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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
Sat, January 25th, 2014 - 7:00AM
Expires
Sun, January 26th, 2014 - 7:00AM
Forecaster
Kevin Wright
The Bottom Line

A slight decrease in the danger rating is due to a temporary end in precipitation.  However, temperatures are holding steady or even increasing, which keeps the snowpack in an unstable condition.  CONSIDERABLE danger ratings can be found at all elevations.  The most dangerous areas are below the freezing line – 1000 to 3000 feet – in the zone where we still have a lot of snow but it’s been saturated with rain over the last week.  

This is an unusual (for January) and very dangerous avalanche problem.  Large full depth natural avalanches have been seen every day this week.  The weather that we need to make the mountains significantly safer will be colder temperatures, which isn’t in the cards for today. Traveling on and below steep terrain should be avoided today.

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Sat, January 25th, 2014
Alpine
Above 2,500'
Considerable (3)
Avalanche risk
Treeline
1,000'-2,500'
Considerable (3)
Avalanche risk
Below Treeline
Below 1,000'
Considerable (3)
Avalanche risk
Alpine
Above 2,500'
Avalanche risk
Considerable (3)
Treeline
1,000'-2,500'
Avalanche risk
Considerable (3)
Below Treeline
Below 1,000'
Avalanche risk
Considerable (3)
Danger Scale:
No Rating (0)
Low (1)
Moderate (2)
Considerable (3)
High (4)
Extreme (5)
Avalanche Problem 1
  • Wet Loose
    Wet Loose
Wet Loose
Wet Loose avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.
More info at Avalanche.org

One of the new big avalanches seen at Turnagain Pass was on Pete’s North.  The Southwest face pulled out full depth sometime Thursday afternoon to Friday morning.  

As long as we have warm temperatures, this kind of avalanche is possible.  It’s worth noting that these large destructive avalanches are happening across a huge region in southcentral Alaska.  Valdez is currently under seige with the Richardson highway closed (second photo below).  Check out this observation for more photos and video from the Summit Lake region.

Sun exposure today may have enough power to tip the balance on south facing slopes in the afternoon.

 

 

Pete’s North

Keystone Canyon on the Richardson highway, Friday Jan 24th.  From the City of Valdez Facebook page.

Avalanche Problem 2
  • Deep Persistent Slabs
    Deep Persistent Slabs
Deep Persistent Slabs
Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.
More info at Avalanche.org

At the bottom of our snowpack we still have weak snow from November that is making full depth avalanches a reality.  This is most obvious from 3000 feet elevation and below where rain-on-snow has created an especially difficult problem.  Even higher up, above the rain line, it’s been snowing for more than a week.  The snowpack at higher elevations is finally getting deep, but stability is in question until we have evidence to suggest it won’t slide.   Remember, before the storm that dumped many feet of snow on these slopes we had numerous natural and remote human triggered avalanches.  Now that the problem is buried deeper it may be harder to trigger but the consequences of resulting avalanches will be significantly worse.  

Weather
Sat, January 25th, 2014

The hose of pacific moisture that’s been hitting us for the past week has shifted back to the west for the time being.  Unseasonably warm temperatures continue today, some of the weather stations are currently at the highest we’ve seen all month.  Freezing level is expected to reach 4400 feet elevation again today.

Partly sunny skies are forecasted today.  Look for fog in the valleys.  Southeast to East wind blowing 42-61 mph at the ridgetops.  

6am temperatures

Center ridge snotel – 39 F

Sunburst – 32 F

Alyeska Max’s mt – 34 F

Observations
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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.