Observation: Magic Land/Boiler Bowl 2/8/2012

Observer Name: 
orum/kuhnly/weed
Region: 
Magic Land/Boiler Bowl
Steam Mill
Logan River
Logan
Observation Date: 
02/08/2012
Location or Route: 
Boiler Bowl to Magic Trees
Weather
Sky: 
Overcast
Precipitation: 
Light Snowfall
Wind Direction: 
Northwest
Wind Speed: 
Light
Weather Comments: 

Light snowfall in the higher country maybe 1", not much accumulation at Franklin Basin Trailhead.

Snow Characteristics

New Snow Depth: 
1"
New Snow Density: 
Low
Snow Surface Conditions: 
Powder
Faceted Loose
Melt-Freeze Crust
Snow Characteristic Comments: 

Near surface faceting plus some preserved buried surface hoar just below the fresh surface.

Red Flags

Recent Avalanches
Red Flag Comments: 

One of the old slides we found was probably from the January natural cycle.  North slope around 9100' running in some trees.  50-70' wide running about 200' hard slab 3' crown.  Could not produce a failure at the crown. Unknown if natural or skier released, there were ski tracks in the area. Tests in the Magic Land area 200 yds. skiers right of the old slide produced ECTX and CTM11Q2 on the facets.  Snowpack here was around 200cm with about 50cm of facets on the bottom.  We also had another pit producing a CTM15Q1 about 30cm down from the top possibly on buried surface hoar.  The slab seems to be becoming more stubborn leading us to believe it is getting better or just harder to trigger.  Still wary of big open slopes that have not released. 

Since all the apparent evidence of significant avalanche activity is now more than a couple weeks old, this is not really a red flag.  Poor snow structure in itself is unlisted, but it is certainly a good reason to reevaluate your plans if they include venturing onto slopes 35 degrees or steeper..

Primary Concern

Primary Concern: 
Persistent Slabs
Probability: 
Moderate
Aspect: 
North
Northeast
Northwest
Elevation: 
High
Mid
Trend: 
Same
Primary Concern Comments: 

Same old, same old those pesky facets.

 

In this area the suspect depth hoar is buried under a 1.5 meter slab.   A four or five foot deep hard slab avalanche is a scary thought, but the slab here is now so hard and thick that human weight probably won't be enough to collapse the underlying Colorado-like  weak layer.  The more West Coast-like slab was thick and heavy when it fell, and during the successive storms on January 18th through the 21st the nearby Tony Grove Snotel reported 8 inches of water accumulated in several feet of snow .   We've seen evidence of widespread and numerous natural avalanches that occurred during this event, and we received several reports of scary triggered avalanches in the first few days after the storm.  But, in the two-and-a-half weeks since the storm, the slab has gained considerable strength, even on slopes that didn't naturally avalanche during the  big cycle..  

I am getting more comfortable with the situation, but I'm still unwilling to get out on big steep slopes.. Riders, who are  obviously also getting more comfortable tested many suspects last weekend, and even with sled tracks visible on many steep slopes I haven't observed any deep slab avalanches recently and none were reported..  Toby

Secondary Concern

Secondary Concern: 
Loose Snow/Sluffing
Aspect: 
North
Northeast
Northwest
Elevation: 
High
Trend: 
Less Dangerous
Secondary Concern Comments: 

Had some loose snow sluffing.  This could be of concern if we get more snow tonight??

snow_profile_location: 
Comments - Photos - Videos (group 1)

Looking at Toby coming over the crown

lindseyBD2012 022.JPG
Video 1: 
Printer-friendly version
Comments - Photos - Videos (group 2)

starting zone reloading

lindseyBD2012 020.JPG
Comments - Photos - Videos (group 3)

run out through the people grater.

lindseyBD2012 021.JPG
Comments - Photos - Videos (group 4)

We saw evidence of fairly extensive natural avalanches from the January cycle in the Boiler Bowl Area...  We found a shallow rocky bed surface in the middle of the bowl, but little remaining evidence of a crown.  Cornice cuts on the east side of the bowl only produced new snow sluffing, but this area also showed signs of old hard slab activity.

Observed Danger Rating: 
Moderate
Forecast Danger Rating: 
Moderate

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