Irwin Obs

CB Avalanche Center 2015-16 Observations

Location: Kebler Pass Area
Date of Observation: 01/02/2016
Name: Zach Guy
Subject: Irwin Obs
Aspect: South East, South
Elevation: 11,000-12,000 ft

Avalanches:
Weather: Scattered, thin clouds increased in coverage and thickness through the day. Calm winds. High of 34 at 10k
Snowpack: Widespread near surface faceting.
Checked out the bedsurface of a Christmas cycle avalanche on ESE aspect above treeline. Above the crusty bed surface, there was a foot of recent new snow faceting quickly. Advanced 1mm facets above the crust, widespread, F hard.
1 crown profile and one test profile on S aspects near treeline, showed 70 to 100 cm slab over crust/facet sandwiches. The facet/crust layers were more continuous and more reactive where trees had shaded the snowpack. See attached profiles and photos.

Crown Profile, S aspect near treeline

Crown Profile, S aspect near treeline

Test profile, S aspect NTL

Test profile, S aspect NTL

IMG_5447

Crust facet sandwich anyone? S aspect NTL, below 90 cm slab.

IMG_5446

Crown profile, S aspect NTL

Bed surface of Christmas cycle slide. ESE aspect ATL. Advanced facets forming above crusty bed surface.

Bed surface of Christmas cycle slide. ESE aspect ATL. Advanced facets forming above crusty bed surface.