Avalanche: Porter Fork 3/4/2011

Observer Name:

Nelson

Observation Date:

03/04/2011

Occurrence Date:

03/04/2011

Occurrence Time:

Overnight

Region:

Porter Fork
Mill Creek Canyon
Salt Lake

Location Name:

Porter Fork

Location

40° 39' 35.7696" N, 111° 42' 51.192" W

Avalanche Characteristics

Elevation:

9500'

and below

Aspect:

North

Slope Angle:

Trigger:

Unknown

Avalanche Type:

Cornice Fall

Weak Layer:

New Snow

Depth (avg):

unknown

Width:

150'

Vertical:

500'

General Comments

Since Monday, 2/28/11, there have been 2 major cornice falls on the ridge west ot Raymond between points 9661 and 9776. Monday night's fall was natural, about refrigerator size and ran 300 to 400 ft. entraining quite a bit of surface snow. Last nights fall, also apparently natural was SUV size, again entraining a lot of snow and taking out two fair sized trees (8-12" trunk diameter). This one ran about 500 ft. This cornice was an old, hard cornice and ended up quite a bit down the slope. There were no tracks on the ridge so I am quite sure the cornices fell of their own weight.

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