the ground
CT21 down 40cm
CT24 at the ground

Tenderfoot Pit 2 - 2600' - NW Aspect - HS:75cm
Thin film on surface above 20cm of wind packed precip particles on a MF crust with NSF above and below. 55cm of varying differences of facets to the ground.
Depth hoar and basal facets at the ground
CT11 down 20cm
CTN14 down 20cm

Photos & Video
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