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Turnagain Pass Avalanche Forecast RSS

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ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Thu, December 20th, 2012 - 7:00AM
Expires
Fri, December 21st, 2012 - 7:00AM
Forecaster
John Fitzgerald
The Bottom Line

The hazard remains MODERATE above treeline.   Steep upper elevation starting zones are of most concern.   While it is getting more difficult to trigger avalanches the possibility still remains.   Below treeline the snowpack continues to get more and more rotten where the hazard is LOW today.

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Thu, December 20th, 2012
Alpine
Above 2,500'
Moderate (2)
Avalanche risk
Treeline
1,000'-2,500'
Low (1)
Avalanche risk
Below Treeline
Below 1,000'
Low (1)
Avalanche risk
Alpine
Above 2,500'
Avalanche risk
Moderate (2)
Treeline
1,000'-2,500'
Avalanche risk
Low (1)
Below Treeline
Below 1,000'
Avalanche risk
Low (1)
Danger Scale:
No Rating (0)
Low (1)
Moderate (2)
Considerable (3)
High (4)
Extreme (5)
Avalanche Problem 1
  • Persistent Slabs
    Persistent Slabs
Persistent Slabs
Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.
More info at Avalanche.org

It has been 4 days since a human triggered avalanche has been reported in the backcountry.  Yesterday my partner and I had a hard time finding snow that was reactive to our ski cuts and stability tests in our snowpits.  However, the snowpack in higher elevation starting zones continues to harbor a very weak base.  The slabs that are sitting on this base have been deteriorating over the past week of clear and cold weather.  As a result these slabs are becoming less reactive to the weight of a person or snowmachine.  Keep in mind that the distribution of this slab varies widely as you move around the mountains; in some places the slab is non existent and in others it is fully intact.  It is those areas with an intact slab that are of greatest concern.  While it is getting more difficult to find these areas they are still out there and warrant an accurate assessment.  Tracks on a slope do not guarantee that the snow is stable.

Weather
Thu, December 20th, 2012

Clear, cool and dry weather will dominate our area today.   Ridgetop winds will gust into the 20s and temps will warm to the teens.  
Our next chance for precip looks to be early next week at best.   Keep your fingers crossed!

Announcements
We would like to extend a special thanks to everyone who came out to support our avalanche center last night.   Thank you to Wild Alpine, Alyeska Resort and the Friends of the CNFAIC for hosting this event.   We here at the CNFAIC are excited to continue to deliver the info you need to make good decisions out in the backcountry!


This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area (this advisory does not apply to highways, railroads, or operating ski areas).  

Wendy will issue the next advisory Friday morning, December 21st.  

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Riding Areas
Updated Fri, May 01st, 2020

Status of riding areas across the Chugach NF is managed by the Glacier and Seward Ranger Districts, not avalanche center staff. Riding area information is posted as a public service to our users and updated based on snow depth and snow density to prevent resource damage at trailhead locations. Riding area questions contact: mailroom_r10_chugach@fs.fed.us

Area Status Weather & Riding Conditions
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Closed
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Closed
Turnagain Pass
Closed
Closed as of May 1. Thanks for a fun, safe season!
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Carter Lake
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This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area. This advisory does not apply to highways, railroads or operating ski areas.