Observation: Summit

Location: Manitoba Mtn

Route & General Observations

Standard uptrack from Manitoba Cabin to 2900ft on Manitoba Mtn.

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

Experienced Whumping above 2300 ft

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

Thin overcast, calm winds, Occasional flurries, 12degF,

Snow surface

26 cm new loose snow overlying 10 cm settled powder. Above 2900ft on SE ridge of Manitoba new snow draped over large wind ripples related to earlier wind event.


At 2600ft HS = 165 cm. Pit down to 120 cm. Top down 36 cm rimed new snow and settled powder, including 1 cm 1F wind crust? overlying 26 cm knife-hard wind crust. Below that rounds to 90 cm. Lower 30 cm rounding facets.
At 120 cm got ECTN24Q2 at base of rounding facet layer. Maybe be part of facet garden around alders in bottom of pit. Shovel shear gave STM@26cmQ3. Experienced whumping over large areas nearby. Probably due to new snow and dense underlying wind crust collapsing on rounding facet layer.

Photos & Video
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