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Turnagain Pass Avalanche Forecast RSS

Archives
ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Tue, November 26th, 2013 - 7:00AM
Expires
Wed, November 27th, 2013 - 7:00AM
Forecaster
Kevin Wright
The Bottom Line

The  MODERATE  danger rating above treeline is going to stay with us due to the persistent nature of our problem.  Natural avalanche activity is unlikely, but skier triggered avalanches are possible on steeper slopes in the higher elevations.  Due to thin snow cover, avalanches have been relatively low volume despite reasonably large propagation width in the last few days.  Slab depth is ranging from  6″-20″.  

Below treeline is  LOW danger with very thin snow coverage and crust.

The next advisory will be on Thursday, Thanksgiving day.  We do not expect major changes in the forecast for Wednesday.  

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Tue, November 26th, 2013
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

The old surface that we were skiing a week ago is the current weak layer, with the November 21st storm snow failing on those loose faceted grains.  See this observation for a detailed look at the snowpack structure.  Since the storm on Friday we have had 3 decent avalanches reported to us, and keep in mind that few people are skiing south of Anchorage right now.  All of these avalanche events are behaving in a similar nature, breaking on the storm interface from November 21st.  The storm snow is heavier and denser than the underlying layer of weak faceted snow, making this failure easy to identify in snowpit tests.  Reports from a couple days ago were identifying failure on isolation or with very light force.  

The picture below is actually from the Summit Lake area, but shows a similar problem farther south on the Kenai.  See this observation for another picture from that reported avalanche.

We expect this kind of avalanche potential to stay for a little while longer.  Time, warm temperatures, and continued storm cycles will eventually fix the problem.  Until then, caution is warranted when deciding where to go right now.  Also keep in mind that the snowpack is shallow.  Rocks and trees are barely covered, if at all.  

Weather
Tue, November 26th, 2013

There is no new snow in the last 24 hours.  Temperatures are in the high 20s.  Wind is light.  

The National Weather Service continues to have light snowfall in the forecast.  1-3 inches of snow is possible today as a weak surface low enters Prince William Sound this morning.  

Temperatures will stay near freezing in the mountains and perhaps rising above freezing near sea level.  Wind will stay light and variable, 10-20 mph.

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Riding Areas
Updated Mon, October 26th, 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
Glacier District
Johnson Pass
Closed
Placer River
Closed
Skookum Drainage
Closed
Turnagain Pass
Closed
Twentymile
Closed
Seward District
Carter Lake
Closed
Lost Lake Trail
Closed
Primrose Trail
Closed
Resurrection Pass Trail
Closed
Snug Harbor
Closed
South Fork Snow River Corridor
Closed
Summit Lake
Closed

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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.