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Observations

Region: Turnagain
Location: Eddies
Observer:
Date:

Route & General Observations

Standard uptrack on Eddies to 2100′. We were looking at surface conditions prior to the next storm and digging to look for the Jan. 11 buried surface hoar and the NYE buried surface hoar.

Avalanche Details

Avalanche details

Trigger SkierAvalanche Type Hard SlabAspect West Northwest
Elevation 2100ftSlope Angle 38degCrown Depth3ft
Width 600ftLength 500ft  

Observer Comments

We (Party 1) were digging a pit in lower angle terrain near the looker's left flank of the avalanche. We did not see or hear it release. As we were finishing digging our pit two skiers (Party 2) came down to us and reported that they thought they might have triggered an avalanche. We popped out of the pit, looked south and saw debris. They also reported seeing two other skiers (Party 3) in the area. They were pretty sure they were not in the path of the avalanche but couldn't confirm their whereabouts. They skinned back up to see if they could locate them and we went towards the debris pile. We both went to search with our beacons. One stayed in a safe spot and the other went out onto the debris to check for a signal. While out on the debris, contact was made with Party 3 and we confirmed they were ok. They skied down to us and reported that one of them had ski cut across lower angle terrain and saw cracking and the avalanche release down the ridge. The avalanche propagated around three separate terrain features on the ridge and connected. From the road it looked like three separate avalanches. It ran approximately 600ft along the ridge and 200-500 ft down the slope. Blocks of debris were 4' high. The debris was approximately 3-6' deep. The avalanche was definitely large enough to bury, injure or kill a person.

Red Flags

Obvious signs of instability

Recent Avalanches?YesCollapsing (Whumphing)?NoCracking (Shooting cracks)?Yes

Observer Comments

Avalanche and shooting cracks observed

Weather

Weather

Overcast to obscured
light rain to 1600' around 3:30 pm
Temperatures in the 30Fs
Winds were light and easterly

Snow Characteristics

Snow surface

Melt-freeze Crust to 1700'
Moist, soft settled snow to 1950'
1950'-2100' stiff wind affected snow.

Snowpack

See snow pit photo. Pit @ 1900' dug just north of the avalanche that was triggered. Both the Jan 11th and the NYE buried surface hoar layers were found in the pit. Both layers were reactive in CT tests but no propagation in the ECT.
We did not get to do a crown profile due to the time of day and we were a bit spooked by the cracking in the bed surface combined with hang fire. We believe the avalanche ran on the Jan 11th buried surface hoar/nsf/melt-freeze crust combo that was observed prior to the storm. It may have also run just below this crust on facets.
The avalanche was triggered from a thin spot in the snow pack. You can see exposed melt-freeze crust over grass and rock nearby.

Photos & Video

Video

Photos



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