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Avalanche Advisory

Turnagain Area Avalanche Advisory
Sunday, April 7th 2013 5:14 am by John Fitzgerald
ARCHIVED ADVISORY - All advisories expire after 24 hours from the posting date/time.
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The Bottom Line

The avalanche hazard is LOW above and below treeline.  There exists the possibility of triggering shallow pockets of wind slab in upper elevation starting zones.  In those isolated locations the hazard will be MODERATE today.


 Show the Complete North American Avalanche Danger Scale
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.
1 Low Below Treeline / Below 1,000' Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
Special Announcement

Are you going to Arctic Man this year?  Join Alaska Mining and Diving Supply, the Friends Group and CNFAIC Forecaster Graham Predeger for a free "Hoodoo Mountain Snowpack and Avalanche Assessment" field workshop on Wednesday afternoon!  Meet at the AMDS tent at 2PM for a fun and informative afternoon of snowpits and POW as we try to wrap our heads around what the primary avalanche concerns will be for the week!  Contact Graham at graham@chugachavalanche.org for more information.


Avalanche Problem 1

The weather pattern over the past day has left Turnagain Pass with little to show for in the way of new snow.  Because of this and the current/forecasted weather, the snowpack is stable in most areas.  It's important to remember that LOW hazard does not mean NO hazard.  While it would take an unusual event to produce an avalanche today, there are some issues to pay attention to:

Isolated pockets of wind slab.  The small amount of new snow that has fallen over the weekend sits on slick crusts on south aspects and surface hoar and facets on north aspects above ~3,500'.  With 2-3" of new snow & moderate winds forecasted for today, expect pockets up to 6" deep in leeward starting zones and above cross loaded gullies.  These slabs should not be a problem on their own, but could pose problems for people above terrain traps or in exposed terrain.

Cornices.  Keep your distance from cornices today.  Some of the largest avalanches we have seen in the region over the last month have been related to cornice fall.

Wet loose avalanches will be possible in the lower elevations as the temperatures rise.  These will be small in volume and more likely if the sun makes an apperance.


Mountain Weather

The mountains around Eastern Turnagain arm picked up ~2-3" of new snow over the past 24 hours.  Winds at the Sunburst weather station (3,812') averaged 11 mph out of the SE.  Temperatures there averaged 16.8 degrees F.

Today expect a mix of sun and cloudy skies with another 2-3" of snow possible.  Temperatures at 1,000' will be in the low to mid 30s F.  Ridgetop winds will pick up slightly and blow 15mph out of the S.

The extended outlook calls for a continuation of unsettled weather as we head into the early part of the week.

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Wendy will issue the next advisory tomorrow morning, April 8th.

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: Dec 01, 2018 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: ClosedClosed
Placer River: ClosedClosed
Skookum Drainage: ClosedClosed
Turnagain Pass: ClosedClosed November 21 due to inadequate snow conditions. #hopeforsnow
Twentymile: ClosedClosed
Seward District
Carter Lake: ClosedClosed
Lost Lake Trail: ClosedClosed
Primrose Trail: ClosedClosed
Resurrection Pass Trail: ClosedClosed for the 2018/19 season. Next season will be open to motorized use.
Snug Harbor: ClosedClosed
South Fork Snow River Corridor: ClosedClosed
Summit Lake: ClosedClosed

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
If you have comments or questions regarding CNFAIC operations or winter recreation management, please email staff@chugachavalanche.org
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