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Avalanche Advisory

Turnagain Area Avalanche Advisory
Forecaster:   Wendy Wagner  
Saturday, March 26th 2016
Created: Mar 26th 5:21 am
2 Moderate Alpine / Above 2,500' Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
3 Considerable Treeline / 1,000'-2,500' Travel Advice: Dangerous avalanche conditions. Careful snowpack evaluation, cautious routefinding and conservative decision-making essential.
0 NO RATING Below Treeline / Below 1,000'
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The Bottom Line

CONSIDERABLE avalanche danger remains at the mid-elevations on all aspects for glide avalanches in the Turnagain Pass, Girdwood Valley, Summit Lake and surrounding mountains. Glide cracks continue to release and produce large and destructive slides. Avoiding time under glide cracks is recommended.

At the upper elevations (above 3,000') there is a MODERATE avalanche danger where shallow wind slabs 6-8" thick may be found and possible to trigger. Watch for, and limit time under, cornices which are large and looming along ridgelines. Last, the sun may warm the surface enough for human triggered wet loose avalanches on southerly aspects.

*If you are headed to the Summit Lake area don't forget to check this morning's Summit Lake Summary.


Primary Concern

The snowpack continues to fall apart at the ground. Yesterday, another large glide crack released on the face of Seattle Ridge. If you are headed to Turnagain Pass this weekend you can't miss it, it's front and center, just across from the motorized parking lot. If you have not been to the 'Pass' for a while, you may be surprised at how many cracks litter the mid-elevations and how many of these have released. It goes without saying, staying out from under glide cracks is HIGHLY recommended! 

 

*With the unseasonably warm temperatures over the past week, the springtime melt-down (or shed-cycle) is closing in upon us. We do have cooler temperatures for today, and likely tonight, that will form surface crusts as high as 2,500', but it is good to remember that undreneath the pack is very wet and unsupportable at these mid-elevations. This 'rotten' soft snow, so to speak, is a red flag for not only the glide problem but for the potential for large wet slab and wet loose avalanches. 

Wet Loose Slides today? Southerly slopes seing direct sunlight may warm enough to melt the surface crust. In this case, wet loose slides could be triggered by people. Keep tabs on the surface conditions.


Secondary Concern

At elevations above 3,000' (above the majority of the glide crack/avalanche hazard) fairly dry snow exists. There was roughly 2-5" of new snow yesterday which sits on a mixture of old loose snow and old sun and wind crusts. Shallow wind slabs composed of mostly the new snow likely formed on leeward slopes during yesterday's moderate Easterly winds. These slabs should be ~6-8" thick and in pockets along ridgelines. Quick hand pits and watching the surface texture for smooth rounded wind pillows and drifts will help to find any relatively new wind slabs. 


Additional Concern

With a chance for direct sunshine today (and tomorrow) watch for cornices to weaken and possibly fall naturally. We have not seen much cornice failure recently but we do know these large features will begin to start calving soon. Limiting and avoiding time under cornices will be key as we head into springtime hazards.

If skies clear for travel above treeline, take stock of the slope or couloir you wish to ride/ski - is there a large cornice looming over you while you ascend/descend?


Mountain Weather

Yesterday's weather consisted of overcast skies with some light precipitation in the morning hours. Around .5" of rain fell up to 2,000' and between 2-5" of snow fell above 2,000'. Ridgetop winds were moderate, averaging to 20mph with gusts to 40mph from a generally East direction. Temperatures were in the mid-30's at 1,000' and upper 20's at 3,000'. Overnight, winds have died down substantially and temperatures have cooled off several degrees and move into a break between storms. 

For today, we are expecting partly cloudy skies, which could become quite clear by noon before a chance more clouds might move in later today (tough sky cover forecast). No precipitation is expected and winds are slated to be light to moderate from a Northerly direction, averaging 5-15mph. Temperatures should begin to climb again today as the sun comes out and reach up to 40F at 1,000'.

Sunday looks to be nice: mostly clear skies and light Northerly winds as a quick high pressure ridge builds before another low pressure system moves in Sunday night.

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

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880') 32  rain   0.5 124 
Summit Lake (1400') 35  rain  0.3  41 
Alyeska Mid (1700') 33  rain  0.3  105 

 

RIDGETOP 24-hour data (6am - 6am)

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812') 24  NE  11  40 
Seattle Ridge(2400') 27  SE  12  23 

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).

Winter snowmachine use open/closed status and riding conditions updates

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: May 16, 2017 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: Closed
Placer River: Closed
Skookum Drainage: Closed
Turnagain Pass: ClosedThanks all for a safe and fun season on the Chugach NF! Stay tuned for the 2017/18 season. #playsafe #snowtosealevel
Twentymile: Closed
Seward District
Carter Lake: Closed
Lost Lake Trail: Closed
Primrose Trail: Closed
Resurrection Pass Trail: ClosedResurrection Pass trail will be open to snowmachine use during the 2017/18 winter season.
Snug Harbor: Closed
South Fork Snow River Corridor: Closed
Summit Lake: Closed

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The information in this advisory is from the U.S. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur. This advisory provided by the Chugach National Forest, in partnership with Friends of the Chugach National Forest Avalanche Information Center.


USFS SNOW AND AVALANCHE HOTLINE (907) 754-2369
If you have comments or questions regarding CNFAIC operations or winter recreation management, please email staff@chugachavalanche.org
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