Leavitt Region

Location Name: 
Leavitt Region
Region: 
BWRA
Date and time of avalanche (best estimate if unknown): 
Fri, 03/23/2018 - 13:31
Location Map: 


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

Observation made by: Avalanche Specialist
Avalanche Observations
Avalanche Type: 
Dry
Slab
Slope: 
44degrees
Trigger type: 
Natural
Crown Height: 
More than 10 ft
Aspect: 
North
Weak Layer: 
Old Snow
Avalanche Width: 
1 800ft.
Terrain: 
Above Treeline
Elevation: 
9 800ft.
Bed Surface: 
Old Snow
Avalanche Length: 
600ft.
Number of similar avalanches: 
More than 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: 

Avalanche activity was rampant, mid & post storm. Very large avalanches were observed in various forms on the landscape. At elevations ~9000' rain lubricated the snowpack & sent Wet slabs down the "Repeat Offender" & the valley in "Big Easy Bowl". These avalanches were R3.5D3 in size & destructive force with the offender almost reaching Leavitt Rd. Big Easy ran almost 1000' pulling out Deep slabs on a convex rollover 8' deep. The Leavitt cirque was busy with moving snow & Marine activity. At ~13:00 Marines observed the southside of the Leavitt cirque having a large avalanche. A mixture of instabilities due to wind loading, storm slab & increasing sun intensity caused failure, giving the Marines a show. Crowns above the lake reached 13' deep on the west flank & debris can be found on the frozen lake. The deeper snowpack & continuous wind loading on NE aspects has made these slopes prime for avalanches. Be most cautious of the Deep slab avalanches which are difficult to detect & have detrimental outcomes even on small terrain features.

Avalanche Photos: 
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
25% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Strong
Precipitation: 
None
Air temperature trend: 
Warming
Wind Direction: 
Southwest
Accumulation rate: 
None
More detailed information about the weather: 

The winds were ferocious yesterday out of the SW & swirling. All day long huge banners of snow were blowing off ridgetops. Deposition & sublimation were taking place with most of the blown snow collecting on N-NE-E lee aspects. Although it was mostly sunny the windchill was low & blowing snow was melting on contact. Rain during the storm has degraded snow stability & riding quality. There is a complex slush dam across Hwy 108 just before the climbing wall near the campground. Good luck, its rather deep & the detour is a bit tricky.