Avalanche: Holiday Bowl 12/13/2009

Observer Name:

toby

Observation Date:

12/15/2009

Occurrence Date:

12/13/2009

Occurrence Time:

Unknown

Region:

Holiday Bowl
Blind Hollow
Logan River
Logan

Location

41° 52' 42.8592" N, 111° 39' 5.7852" W

Avalanche Characteristics

Elevation:

8800'

Aspect:

North

Northeast

East

Slope Angle:

Trigger:

Unknown

Avalanche Type:

Soft Slab

Weak Layer:

Facets

Depth (avg):

16"

Depth Range:

12" to

19"

Width:

250'

Vertical:

Unknown

Snow Profile

Snow Profile Comments:

Even 4 days after the natural avalanche, we still found full prop. in ECTs. Tests near the avalanche site showed propagating failures on faceted snow just under the very apparent 11-21-09 dust-layer.

General Comments

In the clearing weather, we could see this wide natural avalanche from late Sunday in Holiday Bowl, Upper Blind Hollow.

General Comments 2

We visited Holiday Bowl, several days after it'd naturally avalanched during the powerful storm on Sunday12-13-09.

We climbed up this smaller pocket just south of the larger slide in the main bowl. It probably released at the same time the as the larger slide as it is only separated by a narrow rib

Video 2:

General Comments 3

Here's a look at our results and our extended column test. The propagating failure occurred in very weak faceted snow just under the dusty layer.

Video 3:

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