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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
Mon, January 27th, 2014 - 7:00AM
Expires
Tue, January 28th, 2014 - 7:00AM
Forecaster
Graham Predeger
The Bottom Line

The danger today remains HIGH in the backcountry at all elevations and aspects.   Large natural avalanches are again likely and will consume the entire depth of the snowpack once initiated.  Temperatures continue to rise as I write this at 6 o’ clock this morning and will be the major culprit today as this January shed cycle continues for at least another day.

Avoidance is the best tactic right now and travel in avalanche terrain is not recommended. This includes staying well away from runout zones.  

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Mon, January 27th, 2014
Alpine
Above 2,500'
High (4)
Avalanche risk
Treeline
1,000'-2,500'
High (4)
Avalanche risk
Below Treeline
Below 1,000'
High (4)
Avalanche risk
Alpine
Above 2,500'
Avalanche risk
High (4)
Treeline
1,000'-2,500'
Avalanche risk
High (4)
Below Treeline
Below 1,000'
Avalanche risk
High (4)
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

The snowpack continued to degrade yesterday under a tenth consecutive day of unseasonably warm temperatures.  Wet slab and wet loose avalanches remain the primary concern as temperatures stay well above freezing again today. 

We have continued to see large natural avalanches in the Turnagain and Girdwood regions nearly everyday since the warm up began.  Yesterday was no exception as terrain on Pete’s South proved susceptible to the rain and warm temps.  The mercury continued to climb overnight and we are seeing our highest temperatures in well over 3 months this morning.

 

 

Temperatures @ 5AM in degrees Fahrenheit           

            Penguin Peak (4200’):  41

            Sunburst (3880’): 45

            Alyeska top of Quad (2800’):  50

            Seattle Ridge (2400’):  47

            Center Ridge (1880’):  52

Cold temperatures (well below 32F) and time are the only two factors that will bring us out of this period of elevated danger.  With unseasonably warm air and moderate amounts of rain again today, the snowpack will continue to lose strength and whither away from the valley floor moving up in elevation.  Travel in avalanche terrain again today is not recommended.  

Yesterday I saw people kayaking Six-mile Creek, road biking, ROCK-climbing and kite surfing along the Seward Highway.  Until winter returns to south-central Alaska, activities such as these are going to be the better (and probably more fun) alternative to recreating in the backcountry this June-uary.

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

In the upper elevations of our zone where precipitation has been falling primarily as snow, we have a deep slab (6’+) resting on what we know is a weak foundation.  Evidence of this deep slab problem presented itself on Saturday in the Girdwood Valley as pictured below.  Any avalanches initiated in upper elevations today will likely be triggered either by wind or a falling cornice.

Natural deep slab avalanche on Goat Mt. SE to SW facing with ~6,000′ starting zone.  Saturday Jan. 25th.

Additional Concern
  • Cornice
    Cornice
Cornice
Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.
More info at Avalanche.org

Winds have been moderate to strong over the last 2 weeks, primarily out of the east and southeast creating some large and unruly cornices on upper elevation west aspects.  Cornices are quite unpredictable and have a tendency to release during warming events.   

Weather
Mon, January 27th, 2014

Scattered rain showers returned to our region yesterday with temperatures cooling slightly from Saturday night/ Sunday morning.  The slight cooling was followed by rapid warming that began yesterday afternoon and continued into this morning (see Sunburst graph above) where all ridgetop stations are reporting temperatures greater than 40 degrees.  Winds have continued to blow predominantly from the east in the 30-50mph range.

With the passage of this current warm front today we can expect temperatures to drop slightly throughout the day to the mid to low 40’s at 1000′.  This slight cooling will not be nearly enough to shore up our snowpack, though it may drop our snowline down to around 2500′.  Precip amounts will be light today with our first chance of SNOW coming later tonight in the 1-3″ range above 1000′.  Ridgetop winds will continue in the 50-60mph range from the east.

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.