Sun, March 13, 2016 Turnagain Pass Avalanche Forecast

Sun, March 13th, 2016

Alpine
Above 2,500'

Moderate (2)

Treeline
1,000'-2,500'

Moderate (2)

Below Treeline
Below 1,000'

No Rating (0)

Alpine Above 2,500'		Moderate (2)
Treeline 1,000'-2,500'		Moderate (2)
Below Treeline Below 1,000'		No Rating (0)

Danger Scale:

No Rating (0)

Low (1)

Moderate (2)

Considerable (3)

High (4)

Extreme (5)

Avalanche Problem 1

Wind Slabs

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

More info at Avalanche.org

Yesterday several skier-triggered and snowmachine-triggered wind slabs were observed in the mid and upper elevation zones following a storm that dumped 12” of new snow in the alpine on Friday. Most of these slides were small, with the exception of a skier triggered wind slab on the North side of Cornbiscuit that was big enough to bury a person. Luckily the terrain allowed the debris to fan out at the bottom and the ski tracks didn’t look like the person was caught. If anyone has info about this avalanche or any others consider sending in an observation, by clicking HERE.

Triggering a wind slab will be possible on slopes steeper than 35° and could easily take you for a ride in undesirable terrain. On solar aspects pay attention to how the sun is warming the surface snow and avoid steep slopes when the surface becomes damp. Active roller balls or water dripping from cornices are obvious signs the snow is becoming unstable. On shaded slopes ease into terrain with caution and avoid terrain with high consequences (terrain traps, rocks, and usupported slopes) where taking a ride could have a poor outcome.

A few other concerns to be aware of:

Loose snow: Don’t be surprised by loose snow sluffing on shaded aspects. Sluffing could be fast moving with the ability to entrain a significant amount of surface snow in big terrain.

Cornice falls: Very large cornice features loom over many ridgeline and have a tendency to break further back than expected. Give them lots of space, and limit time under them.

Skier triggered wind slab on the North side of Cornbiscuit as seen from the Sunburst parkinglot around 1:30pm yesterday.

Snowmachine triggered windslab on West aspect of Seattle Ridge. Photo by Graham Predeger

Skier triggered wet loose avalanche just above the ‘uptrack’ on Seattle Ridge.

Avalanche Problem 2

Glide Avalanches

Glide Avalanches

Glide Avalanches are the release of the entire snow cover as a result of gliding over the ground. Glide avalanches can be composed of wet, moist, or almost entirely dry snow. They typically occur in very specific paths, where the slope is steep enough and the ground surface is relatively smooth. They are often proceeded by full depth cracks (glide cracks), though the time between the appearance of a crack and an avalanche can vary between seconds and months. Glide avalanches are unlikely to be triggered by a person, are nearly impossible to forecast, and thus pose a hazard that is extremely difficult to manage.

More info at Avalanche.org

There were several new glide avalanches seen yesterday in Turnagain Pass and Girdwood, including a very large glide release on the North side of Eddies and a smaller one on the South side of Sharks Fin. Glide cracks cover all aspects within the mid elevation band and remain a significant threat to popular terrain. This avalanche problem is impossible to predict and is not associated with human triggers. As long as glide cracks continue to open up, move and release, we will stress the importance of avoiding them. AVOIDANCE IS THE ONLY WAY TO MANAGE THIS AVALANCHE PROBLEM.

Recent glide release on the North side of Eddies. Click HERE for more pictures of recent glides.

Natural Wind slab on South Face of Lipps along side a growing glide crack. Photo by Liz Repetto

Weather

Sun, March 13th, 2016

Yesterday skies were sunny and temperatures reached a high of 44.5F at Center Ridge Weather Station by 12pm.’ Winds were light from the East switching to the West by the afternoon. No precipitation fell yesterday.

Overnight temperatures dropped into the mid 20’s F. Ridgetop winds became East with a sudden increase from Light to Moderate this morning.

Today Easterly ridgetop winds are expected to be light and skies will be mostly sunny. Daytime temperatures could easily reach the high 30’s F to low 40’s F by early afternoon. There may be some valley fog in Turnagain Arm.

Tomorrow looks like another repeat of today; partly cloudy, warm daytime temps, and freezing temperatures overnight. Winds are expected to remain light.

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

	Temp Avg (F)	Snow (in)	Water (in)	Snow Depth (in)
Center Ridge (1880′)	32	0	0	138
Summit Lake (1400′)	30	0	0	42
Alyeska Mid (1700′)	32	0	0	107

RIDGETOP 24-hour data (6am – 6am)

	Temp Avg (F)	Wind Dir	Wind Avg (mph)	Wind Gust (mph)
Sunburst (3812′)	27	Variable	5	27
Seattle Ridge (2400′)	28	Variable	5	30

Observations

Recent Observations for Turnagain Pass

Date	Region	Location	Observer
05/22/23	Turnagain	Avalanche: Tincan	Nick D'Alessio
05/12/23	Turnagain	Avalanche: Tincan, Sunburst, Magnum, Cornbiscuit	Heather Thamm
05/07/23	Turnagain	Observation: Tincan – Bear Tracks	CNFAIC Staff
05/05/23	Turnagain	Observation: Seattle Ridge	AS/ WW Forecaster
05/02/23	Turnagain	Observation: Cornbiscuit	Schauer/ Sturgess Forecaster
05/02/23	Turnagain	Observation: Seward Hwy Turnagain Pass	Joel Curtis
04/30/23	Turnagain	Observation: Magnum	Ayla, Kit Crosby, Barton
04/29/23	Turnagain	Observation: Tincan	John Sykes
04/28/23	Turnagain	Avalanche: Taylor Pass/Pastoral	Schauer/ Creighton Forecaster
04/28/23	Turnagain	Avalanche: Tincan	Andy Moderow

Riding Areas

Updated Mon, May 15th, 2023

Status of riding areas across the Chugach NF is managed by the Glacier and Seward Ranger Districts, not avalanche center staff. Riding area information is posted as a public service to our users and updated based on snow depth and snow density to prevent resource damage at trailhead locations. Riding area questions contact: mailroom_r10_chugach@fs.fed.us

Area	Status	Weather & Riding Conditions
Glacier District
Johnson Pass	Closed	Closed May 15.
Placer River	Closed	Closed May 15.
Skookum Drainage	Closed	Will close to motorized use on April 1, 2023 per the National Forest Plan.
Turnagain Pass	Open	Chugach NF staff will be assessing daily after May 15th. Please keep machines on the snow and avoid brown spots to keep this area open as long as possible.
Twentymile	Closed	Scheduled closure May 1.
Seward District
Carter Lake	Closed	Scheduled closure May 1.
Lost Lake Trail	Closed	Scheduled closure May 1.
Primrose Trail	Closed	Scheduled closure May 1.
Resurrection Pass Trail	Closed	Closed to motorized use for the 2022/23 winter season per Forest Plan. Open next season.
Snug Harbor	Closed	Extended opening until May 15.
South Fork Snow River Corridor	Closed	Scheduled closure May 1.
Summit Lake	Closed	Scheduled closure May 1.