IB redflags

Post snow pack observations - snowpits, avalanche activity, signs of instability.
azroots
Posts: 7
Joined: January 2nd, 2011, 1:06 pm

IB redflags

Postby azroots » January 3rd, 2017, 8:47 pm

Climbed up to low saddle this morning. Had a few objectives in mind but quickly discovered red flags.
Recent wind loading has created consolidated slabs on lee ward sides of high elevation ridge lines. Very quickly found widespread cracking and large scale propagation as soon as we topped out on the ridge and approached north or east facing aspects.
Dug a pit on northeast facing slope around 11,700 feet just below ridge line. Performed ECT and found a very reactive layer about 5 inches below surface (recent wind load). Popped out with one or two small taps of the shovel. Wants to step down 6 more inches on top of surface hoar created after Christmas day storm.
We tucked tail and skied west facing at a lower elevation.

splitboarder
Posts: 174
Joined: November 9th, 2010, 9:07 pm
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Re: IB redflags

Postby splitboarder » January 4th, 2017, 8:52 am

Thanks for posting your observations! This is a big help to the NAZ BC community. Glad you were safe.
Interesting, i have seen some reactive graupel buried on top of a crust about a foot down on NE slopes of Fremont near 10800, but not any buried surface hoar...
Troy Marino is a splitboarder and on the KPAC board of directors.
KPAC Snow Summary.
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Kaptain Safe T
Posts: 315
Joined: October 30th, 2010, 8:57 am

Re: IB redflags

Postby Kaptain Safe T » January 4th, 2017, 10:15 am

Good Observations for sure....A few of us were on the West side at a lower elevation, 11500, found some reactivity in the top 10 cm of our pit....new snow wind effect? We also observed a couple hard layers near the bottom of our 120 cm pit where there was some strength bridging the 40 cms of basal faceting at the bottom....No propagation in our ECT nonetheless we opted for the trees on the West Slope I call the Procupine Ridge....into the temptations and out the Humphries trail....Still an early season snowpack but looking better every storm cycle.

raisingarizona
Posts: 172
Joined: November 28th, 2010, 8:01 am

Re: IB redflags

Postby raisingarizona » January 5th, 2017, 9:28 pm

It could have been graupel, we didn't have a confident conclusion on the positive bed surface layer.


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