Snowpit and snow observation from Horse Creek drainage

SNOWPACK OBSERVATION
Submission Info
Saturday, December 16, 2017 - 8:45am
Red Flags: 
Whumphing noises, shooting cracks, or collapsing
38° 5' 59.7768" N, 119° 22' 38.3772" W
Snowpit Observations
More detailed information about the snowpack: 

Guided group of 8 on overnight mountaineering trip to Matterhorn peak Horse Creek drainage area. Trail had intermitted snow strating at 7500 feet. We hit skinable conditions before the third bench at 8600 feet, made camp around 9500 feet. Snow depts at camp ranged from 30cm to 60 cm on E facing slopes snow varried from hard wind pack to 2 cm brakeable crust with faceted layers underneath. Light to moderate N winds were felt most of the hike in on Friday (12/15) with visiable blowing snow in higher elevation. Moderate to heavy (gusts to 25mph) were felt that night. We traveled up near base of Materhorn peak on Saturday (12/16). It was lightly snowing (mixture of small stellars and graupel S-1 and S1 at times) and cold temps (-9 to -11*C) for most of the morning. Dug quick pit on NE faceing slope at 10400 feet. Snow depth was 110 cm on the 25* slope with a boot pen of 14 cm. We had positive results with propagation 40cm down in snow pack (CT22, ECTP28). This was a Q1 planar windpacked 1F block on 4F packed facets and decomposed particles. We then returned to camp.  Snow slowed and stopped around 2 pm and cold tempts remained for the rest of saturday (12/16) pushing into -15*C late that night. Calm cold sunny conditions were felt on Sunday morning (12/17). Blowing snow and spinning drifts could be seen in upper elevations but little to no wind could be felt on hike out.

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