Relay Pk Avy weak layer reassessment.

Location Name: 
Relay Peak
Region: 
Mount Rose Area
Date and time of observation: 
Thu, 02/12/2015 - 11:00
Location Map: 
United States
39° 18' 53.28" N, 119° 56' 3.48" W
See map: Google Maps
US



Observation made by: Forecaster
Snowpit Observations
More detailed information about the snowpack: 

A second visit to reassess the weak layer associated with the snowmobile triggered avalanche on Feb 8 revealed no ongoing signs of instability (N aspect, 45 degree slope, 9,360' elevation). Rounding faceted crystals F+ hard (avalanche failure layer) under the base of a 1F hard storm slab remained in this area. ECTN results within the slab and ECTX result on the avalanche's failure layer. PST scored PST 75/100 end @ 74cm on rounding faceted layer (avalanche failure layer) at the base of the new snow slab. Tests performed digging a few feet up slope through the climber's left end of the crown line visible in the photo. Initial post for this avalanche which includes a crown profile is at: http://www.sierraavalanchecenter.org/mon-02092015-0900-avalanche-relay-peak.

Snowpack photos: 
Snowpit videos (tests, etc): 

20150212 Weak layer test on Feb 8 snowmobile triggered avalanche.

Weather Observations
Blowing Snow: 
No
Cloud Cover: 
25% of the sky covered by clouds
Air temperature: 
Above Freezing
Wind Speed: 
Calm
Air temperature trend: 
Warming
More detailed information about the weather: 

Thin high level cloud cover.