Avalanche

Boulder Ck

Ethan DavisGalena Summit & Eastern Mtns
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Observation photo 1Observation photo 2Observation photo 3

Quick report

We observed unreactive wind features in some middle elevation terrain. Crusts in the upper snowpack did not produce unstable snowpack test scores. Weak snow at the ground (~4' deep) appeared to be healing and unlikely to trigger where the snowpack is uniformly thick. 

I heard one small wet loose near Crown Point.

Weather

Air Temp
near 40 F
Cloud Cover
clear
Wind Loading
previous
Recent Snowfall
0
Snow Avail For Transport
small smounts

Clear and mostly calm. Inverted temperatures never seemed to mix out. It was much cooler at low elevations all day.

Snowpack

Below 8,000': Snow surfaces were an unconsolidated mix of facets and surface hoar atop the stout 12/24 crust. This would be alarmingly weak if loaded as is. Despite a warm day, this setup looked much the same as we exited. 

Above 8,000': We found unreactive wind features and a thickening slab. We targeted a location where the two prominent upper pack crusts were thin (WSW @ 8,500'). The uppermost was associated with very small facets and produced rough shears in small column tests but did not propagate. The lower crust was well bonded.

We also targeted a location where basal facets existed (WNW @ 9,100'). Here we found the basal facets to be moist and rounding. Human triggering in areas with a uniformly thick slab like this one (125 cm thick, P at the base) is unlikely. 

Avalanche

Size
D2
Count
8
Aspect
E
Trigger
N
Elevation
9500 ft

Some small wet loose around Boulder Pk from today and yesterday, but primarily roller balls. Large reported slides are from the Christmas holiday storm.