avalanche on powderhouse

Location Name: 
Powderhouse
Region: 
Luther Pass Area (including Job and Freel)
Date and time of avalanche (best estimate if unknown): 
Tue, 01/10/2017 - 23:01
Location Map: 
United States
38° 47' 1.6404" N, 119° 58' 46.5888" W
US


Red Flags: 
Recent loading by new snow, wind, or rain

Observation made by: Public
Avalanche Observations
Avalanche Type: 
Dry
Slab
Slope: 
38degrees
Trigger type: 
Skier
Crown Height: 
1 ft
Aspect: 
North
Weak Layer: 
Storm Snow
Avalanche Width: 
200ft.
Terrain: 
Below Treeline
Elevation: 
9 100ft.
Bed Surface: 
Storm Snow
Avalanche Length: 
1 100ft.
More detailed information about the avalanche: 

On our second run at Powderhouse today we got a bit greedy. Our first run we stopped at 8,800' or so and noticed no instabilities. Additionally the slope angle maxed out at around 35 degrees. Our second run we followed the skin track a bit higher and decided to stop when we noticed the snow was a little more cohesive in spots. Our drop in was probably right in the sweet spot (38 degrees) and we knew a small pocket might release since most of the terrain is between 30 and 35 degrees below. On the first skier's third or so turn it broke behind him (me). The skier came to a stop and it then broke again about 15' in front of him. The main slide propagated to the right once about 50 yards at the the start and then another hundred yards to the right again about 300' below. Everything went all the way to about 200' above the flat shelf at the bottom. Near the bottom the slide buried what I consider to have been a very safe and conservative skin track. We did initiate a search starting about 2/3 of the way down with no pings other than a group we were trading laps with. Ours and theres were the only cars in the lot. I do have video skiing down the slide path afterward. I'll post it shortly.
The slide broke on a density change within the new storm snow well above the thicker crust from the recent rains. Strangely, the crown was a very consistent 1' everywhere we looked. The rain crust was typically about three feet+ deep.

Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Moderate
Precipitation: 
Snow
Air temperature trend: 
Warming
Wind Direction: 
Southwest
Accumulation rate: 
Greater than 1 in. per hour