Avalanche: Summit

Location: Manitoba

Route & General Observations

Manitoba – scenic route up to the top (3600′)

Avalanche Details
If this is an avalanche observation, click yes below and fill in the form as best as you can. If people were involved, please provide details.
Trigger NaturalRemote Trigger No
Avalanche Type Wet Loose SnowAspect South
Elevation 3600ftSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Run 1500ft  
Avalanche Details

Under partly cloudy skies in the morning, it started as a relatively quiet day for avalanches in our vicinity. Manitoba in particular was protected from the sun midday... until 2:30 PM. Observed 5 wet loose avalanches - D1.5 to 2.5 - in the 30 minutes that followed full sun on the steep southerly slope just north of Manitoba. Additionally, a D2 wet loose slide occurred on a SE aspect of Fresno during this time, running into and filling up a glide crack we had been watching all day. This Fresno slide produced some small crowns as well as it traveled down slope (see picture below). Other areas of the pass that had wet loose activity during the day prior also saw some new similar slides through mid-afternoon, but it appears that - through 4 PM - today's activity was less than yesterdays.

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)?No
Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.

HOT. 50s at the road, 40s up high. When the sun would hit it made us really sad.
Few clouds, but amazing cloud placement put us in the shade a slight majority of the day.
Above 2000', light north to east winds, gusting moderate. Occasional strong gust at the top.

Snow surface

Wet surface at all aspects and elevations. At the top - 3600' - even northerly aspects had a thin wet layer over several inches of moist snow. To 3000' on West to South aspects, water is seeping into the top 6" of the snowpack, and runnels seem to be forming.
At 2000', on a 25 degree SE aspect, boot penetration as of 3 Pm was knee deep, with the top 12" wet snow. At 1200' - near the Manitoba Hut - even the trail was close to isothermal, with thigh deep boot penetration.


See pit results/surface photos below!

Photos & Video
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