Tue, April 02, 2013 Turnagain Pass Avalanche Forecast

Tue, April 2nd, 2013

Alpine
Above 2,500'

Moderate (2)

Treeline
1,000'-2,500'

Moderate (2)

Below Treeline
Below 1,000'

Moderate (2)

Alpine Above 2,500'		Moderate (2)
Treeline 1,000'-2,500'		Moderate (2)
Below Treeline Below 1,000'		Moderate (2)

Danger Scale:

No Rating (0)

Low (1)

Moderate (2)

Considerable (3)

High (4)

Extreme (5)

Avalanche Problem 1

Wet Loose

Wet Loose

Wet Loose avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

More info at Avalanche.org

Springtime sun and warm temperatures are ushering in April. We are in a melt freeze regime on all aspects below treeline and south, east and west aspects above treeline. Temperatures are showing a fairly decent refreeze overnight that should become softened by today’s sunshine. This can be seen on BeadedStream’s temperature profile at Center Ridge,1880ft. It takes a minute to digest the information but check it out – it’s really cool!

Avalanche activity yesterday was minimal but one notable slide did take place on Max’s Mountain in Girdwood (photo below). This slid sometime Monday and looks to be an old wind slab from Friday’s snow/wind. It is believed to be a natural triggered by yesterday’s sun and warm temperatures. It is that time of year where the snowpack is beginning its transition to summer and the sun and warm temperatures become a large player in destabilizing the pack. As is often stated: Once the snow becomes so soft that it doesn’t support your skis or sled it is high time to head for a shadier/cooler aspect.

Avalanche Problem 2

Cornice

Cornice

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.

More info at Avalanche.org

Cornices have been peeling off slowly the past few days and this trend is likely to continue with the warm weather. They have been triggering slabs from Friday’s snow over the weekend and as the pack fluctuates between freeze/thaw what is triggered by a cornice should fluctuate as well. Nonetheless, steering clear of these from both above and below is wise.

Additional concerns:
Wind Slab – Lingering wind slabs are suspect for those that are heading to steep north upper elevation slopes. One party found and triggered one of these on Sunday and sent in a great report.

Weather

Tue, April 2nd, 2013

Yesterday was our 3rd warm and partly sunny day since Friday when 8-12″ of snow fell over the region. During the past 24 hours winds have been light out of the northwest (~5mph gusting 15mph). Temperatures peaked yesterday in the mid 20’s F on the ridgelines and the upper 30’s at 1,000ft. Overnight temperatures have fallen, with what looks to be mostly clear skies, to the upper teens on the ridges and low 20’s at 1,000ft.

Today we can expect mostly sunny skies with a few clouds streaming in later in the day. We might hit the 40deg F mark at 2,000′ and the 32deg mark on the ridgelines. Winds are shifting around to the SE but look to remain light with gusts to 15mph.

There is a ridge of high pressure over interior Alaska that will stay in place through the week. This will keep mostly clear skies and light winds over our area.

Kevin will issue the next advisory tomorrow morning, April 3rd.

Observations

Recent Observations for Turnagain Pass

Date	Region	Location	Observer
05/21/22	Turnagain	Avalanche: Magnum, Lipps and Tincan	CNFAIC Staff
05/17/22	Turnagain	Avalanche: Sunburst	CNFAIC Staff
05/17/22	Turnagain	Observation: Tincan Ridge	Joe Kurtak
05/11/22	Turnagain	Avalanche: Cornbiscuit and Magnum west faces	CNFAIC Staff Forecaster
05/07/22	Turnagain	Observation: Granddaddy	Kit Barton
04/29/22	Turnagain	Observation: Sunburst wx station	AS/ MM/ AM/ NH
04/28/22	Turnagain	Observation: More Turnagain Pass/Summit Lake wet slab activity	Alex Marienthal
04/27/22	Turnagain	Observation: Magnum	Sykes / Buttrick Forecaster
04/27/22	Turnagain	Observation: Girdwood/Summit/Turnagain Road obs	A S
04/24/22	Turnagain	Avalanche: Seattle Ridge – large glide avalanche on Repeat Offender path	CNFAIC Staff Forecaster

Riding Areas

Updated Fri, May 13th, 2022

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 as of May 1 per Forest Plan.
Placer River	Closed	Closed as of April 25th due to insufficient snow coverage.
Skookum Drainage	Closed	Closed as of April 1st per Forest Plan.
Turnagain Pass	Open	Open. Extended opening through May 31.
Twentymile	Closed	Closed as of April 6th due to insufficient snow coverage.
Seward District
Carter Lake	Closed	Closed as of May 1 per Forest Plan.
Lost Lake Trail	Closed	Closed as of May 1 per Forest Plan.
Primrose Trail	Closed	Closed as of May 1 per Forest Plan.
Resurrection Pass Trail	Closed	Closed as of May 1 per Forest Plan.
Snug Harbor	Closed	Closed as of May 1 per Forest Plan.
South Fork Snow River Corridor	Closed	Closed as of May 1 per Forest Plan.
Summit Lake	Closed	Closed as of May 1 per Forest Plan.