Loose Wet in Horse Creek

Location Name: 
Horse Creek
Date and time of avalanche (best estimate if unknown): 
Sun, 03/17/2019 - 14:00
Location Map: 


Red Flags: 
Rapid warming

Observation made by: Public
Avalanche Observations
Avalanche Type: 
Wet
Loose/Point-Release
Slope: 
42degrees
Trigger type: 
Natural
Crown Height: 
Less than 1 ft
Aspect: 
East
Weak Layer: 
Old Snow
Avalanche Width: 
250ft.
Terrain: 
Near Treeline
Elevation: 
9 675ft.
Bed Surface: 
Old Snow
Avalanche Length: 
700ft.
Number of similar avalanches: 
5-10
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: 

As the sun progresses overhead from East to West in the Southern sky slopes heat with direct rays accordingly. Photo #1 is of a rather large Loose Wet avalanche in the more West drainage of Horse Creek on an East aspect. Loose Wet avalanches of this size could bury a person. I ran into a guided group leaving upper horse who told me about another Loose Wet avalanche they had witnessed. They also dug a pit & found buried Graupel on the bottom of the first large headwall, I could not find any in my location. I found an average depth of snow to be 180cm with a solid melt-freeze crust 60cm down that was pencil+ hardness. Old Wind Slab crowns still linger in the upper cirque in ski terrain.

Avalanche Photos: 
Snowpit or crown profile photo or graph: 
WL-N-R2D2
Pinwheel
Weather Observations
Blowing Snow: 
No
Cloud Cover: 
Clear
Air temperature: 
Above Freezing
Wind Speed: 
Calm
Precipitation: 
None
Air temperature trend: 
Warming
Wind Direction: 
Accumulation rate: 
None
More detailed information about the weather: 

Most sun this winter with no winds. 6.6C was the shaded air temperature just below 10K'. Surface melting was occurung rapidly.