The last 3 weeks of clear and cool weather has helped to create very weak snow on the surface throughout the forecast area. A lack of significant loading from precipitation or wind has kept avalanche activity to a minimum. An exception to this was found over the weekend in the Girdwood Valley, where strong Northerly winds on Friday loaded fresh slabs onto this weak snow surface. Turnagain Pass was shielded by the Chugach Range from this outflow wind event.
What this leaves us with is a tale of two different snowpacks.
On Turnagain Pass, the core of the forecast area, you will find very shallow pockets of fresh slab 3-4” deep that have built as a result of light snowfall and moderate winds over the past 24 hours. Wind will help to build slabs as thick as 8” by the end of the day on leeward slopes. These pockets could become deeper if additional snowfall exceeds the forecasted 2-3” snow for today.
In the Girdwood Valley you can expect to encounter stiff wind slabs in the mid to upper elevations that are several days old. These slabs are hard and sitting on very weak snow. These slabs will grow slightly today with average depth in the 6-8″ range. It is important to be able to recognize wind loaded features. Wind loaded slopes will feel stiff and sound hollow. Shooting cracks radiating from your skis, board or feet are an obvious indicator of unstable snow.
In areas not affected by wind, expect sluffing to occur easily in steep terrain. New low density snow combined with the older weak snow will be easy to trigger and low in volume. If visibility allows travel into upper elevation steep terrain today, watch any sluff that you trigger and steer away from it.
A frontal boundary pushing up from the south has helped to bring about a change over the past 24 hours. Light amounts of snow have accumulated, with 2 € of new snow on Turnagain Pass. Temperatures have seen a pronounced upswing, with ridgetop stations reading in the teens to 20 F range this morning. Winds out of the East have also picked up with Sunburst reporting averages in the teens to 20 mph overnight.
Today expect showery conditions. Snowfall amounts will be light, in the 2 € to 3 € range. Ridgetop winds will be out of the East at 10 to 15 mph. Temperatures at 1,000′ will be in the mid to high 20s F.
An unsettled pattern will help to bring chances for snow through the coming week. Temperatures will fluctuate and gradually rise as we move through the work week.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||11||2||.1||33|
|Summit Lake (1400′)||7||trace||trace||7|
|Alyeska Mid (1700′)||10||2.3||.12||24.5|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||12||var||6||18|
|05/06/20||Turnagain||Avalanche: Pastoral Peak, north face||Andy Duenow|
|04/10/20||Turnagain||Avalanche: Wolverine||Mike Records|
|04/10/20||Turnagain||Observation: Eddies lookers right shoulder||Matt Yoder|
|04/09/20||Turnagain||Observation: Bench Peak||Mike Records|
|04/04/20||Turnagain||Observation: Pete’s North||Anonymous|
|03/26/20||Turnagain||Avalanche: Tincan – Proper (SW facing)||CNFAIC Staff|
|03/26/20||Turnagain||Avalanche: Seattle Ridge||W Wagner Forecaster|
|03/25/20||Turnagain||Avalanche: Sunburst Uptrack @ 2000′||J. Boisvert|
|03/24/20||Turnagain||Observation: Turnagain – Road Observations||W Wagner Forecaster|
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: firstname.lastname@example.org
|Area||Status||Weather & Riding Conditions|
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.