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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, January 2nd, 2014 - 7:00AM
Expires
Fri, January 3rd, 2014 - 7:00AM
Forecaster
Kevin Wright
The Bottom Line

New snow is still the big news for today.  The News Years eve storm produced an active avalanche cycle with natural avalanches during the peak of the wind and precipitation.  We are now on the decreasing trend of that spike in avalanche danger, but caution is still warranted.  

Avalanches were sometimes breaking in the old deeper layers, stripping out to crusts and facets from early season.  Other times they were isolated to the wind-blown storm snow, which was 2+ feet in drifted areas.  

Avalanches that we recorded yesterday – Eddies, Magnum, Cornbiscuit, Seattle ridge, Kern.  Explosive triggers produced slides into the D3 size range.

The challenge today is trying to predict how quickly our snowpack is adjusting and stabilizing to the new load.  Today will be more stable than yesterday, but some problems will be lurking…

A  MODERATE   avalanche danger will be found today, with steeper wind loaded slopes as the primary concern.

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Thu, January 2nd, 2014
Alpine
Above 2,500'
Moderate (2)
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
Moderate (2)
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
  • Wind Slabs
    Wind Slabs
Wind Slabs
Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.
More info at Avalanche.org

A lot of that storm snow from Dec 31st and Jan 1st came in with substantial wind.  Early in the storm we had several hours of gusts to 90mph or greater on Sunburst.  This means the storm snow is unevenly distributed, and the major problem lies in areas where the snow got drifted rather than scoured by the wind.  

Around Turnagain Pass the predominant wind direction was from the East.  West slopes and crossloaded North and South are the primary concern.  

Storm total amounts – starting Dec 31st

Turnagain Pass – 1.2″ H2O – 12″ snow

Alyeska mid – 1.64″ H2O – 14″ snow

Alyeska top – 2.74″ H2O  

Avalanche Problem 2
  • 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

When venturing into untracked snow yesterday we noticed a number of collapses (whumphing).  Deep shooting cracks were also evident.  These collapses are almost certainly happening in older weak layers, in the snow that fell in November or December.  The larger avalanches that happened yesterday had the greater volume because they are stripping deeper into the snowpack.  Deeper and more destructive avalanches will be less likely today, but present a greater concern to the backcountry traveler if one is triggered.  

Any collapsing felt today is a significant message and should be telling you to stay off nearby steep slopes.  

Weather
Thu, January 2nd, 2014

The last 24 hours have brought calmer weather.  Precipitation decreased significantly, but at least 3 inches of snow fell in the last 24 hours.  Wind has steadily dropped from strong yesterday to mild this morning.  Temperatures have also consistently decreased by a couple of degrees.

Mostly cloudy skies and snow showers are expected today.  Minimal snow accumulation.  Freezing rain is possible at the road elevation.  Look for light wind and steady temperatures in the 20s.  

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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.