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Avalanche Advisory

Turnagain Area Avalanche Advisory
Forecaster:   John Fitzgerald  
Saturday, January 17th 2015
Created: Jan 17th 6:42 am
2 Moderate Alpine / Above 2,500' Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
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
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Special Announcement

The CNFAIC Avalanche Rescue Workshop schedule for January 18th has been canceled due to lack of snow at the parking lot level in Turnagain Pass. The next hands-on rescue workshop is scheduled for Saturday February 7th.  Please check our calendar for up to date info.


The Bottom Line

The avalanche danger is MODERATE in starting zones in the Alpine today.  Wind slabs 1 foot in depth with isolated pockets up to 3’ deep could be triggered by riders and skiers on slopes over 35 degrees.

The danger is generally LOW at Treeline, where a previously weak snowpack has refrozen on the surface.  Avalanches are unlikely in this mid elevation band (1,000-2,500’).  Exceptions to this will be in the form of glide avalanches which can be found scattered throughout the forecast area around the 2,500’ level.  Avoid glide cracks as they can release at any time without the typical warning signs.

Despite it being mid-January, early season conditions exist.  Expect to hike to about 1,500' before being on snow.  Rocks, stumps, and open water are hazards to contend with in the lower and mid elevations.


Primary Concern

Yesterday my partner and I watched upper elevation starting zones being actively loaded by moderate winds out of the East.  These slabs will mostly be in the 1 foot range today with areas holding deeper pockets up to 3’.  Reactivity of these slabs will be on the decline throughout the day.  If you find yourself venturing into high elevation starting zones approach with caution.  It will take slope angles greater than 35 degrees to get slabs to release.  Watch for shooting cracks and check under the surface to see how well the new snow is bonding.


Secondary Concern

Glide cracks have been opening up over the past 2 weeks around the forecast area on all aspects.  Most of the activity is in the mid elevations, around 2,500’.  We were able to see some newer cracks yesterday that had formed during this past week.  Glide avalanches are unpredictable and require avoidance, as they can release at anytime.  Glide avalanches don’t behave the same as new snow instabilities like wind slabs.  Simply knowing where glide cracks exist is half the battle.  Check the observations page for more info.

Photo: Glide crack that opened up sometime in the past week on Tincan, below Common Bowl.

Tincan glide


Mountain Weather

Temperatures over the past 24 hours have cooled with freezing levels hovering around the 1,000-1,500’ level this morning.  Showery precipitation brought 1” of new snow above 1,500’ and rain below.  Winds have slowed down overnight with ridgetop stations reporting speeds in the 5-10 mph range this morning out of the East.

Today expect cloudy skies with light precipitation.  Snow accumulation will be minimal with 1-2” expected.  Rain/snow line will be around the 1,000’-1,500’ level.  Winds will be in the 5-10 mph range out of the East/Southeast.  Temps at 1,000 will climb into the mid 30s before cooling back down again overnight.

The general pattern will remain unsettled through the long weekend.  Expect rain and snow showers, light winds and temperatures to remain mild.

*Seattle wind data is 6 am-12am due to station malfunction.

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

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880') 32 1 .1 30
Summit Lake (1400') 32 0 0 5
Alyeska Mid (1700') 33 .3 .2 18

 

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

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812') 26 E 16 47
Seattle Ridge(2400') 27 VAR* 14* 33*

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

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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
© 2017 Chugach National Forest Avalanche Information Center. All rights reserved.
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