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Avalanche: Turnagain

Location: middle stretch Lyon Creek

Date:
Observer:
Route & General Observations

Marker is best guess of turning around point, not avalanche site. Route was up Lyon Creek Valley from the Center Ridge trail- skiing flats not telemark. Nothing you don’t already know, but the key message is extremely variable surface and loading conditions– even very small windward/leeward terrain features (rolling hill kind of terrain) have significant variability in snowpack and surface. Multiple avalanches had occured (natural triggered) both sides of valley, relatively small– hadn’t run out all the way to the flats, which they often do. Cornices at every opportunity. Test areas (small steep banks climging out of creek bed) relatively stable.

Avalanche Details
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Trigger NaturalAvalanche Type Unknown
Aspect UnknownElevationunknown
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Rununknown
Avalanche Details

multiple slides both sides of Lyon Creek valley- section after leaving trail up center ridge, before the low spot/pass where you can easily climb back up to the ridgeline (north/east side of creek). Assume natural triggers. No clue on depth. Long narrow slides, but not as long/deep as I've seen them in this location in the past-- not close to reaching the flats. Pretty tame, given this terrain w/recent conditions. Storm loading release slides, not the sun-warmed spring release slides.

Red Flags
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Observer Comments

No. Temporarily stable.

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

blue sky. Wind from north, or maybe north east? Temperatures in high twenties to low 30s. Some melt/refreeze over 3 hours depending on sun aspect.

Snow surface

new snow plus settled powder plus wind crust plus barely settled drifts plus small areas of melt/freeze crust plus some surface hoar/sugar snow. Extremely variable with the least bit of terrain rise/fall/change of direction. Crust was good though.. no breakable crust.

Snowpack

informal: steep banks/low lying cornice approaches more stable than expected. Could side step out/ski off without collapsing them-- testing cornices/banks down on the flats/small hill terrain near the creek. Mostly loaded towards downstream.