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Avalanche Advisory

Turnagain Area Avalanche Advisory
Forecaster:   Wendy Wagner  
Thursday, November 27th 2014
Created: Nov 27th 5:36 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
 Show the Complete North American Avalanche Danger Scale
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Special Announcement

It is with heavy hearts that we announce the loss of one of Alaska's longtime avalanche forecasters, friend and colleague. Retired ADOT&PF avalanche forecaster Terry Onslow passed away on Tuesday, November 25th. This was two years and one day after ADOT&PF avalanche forecaster Rob Hammel left us. This is a sad time for the avalanche community and our thoughts and condolences go out to the family and friends of Terry.

Terry was the avalanche forecaster for ADOT&PF for 27 years! He was a leader in the artillery community and one of his crowning achievements was developing and continually improving the artillery program for ADOT&PF along the Seward Highway, Dalton Highway, Thane Road and Richardson Highway. His avalanche career also took him as far away as Russia to conduct an avalanche study of a mining operation. Prior to 1983, he worked as a patroller doing snow safety work at Big Sky Montana where he used to say he learned about facets and depth hoar. In his younger days, he was a ski racer on the icy slopes of the East Coast. 

We would like to take this opportunity today, Thanksgiving, to give thanks to all the avalanche forecasters and public safety workers that spend countless hours minimizing our risk as we travel along the Alaskan roads for various reasons, many of those reasons today being with family and friends.


The Bottom Line

The avalanche danger is LOW near and above treeline in the alpine zones. Below treeline continues to be snow-free. There is a potential for triggering a shallow wind slab in extreme terrain at the highest elevations. Additionally, sluffing in the top 5-7" of snow is possible on steep (> 40 degrees) continuous slopes.

*Early season hazards such as rocks, stumps, alders, small terrain features that are not filled in yet - you name it - are the biggest concern right now. How these hazards compare to Black Friday lines however, is another question.

The next advisory will be Saturday morning at 7am. 
Outlook for Friday:
Increasing cloud cover, continued light winds and little to no snow accumulation all point to Friday's avalanche conditions to be the same as today.


Primary Concern

As stated in the bottom line, the main concern if you venture into the backcountry will be early season/low snow cover hazards. Rocks, stumps, alders, etc. Below is a run down of snow depths vs. elevation:

1,000' (Turnagain Pass road elevation):  0-3 inches
2,000' (Treeline):  18" to 2 feet                                            
2,500' (Top of Treeline):  2 feet                                           
3,200' (Above Treeline - Alpine):  3 feet

The good news is a very stout crust exists in the middle of the pack with strong melt-freeze snow below, which is covering up many of the smaller rocks (Photo above). More details from CNFAIC's field day yesterday are HERE and HERE.

Wind Slab:
In high elevation extreme terrain, off ridgelines and peaks, there is the possibility of finding and triggering a wind slab. Watch for rounded stiff wind deposited snow that feels hollow. Also, be aware of what is below - cliffs/rocks - in the event even a small slab is triggered.

Loose Snow sluffs:
On steep slopes, 40 degrees and above, watch for sluffing in the settled snow from 11/22. Sluffs are expected to be low volume.


Mountain Weather

Yesterday we saw broken cloud cover and valley fog obscure much of the mountainous terrain. Winds were light from the Northwest and temperatures were in the mid 20's F above treeline.

Today, we can expect partly sunny skies with high clouds streaming in from the West. Ridgetop winds are expected to be light and variable. Temperatures have cooled off overnight and are expected to be in the teens near treeline and the low 20'sF on the ridgetops.

Tomorrow, Black Friday, we should see an increase in cloud cover, and possibly a flake or two, as rotating lows in the Bering move west and the associated frontal system begins to spill into Southcentral. This will continue to move our way and give us a chance for snow (to sea level!) Saturday and into Sunday.

 

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

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880') 23  18
Summit Lake (1400') 24 0
Alyeska Mid (1700') 24  9

 

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

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812') 20   W 12 
Seattle Ridge(2400') 19  var  4 11 

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: Nov 26, 2014 )

AREA STATUS WEATHER AND 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

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 regarding CNFAIC operations or winter recreation management, please email wendy@chugachavalanche.org
© 2014 Chugach National Forest Avalanche Information Center. All rights reserved.
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