Upper Horse Creek

Location Name: 
Upper Horse Creek
Region: 
Other Area
Date and time of avalanche (best estimate if unknown): 
Thu, 03/07/2019 - 08:00
Location Map: 


Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Rapid warming

Observation made by: Public
Avalanche Observations
Avalanche Type: 
Dry
Slab
Trigger type: 
Natural
Crown Height: 
2 ft
Aspect: 
North
Weak Layer: 
Unknown
Avalanche Width: 
800ft.
Terrain: 
Above Treeline
Elevation: 
11 000ft.
Bed Surface: 
Old Snow
Avalanche Length: 
300ft.
Number of people caught: 
0
Did the avalanche hit a building, vehicle, or structure?: 
No
More detailed information about the avalanche: 

Spotted this natural wind slab this morning between the Matterhorn and the Doodad in Upper Horse Creek.  Approx. R3 D3.  Guessing it failed at the old snow surface or via graupel pooling.  

This was the only significant avalanche we spotted in the Twin Lakes vicinity this morning.  Remnants of loose wet activity were apparent beneath steep terrain below 9K.  

Snowpit or crown profile photo or graph: 
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
Clear
Air temperature: 
Below Freezing
Wind Speed: 
Moderate
Precipitation: 
None
Air temperature trend: 
Warming
Wind Direction: 
West
Accumulation rate: 
None
More detailed information about the weather: 

Gusty M-S winds at the lake shore around 5am persisted until around 8am at 10K.  They tappered quickly post 8am and were C-L at all elevations sampled shortly thereafter.