Turnagain Pass Avalanche Forecast RSS

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ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Fri, March 17th, 2017 - 7:00AM
Expires
Sat, March 18th, 2017 - 7:00AM
Forecaster
Heather Thamm
The Bottom Line

A LOW  avalanche danger remains in the backcountry  at all elevations. Although triggering an avalanche is unlikely, it is not impossible on steep wind loaded features and in extreme terrain.  Be aware of old hard wind slabs and fast moving €˜sluff’ in steep terrain where getting knocked over could have high consequences. Cornices and glide cracks exist in some areas and limiting exposure under these is recommended.

Good travel habits remain important, even during ‘green light conditions’. This includes exposing only one person at a time on a slope, watching your partners closely and having an escape route planned in case the snow moves.  

Summit Lake, South of Johnson Pass and North (in parts of the Girdwood Valley):  A reminder that the snowpack remains thinner in these areas with a poor structure. There is still a chance for triggering an avalanche deeper in the snowpack in these areas. Read the Saturday Summit Summary  HERE  and an observation from Fresno Ridge  HERE.

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Fri, March 17th, 2017
Alpine
Above 2,500'
Low (1)
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
Low (1)
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
  • Normal Caution
    Normal Caution
Normal Caution
Normal Caution means triggering an avalanche is unlikely but not impossible.
More info at Avalanche.org

Happy St. Patrick’s Day! A small pot of gold was found yesterday in the Spencer Glacier area where a few inches of snow fell early yesterday morning. For the rest of our region surface conditions are made up primarily of thin crusts, hard wind board on ridges and near surface facets (recycled powder) in areas sheltered from the recent winds. Although the avalanche danger is LOW, there are a handful of avalanche problems that could catch you off guard in dangerous terrain. Be aware of the following:

Wind Slabs:  In places that received a few inches of snow yesterday watch for blowing snow and shooting cracks where newly formed shallow wind slabs could be tender today. Older, stiffer wind slabs such as the one triggered on Seattle ridge last weekend will be less likely to trigger by a skier or snowmachiner. Smooth pillowed snow on steep unsupported features or in rocky areas will be the most suspect places to initiate an old wind slab.  

Loose Snow Avalanches (Sluffs): Dry sluffs on steep slopes are probable and have been fast moving this week.  Keep terrain choices and potential consequences in mind when managing sluff.

Glide Avalanches: Glide cracks continue to slowly open above popular terrain on Seattle Ridge and in other zones across the advisory area. These may release at any time.  Minimize exposure time spent under visible cracks.

Cornices: Cornices should always be given an extra wide berth if travelling along a corniced ridge.  Like glide cracks, minimize your exposure time spent under these backcountry bombs. 

Persistent Slabs and Deep Slabs: There are various weak layers in our thin snowpack. Buried surface hoar sits 1-3+’ below the surface and faceted snow sits in the mid and base of the pack. Given plenty of time and a lack of changing weather, these weak layers (with varying degrees of strength) are in a ‘dormant stage’.  Although unlikely, an avalanche breaking deeper in the pack isn’t completely out of the question in areas such as Johnson Pass, Lynx Creek and in parts of Girdwood Valley (especially around Crow Pass).  A cornice fall or glide crack release could also be a large enough trigger to wake up one of these persistent slabs.  

Skier triggered sluff on the South Face of Sunburst.

 

“This is a video re-cap of the last month or so of weather in Alaska as seen from the GOES satellite imaging system. If you watch carefully you might actually be able to see our snowpack blowing into the Gulf…” Thanks Tobey Carmen for the timelapse.

Weather
Fri, March 17th, 2017

Yesterday morning skies were cloudy becoming clear and sunny by early afternoon. A few inches of snow fell near Spencer Glacier with only a few flakes spotted in the rest of our forecast zone. Daily warming increased from the single digits F into the low 20F’s mid day. Ridge top winds were light (5-10mph) from the North. Overnight temps near sea level dropped back into the single digits F.  

Another clear and sunny day is in our future. Day time warming may reach the mid 20F’s this afternoon. Night time temperatures should drop back into the single digits F.  Ridge top winds, 5-15mph from the Northwest are expected to reach their peak by mid-day. No precipitation is expected.  

Cold and clear weather is expected throughout the weekend as high pressure continues to persist over mainland, Alaska. A series of fronts moving through the Gulf may bring light snow showers to coastal areas by Sunday, but no measurable amount of precipitation is expected. This pattern is expected through mid week.

 PRECIPITATION 24-hour data (6am – 6am)

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880′) 9    0 0   59  
Summit Lake (1400′) 7   0   0   29  
Alyeska Mid (1700′) 11   0   0   56  

RIDGETOP 24-hour data (6am – 6am)

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812′) 13   N   3   10  
Seattle Ridge (2400′) 7   N   6   16  
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Riding Areas
Updated Mon, December 02nd, 2019

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.
Placer River
Closed
Closed.
Skookum Drainage
Closed
Closed.
Turnagain Pass
Closed
Closed.
Twentymile
Closed
Closed.
Seward District
Carter Lake
Closed
Closed.
Lost Lake Trail
Closed
Closed.
Primrose Trail
Closed
Closed.
Resurrection Pass Trail
Closed
Closed. Will be open for the 2019/20 season pending adequate snow cover.
Snug Harbor
Closed
Closed.
South Fork Snow River Corridor
Closed
Closed.
Summit Lake
Closed
Closed.

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