Skier Triggered Avalanche on Hourglass

Location Name: 
Hourglass Bowl
Mount Rose Area
Date and time of avalanche (best estimate if unknown): 
Thu, 11/16/2017 - 09:00
Location Map: 
United States
39° 19' 8.4324" N, 119° 55' 20.028" W

Red Flags: 
Recent avalanche activity
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain
Obvious avalanche path

Observation made by: Forecaster
Avalanche Observations
Avalanche Type: 
Trigger type: 
Crown Height: 
3 ft
Weak Layer: 
Old Snow
Avalanche Width: 
9 800ft.
Bed Surface: 
Old Snow
Avalanche Length: 
Number of people caught: 
Number of partial burials: 
More detailed information about the avalanche: 

*Small edits on Nov 21 after receiving first hand account from party involved. Number of people caught changed from 3 to 2, added the info of 2 partial burials, time of incident changed from 10:45 am to 9:00am.

Details about the party involved with this avalanche are limited at this point.  This avalanche occurred in the Hourglass Bowl on Tamarack peak.  It failed on a faceted layer near the ground within the old snow.  Rapid loading of heavy new snow was occurring when the avalanche happened.  Up to 3'+ of new snow was deposited in this area on top of a shallow snowpack that was 6-12'' deep on northerly aspects.   

Additional information from a Facebook post:

"I spoke with one of the party of 4 or 5 that were involved in the slide on my skin up. Three people ( I believe) were caught in it, two of which were slammed into trees/rocks but were ok. Another skier with a possible broken ankle. A couple lost skis as well."

Snowpit or crown profile photo or graph: 
Avalanche Photos: