Observation: Summit

Location: Manitoba Mtn

Route & General Observations

From Manitoba Cabin took standard uptrack via road and ski trail to approx. 2700ft on WSW aspect of Manitoba Mtn (pic).

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?No
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?Yes
Observer Comments

Saw no signs of recent avalanche activity. Did kick off some very localized shooting cracks, breaking at 5cm below snow surface under wind transported layer (pic).

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

This was day 3 of a run of cloudless bluebird skies with no wind. Temp at 1300 was -4C(25F). No new snow during this period (2/23-25) however indications of abundant wind transport and wind slab/sastrugi development related? to strong wind events of this past week.

Snow surface

From hut to 2275ft mostly loose snow with 1mm surface hoar and near surface facets. Boot penetration to 30 cm. Snow surface became wind rippled above that elevation which transitioned to wind slab and sastrugi above 2457ft (pic). wind slab/sastrugi seems to have formed due to recent strong northwest? winds (pic). Hand shears gave no results.


Quick pit at 2457ft, 60.68394, 149.43524. aspect 247deg. Incline 30deg. TS = 137cm. Top down: 137-128 = F 1mm surface hoar overlying near surface facets. 128-127 1F 1mm wind packed rounds. 127-108 = 4F 1mm facets. 108- 75 = 1F 0.5mm rounds. 75-27 = P 0.5mm rounds. 27mm-0 = 1F 2mm rounded basal facets. CTNx2.

Photos & Video
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