Avalanche: Summit

Location: Manitoba

Route & General Observations

Manitoba trail to “mini” Manitoba at 2100′

Avalanche Details
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Trigger UnknownRemote Trigger Unknown
Avalanche Type UnknownAspect Unknown
ElevationunknownSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?Yes
Observer Comments

Impressively wide runout on Moose Mountain, which also had a wide propagating crown along a NW loaded ridgeline. Recent slab on Butch NW aspect and across the road on a N aspect of Colorado at treeline, all pictured below, and a small slab on a NW aspect of Roaring Ridge, not pictured.

Corniced small features at treeline would break 5-10' in front of ski tips, with blocks up to 1' deep. Recently deposited wind slabs around 2000' were up to 18" thick, but other than corniced features they would not crack or collapse under skier weight.

Visibility was in and out, and there were likely slides elsewhere that we could not observe.

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

38f at the parking lot and near freezing at 2100'
Overcast or obscured skies with occasional very light snow
WINDY. Light N to NE winds at the road and in the trees, shifting to East winds - moderate gusting strong - above 2000'. These gusts would produce light to moderate snow transport.

Snow surface

At the road, 30cm of new dense moist snow capped with 1cm of wet snow. By 2100', this increased to 50cm of new fairly dense snow, with the top 15cm moist. Ski penetration of 6-8" below 1500', increasing to 10-12" above 1500' to 2100'.


See below for a pit dug on a west aspect, in a large opening in the trees. This location was chosen as it was fairly protected from winds and likely representative of the area in terms of total and new snow depth, and as a west aspect any buried surface hoar would have received less sun prior to being covered. We found one layer of prominent buried surface hoar 75cm from the surface, which only failed under hard pressure in a compression tests, and no result in the ECT.

Photos & Video
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