Funnel Slide

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 01/24/2017
Name: CB Patroller
Subject: Funnel Slide
Aspect: West, North West
Elevation: 11,300

Avalanches: SS-AB-R3-D2.5-I, Ran 800′ vertical feet
Weather: Clear, Calm, 20F
Snowpack: 12-36″ New wind loaded snow over Jan. 19 surface hoar

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AIARE 2 Avy Course

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 01/26/2017
Name: Geoff Unger and Anne St Clair
Subject: AIARE 2 Avy Course
Aspect: North East, East, South
Elevation: 9,250’ to 10,200′

Avalanches: We did perform a number of informal tests on unsupported slopes and very steep short pitches on E and NE aspects near and above the Gothic road. Some of these showed evidence of past avalanching and had been refreshed with the old crowns almost buried. There was movement underneath the skis, but slabs did not propagate beyond ski tips and tails, but did fail down ~35 on the 1/19 SH Layer.
Weather: Scattered clouds and light winds. Stayed cold all day
Snowpack: We toured up to the meadow beneath the Rental Shop glades and dug on a NE aspect at 10,200 feet. CTM SC results were observed on a mid storm layer 28cm down CTH RP results were observed down 42cm on the 1/19 buried SH Layer. ECTN on the mid storm layer and no cracking down on the buried SH. PST 100/100 down 38 Buried SH layer was not easily observable to the eye where we dug our long column tests. Given sudden results our avoidance of steeper terrain from our trip plan and the bulletin was confirmed.

Star pass conditions

CB Avalanche Center2016-17 Observations

Location: Brush Creek Area
Date of Observation: 01/24/2017
Name: John lewis
Subject: Star pass conditions
Aspect: North, North East, East, South East, South, South West, West, North West
Elevation: 11000 and above

Avalanches: Fresh wind slab avalanches could be scene on star and pearl pass. Star men’s avalanche looked to be D2R3. Multiple point release avalanches started to naturally occur through out the day in and around the whole bowl.
Weather: 24 inches fresh snow at friends hut
Snowpack: A wind slab covered all aspects of the slopes around pearl pass and around friends hut, even the flat ground right outside friends hut. 24 inches of fresh snow fell at friends hut and high winds continued through the night. The fresh snow started to set up to a storm slab almost immediately. The wind slab was failing on slopes 35 degrees and great on most aspect.

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Explosive triggered avalanche at Irwin

CB Avalanche Center2016-17 Observations

Location: Kebler Pass Area
Date of Observation: 01/26/2017
Name: Irwin Guides
Subject: Explosive triggered avalanche at Irwin
Aspect: South
Elevation: NTL

Avalanches: Snow Safety team had one result. SS-AE-R1-D1.5-O Sunny shoulder left. Failed 45cm down on 1.5mm facets above a MFcr. I believe this is the 1/23 interface. We’ve gotten 112″ since the 1/19th and 31″ since 1/23.
Weather: Cold!
Snowpack: H2D 4″ .25SWE.

Low hazard south of forecast area

CB Avalanche Center2016-17 Observations

Location: Taylor Canyon
Date of Observation: 01/26/2017
Name: Zach Guy
Subject: Low hazard south of forecast area
Aspect: North, North East, East, South East, South
Elevation: Below treeline

Avalanches:
Weather:
Snowpack: Traveled near and around Taylor Canyon. HS ~100 cm. Only 6″ or less over the 1/19 interface (crust or NSF, no SH observed), and the upper snowpack is now entirely faceted and weak, with thin faceted crusts on sunnier aspects. Snowpack is quickly faceting throughout. I saw no avalanche concerns other than shallow facet sluffing, and we traveled on numerous steep slopes.

Deceptive, touchy, and unusual surface hoar problems

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 01/26/2017
Name: Zach Guy
Subject: Deceptive, touchy, and unusual surface hoar problems
Aspect: North East, East, South East
Elevation: 9,000-10,300 ft

Avalanches: See video. Skier triggered 7 soft slab avalanches 15-20″ deep on the 1/19 surface hoar layer, D1 to D2, depending on terrain size, on E and NE aspects below treeline. One was remote triggered, several were in surprisingly dense aspen trees, several broke onto slope angles as low as 31 and 32 degrees. One broke higher above me than expected and knocked me off my feet. Every slope steep enough to slide went except for slopes that had already naturally avalanched. Also observed a fresh animal triggered and sympathetic slide on a SW aspect below treeline.
Weather: Broken to scattered skies. Minimal precip. Calm winds. Cold temps
Snowpack: The usual bag of tricks aren’t working. No collapsing or cracking observed on low angle terrain, stability tests weren’t concerning, yet every slope we touched steeper than 33 degrees avalanched on surface hoar about 15-20″ deep. Test results were:
SE aspect, 10200 ft in sparse aspens. No surface hoar observed, ECTN H, BRK 30cm deep on small, rounding facets.
NE aspect, 10100 ft in a windsheltered opening. 1mm SH 33 cm deep. ECTN M, PC/BRK on the surface hoar.
In the past 3 days, I have yet to find propagating results in an ECT but getting consistent avalanches on the surface hoar layer. The ECT appears to be unreliable for our current conditions, or else spatial variability is very pronounced.

D1 animal triggered and sympathetic slide. SW aspect BTL, new in past 24 hours. Tracks in and tracks out…all good.

Natural that ran during the storm in relatively thick aspens.

Skier triggered slide in relatively thick aspens

Crowns were all 15-20″ thick, on the 1/19 SH.

Remotely triggered slide from 20 feet away.

Skier triggered from edge of path, propagated back to 32 degree slope.

Skier triggered, pulled out to 31 degree ridge.

Skier triggered slab on Emmons

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 01/26/2017
Name: John Eliot Hedges
Subject:
Aspect: North
Elevation: 10,000 ft

Avalanches: 18″-20″ persistent slab @ 30-35 degrees, skier triggered – 35 yard crown, debris built to a quick stop around 60 yards below trigger point. Obvious signs of other stress throughout these trees. Advise caution! No damage/injury
Weather:
Snowpack:

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Natural slide in Coon Basin

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 01/26/2017
Name: Jafar Tabaian
Subject: Natural slide in Coon Basin
Aspect: South East
Elevation:

Avalanches:
Weather:
Snowpack:

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Column Test for Fun

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 01/26/2017
Name:
Subject: Column Test for Fun
Aspect: South West
Elevation: 9012

Avalanches: Gullies on the NE aspect of the ravine had slid.
Weather: Calm, No Snow,
Snowpack: Did a quick column test and got SP on SS at 40 cm.

Snowmobile slide above Kebler Road

CB Avalanche Center2016-17 Observations

Location: Kebler Pass Area
Date of Observation: 01/25/2017
Name: Irwin Guides
Subject: Snowmobile slide above Kebler Road
Aspect:
Elevation:

Avalanches: Snowmobile triggered slide off Kebler by gravel pit
Weather: COLD (below 0 at 12,000′ all day), overcast skies, Mod SW winds w/ Strong gusts, periods of s-1 with 2″ new at study plot
Snowpack: Lots of collapsing, no movement of snowpack in Irwin Terrain.

Photo courtesy Kyle Waller