Avalanche: Turnagain

Location: Pete's South

Route & General Observations

APU Snow Science 1 field day to gather snow observations about the reactivity of the persistent weak layers as well as to collect snowpack depth measurements for Community Snow Observations/Division of Geological and Geophysical Surveys. Toured up to 2300′ on Pete’s South.

Avalanche Details
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Trigger NaturalRemote Trigger0
Avalanche Type Wet Loose SnowAspect South Southwest
Elevation 3200ftSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

Only one recent loose D1 avalanche observed initiated on ridgetop rocks along Pete's North ridgeline.

Red Flags
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Observer Comments

None observed.

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

Sunshine! Pleasant temperatures. Calm to light winds. No new precipitation.

Snow surface

Dust on crust to breakable crust to quite hard slippery surface at the elevations above 2000'.
Some sastrugi above 2200'.
Maybe some NSF or surface hoar growth in places.
Southerly slopes were warming up when we were heading down ~3pm.

Ski quality was not as poor as we were anticipating. Nice supportable turns were to be had above treeline. Travel through the alders and forest was not ideal.


We did not get the persistent weak layers to react on our locations. 8xCTN, 6xECTX. After standard test procedure, additional force made some tests pop at the layer of 1mm facets ~55cm from the surface. Propagation test result on this layer was PST 50/100cm End. PWL is there but it is seemingly sluggish to react.

We collected HS data throughout our travel, these data points are posted on Mountainhub. DGGS was flying a LIDAR for snowpack observations this week. Check out https://communitysnowobs.org/ to get involved with "ground truthing" the remote sensing data.

Photos & Video
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