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Avalanche Advisory

Turnagain Area Avalanche Advisory
Forecaster:   John Fitzgerald  
Monday, January 19th 2015
Created: Jan 19th 6:32 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
Special Announcement

Mark you calendars for January 23rd when the APU Outdoor Studies Department and Alaska Avalanche School present Winter Wildlands Alliance’s Backcountry Film Festival!! A night of entertainment, raffle prizes and a chance to rekindle our winter stoke is on tap. This is an AAS and F-CNFAIC fundraiser - a great way to support local avalanche education and information. Hope to see you there!


The Bottom Line

The avalanche danger is generally LOW in the Alpine.  Isolated pockets of old wind slab could be triggered in steep higher elevation terrain.  In steep terrain over 3,500’ be on the lookout for previously wind loaded pockets of slab 1-2' deep.  In this terrain the danger is MODERATE today.

At treeline the danger is LOW, where a once saturated snowpack has now mostly refrozen.  Avalanches in this zone are unlikely with glide avalanches being the exception.

Early season conditions exist in the treeline elevations (1,000’-2,500’).  You will encounter icy conditions along well traveled routes, exposed rocks & stumps and open water.  Use caution when traveling through this elevation band.


Primary Concern

For those willing to endure challenging approaches into the Alpine, favorable skiing and riding conditions exist.  The main avalanche concerns to contend with today will be isolated pockets of older wind slab and glide cracks/avalanches.  

Wind Slabs
Winds that ended 3 days ago (Jan 16th) loaded some starting zones in the upper elevations.  These slabs range from 1-2 feet in depth.  It will take slope angles approaching 40 degrees to find slabs that could be triggered by skiers and riders today.  This is an isolated problem but is worth keeping in mind if you are heading into high elevation steep terrain or to the periphery of the forecast area where we have less information (Girdwood & Summit Lake).

Glide Avalanches
Glide cracks are visible throughout the area.  Most cracks exist between 2,500-3,000’.  No releases were observed over the past 24 hours.  These avalanches can move downhill at any time and do not play by the normal rules of avalanche release.  Steer clear of glides and alter your route if you find yourself below these cracks, as my partner and I did yesterday on our way up to Magnum Ridge.

Glide crack at 2,700' S facing in PMS Bowl.  Photo: Fitzgerald

Glide PMS bowl

As always, it is important to use effective travel techniques in order to minimize your exposure:

Travel one at a time on suspect slopes.

Recognize and utilize islands of safety for spotting and regrouping.

Have an escape route planned in the event of an avalanche.

Communicate decisions and plans effectviely within your group.

Be aware of and minimize exposure of other groups that are above or below you.


Mountain Weather

Yesterday brought mostly clear skies with no precipitation.  Winds were light out of the Northwest and temperatures were more seasonable, with ridgetops averaging in the low 20s F.

Today expect similar conditions with occasional snow showers lasting into the evening hours.  Expect a trace to 2” of snow by tomorrow as a short wave disturbance moves through the area.  Winds today will be light out of the East at 5-10mph.  Temps at 1,000’ will be around 30 F.

Beyond tonight potential for snow will next come on Thursday.  Temperatures look to remain closer to normal over the next few days.

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

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880') N/A N/A N/A N/A
Summit Lake (1400') N/A N/A N/A N/A
Alyeska Mid (1700') 25 0 0 18.8

 

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

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812') 23 WNW 4 15
Seattle Ridge(2400') 25 N/A N/A N/A

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: Apr 28, 2017 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: Closed
Placer River: Closed
Skookum Drainage: ClosedSKOOKUM DRAINAGE CLOSED TO MOTORIZED USE ON APRIL 1 annually as per the Chugach National Forest Plan document.
Turnagain Pass: OpenOpen thru May 14th.
Twentymile: Closed
Seward District
Carter Lake: OpenClosed May 1.
Lost Lake Trail: OpenClosed May 1.
Primrose Trail: OpenClosed May 1.
Resurrection Pass Trail: ClosedClosed for 2016/17 winter season. This is a non-motorized season. This alternates every other year and will open again during the 2017/18 winter.
Snug Harbor: OpenClosed May 1.
South Fork Snow River Corridor: OpenClosed May 1.
Summit Lake: OpenClosed May 1.

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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