Sin Nombre

Location Name: 
Sin Nombre
Williams Lake Area
Date and time of observation: 
Mon, 12/09/2019 - 11:53
Location Map: 
United States
36° 32' 33.1224" N, 105° 26' 3.3756" W

Red Flags: 
Recent avalanche activity

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

Went for a walk back to Sin Nombre to see what the winds overnight had done to 6 - 8" that fell on Sunday.  As to be expected winds slabs had formed with stiff 4F to 1F wind board varying from 10 to 60 cm in spots.  We did not observe any shooting cracks in this wind slab today. Stability tests were indicating that the graupel that fell on Thursday has not healed.  We were getting Easy to moderate force failures on the graupel layer underneath the newly formed wind slab.  Better skiing and riding was found in wind sheltered areas near and below treeline.

We had reports of numerous explosive triggered avalanches in the wind slab with a couple stepping down into older faceted layers.

Photo 1: Snowpit above treeline on a N aspect with and ECTP 11 SP on the graupel layer (this slope had run during the 11/30 avalanche cycle and did not have depth hoar)

Photo 2: Graupel as the culprit for the clean shear on the Extended Column Test

Snowpack photos: 
Weather Observations
Blowing Snow: 
Cloud Cover: 
75% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
Less than 1 in. per hour
More detailed information about the weather: 

A mix of sun and clouds today.  Mostly clouds with the sun poking through at times.  Light flurries throughout the day with no accumulation.  Winds were light out the West with no new snow transport.