|Location:||$1000 Run & Bennett's Ridge|
Route & General Observations
Up $1000 Run and down Bennet’s Ridge to the road. Gorgeous sunny day to ski some rocks!
|Trigger||Skier||Avalanche Type||Hard Slab||Aspect||West|
|Elevation||4000ft||Slope Angle||38deg||Crown Depth||12in|
Observed the remotely triggered 12/19 HS-ASr-R4-D1.5 on West aspect of Bennetts Ridge. Appeared to be wind slab breaking on or sliding on a knife hard 1 mm crust (see photo). The pencil hard wind slab ranged from .75 -1.5 ft thick and sat over a very thin weak layer, perhaps a cm thick of P- rounding facets, which was on top of knife hard 1 mm crust. Under the crust was pencil hard snow. We did not dig further down but did a CT and could not get the wind slab to budge near the crown.
From $1000 Run, we noticed what may have been a skier remote triggered avalanche on a NE aspect at ~3,800 ft on Hatch Peak (see photo). The avalanche looked to have been triggered as the skier was skiing down and propagated up from the track and across quite a ways. It looked to be a hard slab that was several hundred feet across and ran several hundred feet. We did not go to see the bed surface as there was quite a bit of pillowed hang fire and we got a very large shooting crack near the vicinity of the base of the avalanche.
Obvious signs of instability
|Recent Avalanches?||Yes||Collapsing (Whumphing)?||Yes||Cracking (Shooting cracks)?||Yes|
Lots of whumphing and shooting cracks on the flats. One large, easily triggered shooting crack on a rollover off $1000 Run.
Light variable winds, no precip., sunny skies.
Wind affected snow everywhere, ranging from breakable crust to supportable knife hard, to sastrugi. A thin crust was found widely distributed (see photo). Many places on $1000 Run had been stripped to bare tundra that were not previously exposed.
Typical structure found in hand pits were 4F to P hard wind slab over 2-3mm depth hoar. Occasionally a crust would be found above the depth hoar, with 4F to F hard faceted snow between the crust and the wind slab.