Details

• Date: 2017/12/27

• Observer: Crested Butte Avalanche Center
• Organization: CBAC

Location

• BC Zone: Gunnison
• Area Description: Anthracites
• Route Description: North, Northeast, East

Weather

• Weather Description: Generally clear skies with few clouds about. Winds were light with no visible transport.

Snowpack

• Snowpack Description: After the past weeks snow, sheltered terrain around the Anthracites, have settled new snow depths of 22cm to 35cm. Recent snow was still Fist hardness but certainly has begun to settle and become a bit more cohesive. In areas that saw wind deposits were definitely slab like with 4finger hardness. Ski conditions were noticeably more supportive today. While skiing tree chute and sliver, cracks and collapsing were common. Even in well sheltered pitches. These instabilities were relegated to new/old interface, about 30cm down. We also experienced a large collapse at top of big chute. This collapse occurred below the most recent snow(this location has seen several loading events from wind prior to last weeks snow). The collapse propagated 100ish feet, basically the entire start zone of big chute. This collapse didn’t avalanche, but it did release a wind slab on furthest skiers left edge.

Snowpack Obsvervation Cracking: Shooting Collapsing: Rumbling

Avalanches

• Avalanche Description: Numerous slides- multiple releases at top of east bowl(photo), several small rollovers half way up skinner(photo), numerous at head of Playground Basin(photos), and one remote skier triggered in Big Chute(photo)

	Date	Location/Path	#	Elev	Asp	Type	Trig	SizeR	SizeD
	2017/12/25  †	Anthracites	3	<TL	NE	SS	N	R1	D1
Date: 2017/12/25 (Estimated) Observer: Crested Butte Avalanche Center Organization: CBAC Landmark: Anthracites Sliding Surface: I - New/Old Interface Weak Layer Grain Type: Faceted Crystals Comments: On skin track
	2017/12/25  †	Anthracites	3	<TL	E	SS	N	R1	D2
Date: 2017/12/25 (Estimated) Observer: Crested Butte Avalanche Center Organization: CBAC Area Description: Anthracites East Bowl Landmark: Anthracites Sliding Surface: O - Within Old Snow Weak Layer: Layer Weak Layer Grain Type: Faceted Crystals
	2017/12/27  †	Anthracites	8	TL	NE	SS	N	R1	D1.5
Date: 2017/12/27 (Estimated) Observer: Crested Butte Avalanche Center Organization: CBAC Area Description: Playground Landmark: Anthracites Sliding Surface: O - Within Old Snow Weak Layer: Layer Weak Layer Grain Type: Faceted Crystals
	2017/12/27  †	Anthracites	1	TL	N	SS	AS / r	R1	D1
Date: 2017/12/27 (Estimated) Observer: Crested Butte Avalanche Center Organization: CBAC Landmark: Anthracites Weak Layer: Layer Weak Layer Grain Type: Faceted Crystals

Media

Images