Location: Kebler Pass Area
Date of Observation: 12/06/2018
Name:

Subject: Human Triggered Avalanche
Aspect: West
Elevation: 10,800

Avalanches:

Human Triggered Avalanche. 2 caught and carried, none buried.

Weather: Temps were in the mid 20’s, predominately OVC skies, at the time of the slide S-1 squalls where passing through, although about 20 min prior to activity there was a very brief, but noticeably warm break in the cloud cover. Creeper wind loading previous days with minimal new snow.
Snowpack: We had a skier triggered slide on 12/6 at 2:30 PM, west facing, ~11,000’, mid 30’s slope, Sunset Left/Outer Limits Interface. ASu-SS-R1-D2-O  125cm max crown height, ~25’ wide and ran ~200’ in a very narrow path thru a few woods at the start zone, max debris around 150cm.   One guide was caught, lost gear and has a minor back injury, but able to work. We are grateful.

Photos:

Location: Crested Butte Area
Date of Observation: 12/06/2018
Name: IG

Subject: Snodgrass obs
Aspect: East
Elevation: 10,000

Avalanches:

None observed

Weather: Snowing S1, little wind, warm temps approaching freezing. Began snowing a bit harder at 15:30
Snowpack: Traveling off the beaten path we observed widespread collapsing in large areas but observed no cracks. Weak structure near the ground with facets, over a crust on the ground. 4 finger above to fist near the top. HS 30-60 cms.

Photos:

Location: Brush Creek Area
Date of Observation: 12/03/2018
Name: Eric Murrow

Subject: West Brush Creek from Monday 12/3
Aspect: North East, East, South East
Elevation: 9,000′ – 11,000′

Avalanches:

Surprisingly only ID’d one slab through this terrain. Very small D1 tucked immediately below ridge top on NE aspect.

Weather: Cold day with mostly cloudy skies and light flurries. No accumulation. Winds were mellow at below treeline locations. Did not observer transport across higher terrain.
Snowpack: HS ranged from around 40 to 75 cm across terrain and variety of aspects. While walking through low angle meadows we were able to produce numerous collapses below Thanksgiving slab. A few of these collapses ran around 75′. The goal for this day was to identify if Persistent Slab structure existed in this shallower part of the forecast area. SE and S aspects below treeline were bare ground prior to Thanksgiving storm – structure consisted of 20cm 1F hard Thanksgiving slab on ground, 2 to 3cm melt/freeze crust capping Thanksgiving snow, top 25cm from the storm this past weekend. No real issues S and SE below treeline.
East and northeast were a different story. Much of this terrain showed thick melt/freeze crust at the ground from October snow, 15cm of 2-3mm facets from early November, 20-25cm 1F Thanksgiving slab, topped with 25cm low-density snow from last weekends storm. Structure out west Brush Creek on shady slopes mirrored areas in Kebler and Paradise Divide below treeline but snow totals were shallower and Thanksgiving slab is only 6″ – 10″ thick. The real concern in this area is collapsing below the Thanksgiving slab. The profile included below is for one such site. We were able to produce propagating results on NE @ 11,000′. Slabs are just thick enough and hard enough that avalanches are possible. We did not get up to the drifted near treeline terrain in this area, but looking through binoculars made leeward start zones look much deeper than below treeline.

Photos:

Location: Kebler Pass Area
Date of Observation: 12/05/2018
Name: Evan Ross

Subject: Fresh wind drifts at ridgeline
Aspect: East, South
Elevation: 9,500-11,500

Avalanches:
Weather: Overcast sky. Light to Moderate westerly winds drifting snow at ridgeline.
Snowpack: Traveled in this same area on 12/3. Measured HS at the same location as on 12/3. At 11,300ft, south aspect HS was 90cm. That was a 10cm drop since the last time I was there, but more snow has also fallen during that time so the drop would have been greater, compared to the unmeasured peak snowpack hight. Ski pen had decreased and the upper snowpack had gained strength in those couple days. On southerly facing slopes, our group of three observed no obvious signs to instability regarding a persistent slab issue. Put some hard ski cuts on a few southeast slopes as well, but otherwise chose to avoid skiing on those slopes.

At the near treeline elevation, near the ridge, there had been a good amount of wind-loading over the last few days. Pervasively northerly winds had loaded some good sized drifts over the top of the ridge, while today the westerly winds were cross loading the rips in the terrain. The drifts were thick to ski through, but didn’t budge under a few ski cuts. Still managed the terrain off the ridge with windslabs in mind.

On easterly facing slopes BTL, the obvious signs to instability had greatly decreased since 12/3. The PS structure was still there, but we were not getting the shooting cracks and booming collapses as often. Still chose to avoid slopes greater than about 32 degrees in this area.

Photos:

Fresh Drifts loading a south aspect at ridgeline. While todays winds were cross-loading snow across the ribs in the terrain. Plenty of fresh snow to move around.

Location: Kebler Pass Area
Date of Observation: 12/05/2018
Name: Tom Schaefer

Subject: owen pics
Aspect: East, South East
Elevation: 12,000

Avalanches: SS-N-R3-D2.5-O
Weather: OVC, MoD WSW winds
Snowpack: New snow loading

Avalanche from 12/5 in there AM on SE flank of Mt. Owen

Released 12/4 in the PM on South face-off Mt. Owen

Crown on SE shoulder of Mt. Owen

Photos:

Location: Crested Butte Area
Date of Observation: 12/05/2018
Name: ADB

Subject: Red Lady Glades (11:15-14:00).
Aspect: South East, South, South West
Elevation: BTL/NTL/ATL

Avalanches:

BTL/NTL/ATL-no avalanches on slopes skied which were mostly less than 30 degrees.
Unlike two weeks ago, no shooting cracks or whumping on skin track and off skin track at BTL. and NTL.
No shooting cracks or whumping on skin track at ATL.

Weather: obscured skies with variable winds with respect to elevation:

BTL: calm
NTL Light to moderate winds with some snow transport onto east slopes
ATL: Intermittent moderate winds with snow transport onto east slopes
Snowpack: BTL-unconsolidated snow up to 12 inches. Rocks are barely covered on some rocky sections. Skier with gear weighs 120lbs.
NTL-4 inch soft slabs forming with 0.5 inches of wind blown snow in skin track.
Hand tests revealed a melt freeze crust 8 inches deep on SE slope. No cracking or propogating cracks with hasty tests.
ATL-1-2 inch hard slabs and skin track is filled in.

Photos:

Location: Kebler Pass Area
Date of Observation: 12/05/2018
Name: Ian HAVLICK

Subject: Red Coon Glades
Aspect: South East, South
Elevation: 9,000-11,500

Avalanches:

Av: no avalanches observed.

Weather: Travelled to ~11,500ft. WX: Overcast whole day, surprisingly calm conditions BTL, temperatures mid 20s, Blustery ridgetop winds, did not see blowing snow on tour.
Snowpack: SPx: Several big collapses, a few shooting cracks extending down into basal facets (65cm), 4F midpack, 40cm thick. S aspect, NTL, open gladed. Boot pen did not penetrate ground. Snowpacks varies greatly with elevation.

Photos:

Location: Kebler Pass Area
Date of Observation: 12/05/2018
Name: Ben Ammon

Subject: Carbon Peak
Aspect: North, North East, North West
Elevation: BTL, NTL

Avalanches:

none observed

Weather: Broken or Overcast all day, winds L from NW, cold
Snowpack: Rumbling collapses BTL and NTL on NW, N, NE aspects in trees, small clearings, and meadows. Many large enough to knock snow off the trees. HS 100-150cm on NE aspects NTL,

Photos:

Location: Paradise Divide Area
Date of Observation: 12/04/2018
Name: Steve Banks

Subject: 12/4 Natural Avalanches
Aspect: East
Elevation: ATL/NTL

Avalanches:

Several recent natural avalanches were noticed on Whetstone Mountain (North Ridge of the M Face), Mt. Richmond (ran during the day 12/4), Purple Ridge, East ice of Mt. Owen (photo attached) and Mineral Point.

Weather: Sunny and cold with temperatures in the single digits. Winds were light at lower elevations but obvious flagging was noted off most peaks above 12,000′
Snowpack: On S-SW slopes below treeline the persistent slab structure was intermittent and seemingly unreactive. A crust above the Thanksgiving snow was found in some areas, but not all.

Photos:From Chris Miller