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ARCHIVED - Forecasts expire after 24 hours.
Issued
Mon, January 27th, 2014 - 7:00AM
Expires
Tue, January 28th, 2014 - 7:00AM
Forecaster
Graham Predeger
Avalanche risk 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.  

Special Announcements

The Friends of the CNFAIC and the Rob Hammel family are sponsoring an avalanche education scholarship.  This is a great opportunity.  Deadline to apply is January 31st.  Go to this page for more information.  

Mon, January 27th, 2014
Alpine
Above 2,500'
4 - High
Avalanche risk
Treeline
1,000'-2,500'
4 - High
Avalanche risk
Below Treeline
Below 1,000'
4 - High
Avalanche risk
0 - No Rating
1 - Low
2 - Moderate
3 - Considerable
4 - High
5 - Extreme
Avalanche risk Avalanche risk Avalanche risk Avalanche risk Avalanche risk
Travel Advice Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features. Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern. Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding, and conservative decision-making essential. Very dangerous avalanche conditions. Travel in avalanche terrain not recommended. Extraordinarily dangerous avalanche conditions. Avoid all avalanche terrain.
Likelihood of Avalanches Natural and human-triggered avalanches unlikely. Natural avalanches unlikely; human-triggered avalanches possible. Natural avalanches possible; human-triggered avalanches likely. Natural avalanches likely; human-triggered avalanches very likely. Natural and human-triggered avalanches certain.
Avalanche Size and Distribution Small avalanches in isolated areas or extreme terrain. Small avalanches in specific areas; or large avalanches in isolated areas. Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas. Large avalanches in many areas; or very large avalanches in specific areas. Very large avalanches in many areas.
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
Recent Observations for Turnagain Pass
Date Region Location
02/24/24 Turnagain Observation: TinCan Backdoor/ Center Ridge
02/22/24 Turnagain Avalanche: Lynx Creek
02/22/24 Turnagain Observation: Turnagain, Seattle, Mt Ascension
02/21/24 Turnagain Observation: Tincan Trees
02/21/24 Turnagain Observation: Sunburst
02/20/24 Turnagain Avalanche: Tincan
02/20/24 Turnagain Observation: Seward Highway across from Johnson Pass TH
02/19/24 Turnagain Avalanche: Base of Seattle Ridge
02/18/24 Turnagain Observation: Lynx creek
02/18/24 Turnagain Observation: Tincan Trees
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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.