Slab Avalanche

Location Name: 
108 Corridor
Region: 
BWRA
Date and time of avalanche (best estimate if unknown): 
Thu, 02/14/2019 - 05:53
Location Map: 


Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Obvious avalanche path

Observation made by: Avalanche Specialist
Avalanche Observations
Avalanche Type: 
Slab
Slope: 
50degrees
Trigger type: 
Natural
Crown Height: 
2 ft
Aspect: 
North
Weak Layer: 
Storm Snow
Avalanche Width: 
66ft.
Terrain: 
Below Treeline
Elevation: 
8 108ft.
Bed Surface: 
Storm Snow
Avalanche Length: 
100ft.
Number of similar avalanches: 
3
Number of people caught: 
0
Number of partial burials: 
0
Number of full burials: 
0
Did the avalanche hit a building, vehicle, or structure?: 
No
More detailed information about the avalanche: 

Yesterday's powder excursion grew deeper as we gained elevation. From the trailhead at 6800' there was a low density 25" of new snow. Around 8500' where we turned around at the Leavitt junction there was over 45". Loose dry avalanche activity had occurred along the roadside on steep slopes that had dropped snow from trees. Just beyond the 8000' elevation sign I noticed a recent Slab Avalanche on an adjacent slope across the river. It was a North facing rock outcrop that had a substantial amount of wind-loaded snow which had released naturally. From a distance of 250' away it was hard to tell if the R2D2 avalanche was from a Cornice falling or from a Wet Slab release. There were minor signs of the Strom Slab gaining desnity with very small cracks in wind effected drifts. Our day was an assessment of conditions & we did not venture under suspect terrain. The likelihood of Very Large Avalanches is still possible.

Snowpit or crown profile photo or graph: 
25" at trailhead
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Moderate
Precipitation: 
Snow
Air temperature trend: 
Static
Wind Direction: 
Southwest
Accumulation rate: 
Greater than 1 in. per hour
More detailed information about the weather: 

The snowfall rate was between S2-S3 & fairly consistent. Southwest winds were beginning to clam as the afternoon progressed but snow was still loading into areas. It appears that rains throughout the storm made it to over 8500' for a period then snow fell. The cold temps helped create the low density snow in amounts over 45" at 8500'.