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Avalanche Advisory

Turnagain Area Avalanche Advisory
Forecaster:   Kevin Wright  
Wednesday, February 15th 2012
Created: Feb 15th 6:59 am
3 Considerable Alpine / Above 2,500' Travel Advice: Dangerous avalanche conditions. Careful snowpack evaluation, cautious routefinding and conservative decision-making essential.
3 Considerable Treeline / 1,000'-2,500' Travel Advice: Dangerous avalanche conditions. Careful snowpack evaluation, cautious routefinding and conservative decision-making essential.
3 Considerable Below Treeline / Below 1,000' Travel Advice: Dangerous avalanche conditions. Careful snowpack evaluation, cautious routefinding and conservative decision-making essential.
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SLR Consulting
The Bottom Line
Good morning. This is Kevin Wright with the Chugach National Forest Avalanche Information Center on Wednesday, February 15th at 7am. This will serve as 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).

BOTTOM LINE
Its storming again. Avalanche danger is also back on the increase today. We can expect at least a CONSIDERABLE danger above treeline while the blizzard continues. Some areas may reach HIGH danger where the snowfall and wind are most intense during this storm.

AVALANCHE DISCUSSION
The sunny break in the weather yesterday gave us a good look around and a short-lived drop in the avalanche danger. Turnagain Pass seems to have stayed mostly intact from the recent storm, but areas that got more snow such as Girdwood showed a handful of larger natural avalanches from the storm cycle. The most impressive avalanche that we saw was on the North face of Alyeska peak, where the Moneys dropped a slab 10-15 feet deep. It created a class 4 avalanche that covered many acres with debris and snapped some mature trees. Light and dry snow was allowing even point releases to run quite far.

The likelihood of avalanching had a marked decrease yesterday as colder temperatures set the new loose snow into place. Explosive triggers were mostly ineffective 8 hours after the storm ended.

Today we have anCNFAIC Staff storm thats already deposited 4 inches of new snow. A blizzard warning is in effect for Turnagain Arm, and up to a foot of snow is forecasted for today. High wind is back with ridgetop gusts expected to reach 75mph.

The avalanche forecast today is easy. Storm snow is building on partially settled storm snow from 36 hours ago. Heavy snowfall with high wind will be increasing the avalanche danger. We can expect likely human triggered avalanches above treeline in wind loaded areas. Natural avalanches will be possible in steep wind loaded zones at high elevation, and could run far and fast.


MOUNTAIN WEATHER
A blizzard warning is in effect until noon today through Portage valley and Turnagain Arm. Snow is falling in Girdwood and Turnagain Pass and will continue through today. An east wind with gusts to 75mph will accompany the snow. Snow totals are predicted at 6-12 inches in the mountains with only 0.4 inches of water equivalent. Temperatures should stay cold, with snow all the way to sea level.

The current storm system is a product of a deep stationary low just South of the Alaska peninsula. Our region is currently being hit by a front spun off from that larger storm. We can expect more of the same pattern through the week.

CNFAIC Weather Page and the NWS forecast

Wendy will issue the next advisory Thursday morning. If you get out in the backcountry we want to know what you are seeing. Please send us your observations using the button at the top of this page or give us a call at 754-2369. Thanks and have a great day.

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 18, 2017 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: Closed
Placer River: Closed
Skookum Drainage: Closed
Turnagain Pass: ClosedOnly a few inches of snow sits at the motorized lot, not enough to open for snowmachining at this time. Updated Nov. 18, 2017
Twentymile: Closed
Seward District
Carter Lake: Closed
Lost Lake Trail: Closed
Primrose Trail: Closed
Resurrection Pass Trail: ClosedResurrection Pass trail is expected to 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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