Avalanche: Millicent Back Bowl

Observer Name
Hardesty and Jones
Observation Date
Saturday, March 6, 2010
Avalanche Date
Saturday, March 6, 2010
Region
Salt Lake » Big Cottonwood Canyon » Twin Lakes area » Millicent Back Bowl
Location Name or Route
Elevation
9,700'
Aspect
North
Trigger
Skier
Trigger: additional info
Unintentionally Triggered
Avalanche Type
Soft Slab
Weak Layer
Density Change
Depth
8"
Width
200'
Vertical
300'
Comments

Punishing southeasterly winds led to extensive wind damage in the open exposed terrain in the upper Cottonwoods, particularly in the Wolverine/Alta/Brighton backcountry. Numerous naturals up to 12" this morning with at least 3 other shallowish (6-12") new wind slabs triggered by backcountry skiers. Many of these wind pockets were well off the upper ridgelines. Riding conditions excellent where sheltered........other terrain sun crusted, others was 60mph to a dead stop with the new stiff wind whales. See scalloping below.

Comments

This slide triggered above Twin Lakes Pass - toward the Patsy Marley side of the ridgeline. 40' wide, 6-15" deep. Leigh Jones examining the fx line. Northeast facing roughly 10,000'.

Comments

Well off the ridgelines a skier ahead of us remotely triggered this little wind pocket to skier's right. Not common for us to have strong southeasterly winds. Savvy folks look for unusual loading patterns, particularly off the ridgelines.

Comments

Another skier triggered wind slab not far from the Brighton/Millicent boundary. Skier made a few turns and saw the slope cracking around him - and was able to get off the slab and let it run. Looked 8-10" deep but perhaps 175' wide, running on a northwest facing slope at approx. 9700'. Cracking was everywhere. Partner got a large collapse on a wind pocket. Textbook.

Coordinates