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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
Sun, March 1st, 2015 - 7:00AM
Expires
Mon, March 2nd, 2015 - 7:00AM
Forecaster
Wendy Wagner
The Bottom Line

A MODERATE avalanche danger remains in the Alpine (above 2,500′) for slab avalanches ~2′ thick breaking in old weak faceted snow. This has been our most concerning avalanche problem lately and although the probability of triggering one of these slabs is on the low end, the consequences could be high. Safe travel protocol is key. Additionally, wet loose slides are possible on steep sunlit slopes in response to a sunny and warm day on tap. Although these will be shallow, they may release naturally and/or be easily triggered by a person.

Below 2,500′ the avalanche danger is LOW and triggering an avalanche is unlikely.

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Sun, March 1st, 2015
Alpine
Above 2,500'
Moderate (2)
Avalanche risk
Treeline
1,000'-2,500'
Low (1)
Avalanche risk
Below Treeline
Below 1,000'
No Rating (0)
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
No Rating (0)
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

Marvelous March begins today with sunscreen weather – sunny skies, warm temperatures and light Northwesterly winds. It has been just over a week now since the last storm brought snow to the mountains and rain to 1,500′. Skiing and riding at Turnagain Pass these days takes one through a variety of seasons in order to get to winter – amazing really. Many folks have been heading North to Hatcher Pass where more snow has been falling lately – check up on those conditions on the HPAC website.

If you are headed to Turnagain today, the main concern for triggering an avalanche lies in a buried weak layer of faceted snow, around 2′ deep. This layer has been buried for a couple weeks now and has gained strength and adjusted to its current load. The weak layer also is most prevalent from 2,500 – 3,000′. Above 3,000′ it is harder to find in our pits and if found, harder to trigger. All that said, it is still yellow light conditions in the Alpine. Facets just can’t be trusted and we can’t forget about them. Although the likelihood of triggering a slide is low, the resulting avalanche may be large and destructive. A couple things to keep in mind today:

1- Obvious clues, such as collapsing/whoomphing, may not be present until it’s too late

2- Mid-slope and mid-elevations are most suspect (around 3,000′)

3- Thin areas near rocks and rollovers are likely trigger spots

4- Large triggers are most likely to collapse the weak layer and potentially trigger an avalanche (such as several people close together).

5- Safe travel protocol! Exposing one person at time on a slope, watch your partners, have an escape route planned and discuss these thoughts with your group.

 

Forest walking at 1,200′ quickly goes to winter in the Alpine – Superbowl (headwall between Magnum and Cornbiscuit ridgelines)

   

Avalanche Problem 2
  • Dry Loose
    Dry Loose
Dry Loose
Dry Loose avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.
More info at Avalanche.org

Direct sunshine, warm temperatures and little wind are likely to bake the South facing slopes. Shallow wet (or damp) loose avalanches may be seen in the 3-4″ of loose snow sitting on the surface. These could release naturally or be easily triggered by a person. However, they should be easy to recognize and avoid. Be wary of sustained steep chutes or gullies where channeled debris could pile up larger than anticipated.

Weather
Sun, March 1st, 2015

It was a mild gray-bird day in the backcountry yesterday with overcast skies and light Easterly winds. Light snowfall, with some graupel in the mix, began in the late afternoon with a switch in wind direction to the West that was associated with a large-scale front moving through. From the few snow stations we have, it seems only a trace of snow was squeezed out of the front.

Skies have cleared overnight and valley fog has developed as a short lived ridge is building in currently. Mostly sunny skies should prevail today and continue through tomorrow while temperatures remain in the upper 20’s F on the ridgetops and near 35F at 1,000′. Ridgetop winds are expected to be around 10mph from the Northwest before becoming downright calm later in the day.  

Monday night into Tuesday and Wednesday another low-pressure system heads our way bringing warm air and moisture from the South. Rain/snow line with this event looks to be in the 1,500′ range and precipitation amounts are in the 1″ H20 category. Stay tuned.

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

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880′) 29   trace  0 39  
Summit Lake (1400′) 29   0    0 6  
Alyeska Mid (1700′) 30   0  0 22  

RIDGETOP 24-hour data (6am – 6am)

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812′) 24   E   8   23  
Seattle Ridge (2400′)  26 n/a   9   22  
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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
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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.