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ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Thu, January 9th, 2014 - 7:00AM
Expires
Fri, January 10th, 2014 - 7:00AM
Forecaster
Kevin Wright
The Bottom Line

Persistent slab concerns keep us at  CONSIDERABLE  above treeline.  The overall stability trend is very slowly improving, but large human triggered avalanches are still likely in specific areas.  Another avalanche near Summit Lake yesterday emphasizes that point.

Slopes above treeline, greater than 35 degrees, and in shallower areas or complex terrain should be avoided.  If an avalanche is triggered today, it is likely to be large, 2-3 feet deep, may be triggered remotely, and cause connected slopes to avalanche sympathetically.  

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Thu, January 9th, 2014
Alpine
Above 2,500'
Considerable (3)
Avalanche risk
Treeline
1,000'-2,500'
Moderate (2)
Avalanche risk
Below Treeline
Below 1,000'
Moderate (2)
Avalanche risk
Alpine
Above 2,500'
Avalanche risk
Considerable (3)
Treeline
1,000'-2,500'
Avalanche risk
Moderate (2)
Below Treeline
Below 1,000'
Avalanche risk
Moderate (2)
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 persistent slab problem continues to trend toward less likely, but large high consequence avalanches will result if triggered.  Snow pits are showing mixed results now…  Sometimes the layers are not reacting.  It’s worth keeping in mind that all pit information is overruled by other signs and symptoms.  Collapsing, or recent avalanche activity means that the snowpack is inherently unstable, and steeper slopes can slide.  

The photo below is from yesterday on Tenderfoot at Summit lake. Click here for a writeup and another photo. The Summit region is often a poor comparison to Turnagain Pass or Girdwood, but right now it represents what any shallower snowpack areas can do.  This is another remotely triggered avalanche, one of many in the past week.

Recent snowfall (over 2 feet of wet snow in the last 10 days) has now consolidated into a fairly strong and connected slab.  This is good because it is now more difficult for a person’s weight to penetrate that dense layer and collapse the weaker snow at or below the drizzle crust.  However, it’s bad because the resulting avalanche when a trigger point is found is now larger and more dangerous.  The likelihood of triggering has decreased, but the avalanche size and destructive force has increased.

Trigger points are likely to be shallower wind stripped pockets, possibly close to exposed rocks or trees.  

Weather
Thu, January 9th, 2014

A few inches of snow have accumulated since Tuesday.  In general, the weather has not contributed a lot to the avalanche danger since the larger storm on Saturday/Sunday.

Today, mostly cloudy skies are expected.  Isolated snow showers are in the forecast today and tomorrow, with little accumulation.  Wind should be light.  Temperatures continue in the 20s, with a slight decreasing trend on Friday.  

Watch for aurora displays tonight if the skies are clear enough.  A large solar storm may bring active displays to lower latitudes.  

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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.