Refreezing on Mt. Judah

Location Name: 
Mt. Judah
Region: 
Donner Summit Area
Date and time of observation: 
Fri, 01/31/2014 - 13:00
Location Map: 
United States
39° 18' 30.7512" N, 120° 19' 10.398" W
US


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

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

Above 7500 ft. 15 to 20 cm of new snow rested on top of a 6 to 7 cm rain crust. Below this crust the old snowpack had started to refreeze. Some water still existed in the snowpack. Near the bottom of the pack, the old facet layers remained wet and soft. At the noted GPS point, one of the ECT tests I performed today showed that fractures could still propagate through this wet facet layer at the bottom of the snowpack. Other tests indicated that while the wet layer remains weak it is becoming more difficult for fractures to travel through the layer. Some minor skier triggered cracking also occurred today but the cracks did not extend very far away from my skis. Data showed that the snowpack is slowly refreezing and starting to gain strength.

Along Wildflower Ridge and the top of Judah, only small localized wind slabs existed. Ski cuts on wind loaded test slopes and small cornice pieces dropped onto wind loaded test slopes did not result in any failures.

Photo 1: The upper bowls of Judah - Numerous rocks remain exposed and only small wind slabs and cornices existed.

Photo 2: Minor cracking around my skis on a NE aspect at 7900 ft.

Video: ECT's and a PST from NE facing slopes between 7900 ft and 8100 ft. These show various degrees of propagation, however none of them fractured across the entire column. The test that did propagate occurred at 7800 ft on a NE aspect and is mentioned in the text above. 

Snowpack photos: 
Snowpit videos (tests, etc): 

ECT's and PST on Mt. Judah

Weather Observations
Blowing Snow: 
No
Cloud Cover: 
50% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Calm
Precipitation: 
Air temperature trend: 
Warming
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: