Details

• Date: 2017/01/31

• Observer: Devin Pool
• Organization: Public

Location

• BC Zone: Aspen
• Area Description: Maroon Bowl, Near Treeline, N Aspect.

Weather

• Weather Description: High Wind, Sun, W, 11,000

Snowpack

• Snowpack Description: Windslab over depthhoar

Avalanches

• Avalanche Description: Snowboarder triggered on ski cut over convexity

	Date	Location/Path	#	Elev	Asp	Type	Trig	SizeR	SizeD
	2017/01/31  †	Maroon Creek	1	<TL	N	SS	AR / c	R2	D2
Date: 2017/01/31 (Estimated) Observer: Devin Pool Organization: Public Area Description: North-facing side of Maroon Bowl, Dark Hollow area Landmark: Maroon Creek Maximum Slope Angle: 44 ° Elevation: 10400 ft Sliding Surface: O - Within Old Snow Weak Layer: Layer Weak Layer Grain Type: Surface Hoar Average Crown: 18 in Average Width: 250 ft Maximum Width: 300 ft Maximum Vertical: 400 ft Comments: Snowboarder and 2 others stopped above convexity and decided to traverse right to safer, low-angle terrain. Snowboarder (goofy-foot stance) did slope cut to right and saw cracks and slide propagating. Not caught or carried. Rider reported slide broke on surface hoar about 18" below surface. May have pulled out second slide on rider's left flank, or continued propagating well below crown.

Media

Images

Figure 1: Snowboarder triggered Persistent Slab avalanche while performing slope cut on convexity. N aspect.

Figure 2: Looking up at the crown of a slide triggered by a snowboarder while performing a slope cut to avoid a convexity. The slide broke about 18" deep, 100 yards long, and ran 400 vertical feet to the lower right corner of the image. Maroon Bowl, 1-31-17.