Valanga

Pittsburg

Eric MurrowGunnison
Vedi sulla mappa

Quick report

Great, surfy pow conditions below treeline.  Recent natural avalanche activity near and above treeline demonstrates the dangerous conditions at upper elevations.  Below treeline terrain was quiet underfoot, but the Christmas crust now carries a dense, cohesive slab.  Snowpack tests and slab size kept our terrain choices conservative as we climbed above 10,000 feet.

We did not experience any cracking or collapsing. A few natural avalanches were visible near and above treeline while snowmobiling out the Slate River corridor.

Weather

Cloud Cover
few
Wind Loading
none
Recent Snowfall
22
Snow Avail For Transport
large amounts

Mostly clear skies, light wind's below treeline, and about 9ish inches of new snow.

Snowpack

I was out slashing pow for fun today, but dug a couple of profiles below treeline, checking in on the Christmas crust on northerly slopes below treeline now that 2+ feet of dense snow has accumulated on it.  Two profile sites, 10,400 and 10,550 feet (NE aspect), produced moderate propagating test results below the Christmas crust in the December drought facets.  The Christmas crust was about 1cm thick at this elevation, and we did not travel any higher.  I am uncertain how problematic this structure is around 10,500 feet, but it is less worrisome at lower elevations, where the crust becomes thicker, AND I would not want to travel on steep slopes any higher, where the crust thins as I suspect it's near a breaking point.

Avalanche

Size
D2 R2
Count
4
Aspect
NE
Trigger
N
Elevation
11700 ft

I suspect this is a Persistent Slab given the crown size.