Avalanche

Snodgrass and pavent avalanche obs

Eric MurrowGunnison
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Observation photo 1

Quick report

Loose avalanches were easy to trigger on the north half of the compass.  Sunnier terrain features seemed stubborn to human triggers as the mature melt forms allow meltwater to drain efficiently.  Meltwater penetrated deep into the snowpack on northerly aspects below treeline, and Wet Slabs seemed like a possibility, although I didn't observe any natural activity.  I considered descending northerly terrain on Snodgrass, but the snowpack was far too wet to risk a surprise Wet Slab avalanche.

I triggered two loose avalanches on north and northeast aspects below treeline. One gouged into the snowpack (the slope is shallow from avalanche activity earlier this winter). A few new loose avalanches that ran today near and above treeline on northeast slopes.

Weather

Cloud Cover
clear
Snow Avail For Transport
none

Warm temperatures and occasionally gusty winds below treeline. Increasing clouds in the late afternoon.

Snowpack

I targeted northerly facing slopes up through 11,000 feet.  Loose avalanches were fairly easy to trigger here as meltwater hangs in the smaller-grained, winter-like snowpack.  I dug a profile near a location I dug a week ago (meltwater had not reached basal weak layers as of 4/5) and found that meltwater has reached basal weak layers at a depth of 180cm (6 feet, no previous avalanche activity).  Lots of water was hanging out in the upper snowpack, with water oozing into the rounding depth hoar below.  Ice columns were in the top few inches of depth hoar but did not reach the ground (see image).

Southerly-facing terrain below treeline lost support by noon, making it challenging to descend in the early afternoon (trapdoor).  

Avalanche

Size
D1
Type
WL
Count
4
Aspect
NE
Trigger
N
Elevation
11900 ft

This small, loose avalanche was not present when I skied through the area on 4/11 at 1pm.