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Avalanche Advisory

Turnagain Area Avalanche Advisory
Forecaster:   John Fitzgerald  
Saturday, January 31st 2015
Created: Jan 31st 5:44 am
1 Low Alpine / Above 2,500' Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
1 Low Treeline / 1,000'-2,500' Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
0 NO RATING Below Treeline / Below 1,000'
 Show the Complete North American Avalanche Danger Scale
Alyeska Resort
Special Announcement

Scientists from the Snow and Avalanche Lab at Montana State University are seeking more participants for their project examining decision making and travel in avalanche terrain. Their project aims to collect GPS information (from your smartphone) and survey responses from backcountry skiers and riders to better understand what types of terrain are used, and how decisions are made.
To Participate or get more information:  www.montana.edu/snowscience/tracks  or their companion site directed toward snowmachiners at: www.montana.edu/snowscience/sleds


The Bottom Line

The avalanche danger is LOW in the Alpine and Treeline elevations today.  It will be possible to trigger low volume dry and wet loose avalanches in steep upper elevation terrain.

Early season conditions exist on the approaches; slick surfaces, rocks, and stumps require careful travel into and out of the mountains today.


Primary Concern

It has now been two weeks since the weather has delivered any significant loading.  Several inches of low density snow sit on the surface in many locations.  With the current snowpack set up, it will still be important to clue into the following minor issues:

Loose Snow Avalanches-
Both dry and damp sluffing will be possible in steep terrain.  Volume of these sluffs will be very low.  If venturing onto steep and large unsupported slopes pay attention to any loose snow that releases.  On sunlit aspects expect sluffs to move slow and entrain enough snow to knock you over.  This issue will be more serious if traveling above terrain traps such as cliffs, gullies or vegetation.

Wind slabs -
Isolated pockets of older wind slab  6-8” deep may be encountered when getting into higher elevation terrain.  Areas on the periphery of the forecast zone (Girdwood Valley and Summit Lake) may be harboring more of these pockets.  For those taking advantage of the pleasant conditions and getting into the high alpine, it will be important to be on the lookout for these slabs.

Glide Avalanches-
Glide cracks are scattered around the forecast area.  Figuring out the timing of their release is very difficult at best.  With warm temps and sunshine the possibility exists for glides to release.  But really it’s anyone’s guess.  These avalanches do not follow the normal rules of avalanche release.  With this in mind do your best to minimize time spent under any glide cracks.


Mountain Weather

Yesterday’s theme was clear, calm and mild.  Ridgetop temperatures were in the 20s F with some valley locations experiencing an inversion and cooler temps.  Winds were light out of the Northeast.  No new precipitation fell.

High pressure covering a majority of mainland Alaska will keep conditions similar for today.  Clear skies, very light wind and relatively mild temps are on tap.  The sun combined with mild air temps will be a destabilizing factor today as ridegtop temps look to climb into the low 30s F.

The extended outlook is calling for a continuation of this pattern through the weekend.  High pressure over the area will keep all moisture well to our South as we head into the early part of the week.

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

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880') 25 0 0 31
Summit Lake (1400') 14 0 0 8
Alyeska Mid (1700') 19 0 0 19

 

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

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812') 26 ENE 4 13
Seattle Ridge(2400') 26 VAR 3 10

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

Subscribe to the Turnagain Area Avalanche Advisory:

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
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