Thursday, March 17th 2016 5:55 am by Heather Thamm
ARCHIVED ADVISORY - All advisories expire after 24 hours from the posting date/time.
The avalanche danger is MODERATE in the mid elevation band between 1000’-3000’ where glide cracks continue to release naturally and without warning. In the Alpine, a generally LOW avalanche danger exists, but due to the glide problem below terrain choices remain limited. Chose your routes wisely to avoid glide cracks, and be on the lookout for changing conditions that could raise the danger in the alpine.
|Show the Complete North American Avalanche Danger Scale|
|Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.|
|Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.|
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Making plans for Arctic Man 2016? Don't forget your beacon, shovel and probe! CNFAIC will be there all week and offering two FREE companion rescue workshops. Click HERE for more info. We hope to see you there!
Glide cracks continue to avalanche daily and without warning throughout our region. Yesterday we spoke with two snowboarders who witnessed a glide release on the SW face of Tincan while they were on the Sunburst ridge. New glides avalanche debris was seen on the SE side of Seattle Ridge, S face of Max’s, and several new ones in the Twentymile drainage.
Glide cracks cover all aspects within the mid elevation band (between 1000-3000’) and remain a significant threat to popular terrain. As long as glide cracks continue to open up, move and release, we will stress the importance of avoiding them, which is THE ONLY WAY TO MANAGE THIS AVALANCHE PROBLEM. Remember these are totally unpredictable, release naturally and could be deadly if you were to get caught-up in that amount of snow. It is the entire winter snowpack releasing at the ground.
A view of the SW aspect of Tincan where recent glide avalanches were observed yesterday from Sunburst. Click HERE to see more pictures of glide activity from the past week.
Penguin Ridge experienced a very active cycle this week. Keep in mind the debris can run into snow free areas and threaten some summer trails, especially around Girdwood Valley and Portage.
Yesterday 3” of new snow was observed above 2000’ and only a trace is expected today. Easterly ridgetop winds ranged from 10-20mph and a similar pattern is expected today. Should winds trend towards the later or exceed 20mph, there is enough snow available for transport the hazard could rise. Pay attention for blowing snow along ridgetops and how well this new snow is bonding the surfaces below. Be aware of how the sun is heating up the new snow on solar aspects and if you see any obvious signs of instability like shooting cracks or recent avalanches be prepared to change your plans. Remember LOW danger doesn’t mean NO danger, one of these avalanche problems is still possible in very steep terrain.
Wind slabs: Yesterday there were several short periods of sustained 10-20mph winds and we did find one very small pocket that produced a shallow shooting crack along the Sunburst Ridge. Be on the lookout for pillows of newly drifted snow and active wind loading - it is possible that steep terrain could harbor tender isolated wind slabs.
Loose snow: Sluffs are fast moving and will be proportional to the slope you are on today. Big terrain will yield big sluffs, particularly on cooler, drier northerly aspects. On slopes with a southern tilt, wet loose avalanches could be initiated later in the day if we get windows of sunshine. The biggest threat with both of these is the potential to get knocked off your feet in steep, committing terrain.
Cornice fall: Very large cornice features loom over many ridgeline and have a tendency to break further back than expected. Give them lots of space, and limit exposure time under them.
Yesterday skies were mostly sunny and mid elevation temperatures reached the low 40’s F. Ridgetop winds were light from the SW with a short period of moderate winds that switched to an Easterly direction mid-day. Overnight temps were in the 20’s F and no new precipitation was recorded.
Today isolated snow showers are only expected to bring a trace of new snow. Skies will be cloudy, but patches of blue sky are possible. Easterly ridgetop winds could range from 10-20mph today and temperatures may increase into the mid 30’s F mid-day.
Tomorrow a similar pattern is anticipated with the next possibility for snow fall Friday night into Saturday.
PRECIPITATION 24-hour data (6am - 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880')||31||0||0||134|
|Summit Lake (1400')||30||0||0||43|
|Alyeska Mid (1700')||31||trace||0.02||108|
RIDGETOP 24-hour data (6am - 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Sunburst (3812')||24||SW - E||9||38|
|Seattle Ridge(2400')||25||S - E||7||17|
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).
Riding status is not associated with avalanche danger. An area will be open to motorized use in accordance to the Forest Management Plan when snow coverage is adequate to protect underlying vegetation. Backcountry hazards including avalanche hazard are always present regardless of the open status of motorized use areas.
(Updated: Jan 05, 2018 )
|AREA||STATUS||WEATHER AND RIDING CONDITIONS|
|Turnagain Pass:||Open||Turnagain Pass motorized area is open. Early season shallow snow cover conditions exist. Please avoid riding on “Rookie Hill“ and other areas with exposed vegetation. Thank you!|
|Lost Lake Trail:||Closed|
|Resurrection Pass Trail:||Closed||Resurrection Pass trail will be open to snowmachine use during the 2017/18 winter season as soon as conditions warrant.|
|South Fork Snow River Corridor:||Closed|
SNOW AND AVALANCHE HOTLINE (907) 754-2369
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© 2018 Chugach National Forest Avalanche Information Center. All rights reserved.