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Avalanche Advisory

Turnagain Area Avalanche Advisory
Forecaster:   Heather Thamm  
Friday, January 30th 2015
Created: Jan 30th 5:54 am
1 Low Alpine Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
1 Low Treeline Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
0 NO RATING Below Treeline
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The Bottom Line

In Turnagain Pass the avalanche danger is LOW above 1500', both in the alpine and at treeline. LOW danger does not mean No danger; if venturing into extreme terrain isolated wind slab pockets 4-6” thick and loose snow avalanches could be found and triggered on slopes steeper than 40°. Both of these hazards are unlikely to bury a person, but could take you for a ride in undesirable terrain.

Below 1500’ only a few inches of snow covers the ground; not enough to issue an avalanche danger rating, but just enough snow to hide other hazards like rocks, ice, and dirt. 


Primary Concern

Surface instabilities

Wind slabs

Over the last week the weather has been relatively benign with some ridgetops seeing periods of sustained moderate winds. Shallow pockets of wind deposited snow can be found up to 6” in places.  These shallow wind slab pockets are sitting on poorly bonded faceted snow, but have been mostly non-reactive in the Turnagain Pass zone. Less information exists in Summit Lake, Portage, and Girdwood Valley as well as upper elevations above 4000’. Within this larger zone there are places that have received more exposure to wind and finding a tender wind slab is possible. A wind slab if triggered is unlikely to bury a person, but could take you for a ride in the wrong spot. Use caution in high consequence terrain steeper than 40°.

 

Loose Snow

Only a trace of new snow was measured in the last 24 hours with only an additional inch expected today. If we receive more than a few inches today, you may see “sluffing” on steep terrain. In general this is a low hazard, but if riding or skiing on slopes steeper than 40° pay attention. Loose snow with enough volume and momentum can knock you off your feet.  

 

Other Hazards

Glide Cracks

No new glide activity or movement has been observed in the last few days. New snow and poor visibility can make it difficult to identify areas with glide cracks present. Use safe travel protocols when stopping to take a break and be aware of your run-out distances from terrain above you. 

 

Low snow coverage 

Below 1500’ low snow coverage is deceiving with only a few inches of new snow covering rocks, ice and vegetation. Take your time getting in and out of the alpine today.

View looking from Seattle Ridge South with Sunburst in the distance. Coverage is thin in the valley bottom, but looks much more like winter!


Mountain Weather

Yesterday light snow fell throughout the day with only a trace of accumulation in both Girdwood and Turnagain Pass. Winds were light to moderate (5-15mph) from the East near Sunburst and Southwest at Seattle Ridge. Temperatures were in the low to mid 20’sF. 

Only a trace of snow is forecasted for today and skies are expected to clear this afternoon. Temps should be in the low to mid 20’sF. Ridgetop winds are expected to be light (5-10mph) from the Southeast.   

Tomorrow is looking very similar with more weak frontal air pushing into Western Prince William Sound. We may see scattered snow showers, but again we're only anticipating a trace of new snow. Winds should be light to moderate from the East with temperatures in the mid to low 20’sF. 

 

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

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880') 25  trace  <0.1  31 
Summit Lake (1400') 20  .2 
Alyeska Mid (1700') 23  trace  .03  19 

 

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

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812') 23  22 
Seattle Ridge(2400') 25  SW  18 

 

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: Jan 29, 2015 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: Closed
Placer River: Closed
Skookum Drainage: Closed
Turnagain Pass: ClosedWe are still lacking sufficent snow at highway elevations. Continue to check back here for the latest info on motorized openings on the Chugach National Forest.
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

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
© 2015 Chugach National Forest Avalanche Information Center. All rights reserved.
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