Turnagain Pass Avalanche Forecast RSS

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ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Fri, November 29th, 2013 - 7:00AM
Expires
Sat, November 30th, 2013 - 7:00AM
Forecaster
Wendy Wagner
Avalanche risk The Bottom Line

Pockets of MODERATE  avalanche danger exist on steep, upper elevation slopes with recent wind loading. Winds have been consistently strong from the northwest and forming stiff, stubborn slabs in the foot deep category. Areas of most concern are steep slopes, approaching 40+deg, on south and easterly aspects. Otherwise, there is a  LOW avalanche danger in areas without recent wind deposited snow.

Below treeline the danger remains LOW  where 1-2ft of loose snow is capped by a breakable crust.

Special Announcements

All of Chugach National Forest remains closed to off-road motorized use due to a lack of sufficient snow cover.  Snowmachines will be permitted when the snow is deep enough to protect the ground underneath.

We need a couple more feet, give or take. Snow stake at Turnagain Pass shows one foot of snow.  

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Fri, November 29th, 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
  • 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

Ah, the pesky northwest winds. These rolled in Wednesday night and blew much of the 3-6″ of new light snow either back to the atmosphere (sublimation) or into hard and stiff wind slabs. As can be seen in the picture below, the snow surface is a mixed bag of wind effect above treeline.

Photo: Seattle Ridge ~2,500ft

There were a few natural wind slab avalanches seen that likely released Wednesday night along with the onset of the wind. These were fairly small in size and on easterly aspects above 3000ft. The largest slab seen was on a SE facing slope around 3500ft – photo below. This is a classic catchment zone for the predominant NW flow.

For anyone getting out into the Alpine today, watch for areas of recent wind deposited snow and cracking around you. The slabs we found yesterday were scattered near ridgelines and stiff and stubborn – meaning hard to crack and release. However, in steep terrain these could pose a real issue by letting a person get out onto the slab before it releases. Even small slabs can be a problem if they knock you off your feet and down a steep rocky chute for example. Yet, most of us are waiting for more snow before getting into these places.

Weather
Fri, November 29th, 2013

Cold, clear and windy describes both yesterday’s weather conditions and as well as today’s. Over the past 24 hours temperatures continue to hover in the single digits in most locations while they are dipping down to the minus single digits above 3,000ft. We should not see much of a warm up, if any, in temperature throughout the day. The frigid Northwest winds have not backed off a whole lot and are forecast to continue to blow in the 10-15 mph range with gusts in the 30’s. It should be a bright sunny day however!

Our next shot of snow is on the distant horizon. There is a system forecast to move through for the middle of next week. As to what track it takes and how much snow we might get, it is still too far out to tell.

Observations
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Riding Areas
Updated Fri, May 13th, 2022

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
Closed as of May 1 per Forest Plan.
Placer River
Closed
Closed as of April 25th due to insufficient snow coverage.
Skookum Drainage
Closed
Closed as of April 1st per Forest Plan.
Turnagain Pass
Open
Open. Extended opening through May 31.
Twentymile
Closed
Closed as of April 6th due to insufficient snow coverage.
Seward District
Carter Lake
Closed
Closed as of May 1 per Forest Plan.
Lost Lake Trail
Closed
Closed as of May 1 per Forest Plan.
Primrose Trail
Closed
Closed as of May 1 per Forest Plan.
Resurrection Pass Trail
Closed
Closed as of May 1 per Forest Plan.
Snug Harbor
Closed
Closed as of May 1 per Forest Plan.
South Fork Snow River Corridor
Closed
Closed as of May 1 per Forest Plan.
Summit Lake
Closed
Closed as of May 1 per Forest Plan.

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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.