Dense slabs are spread across the forecast zone. These slabs are strong and can support a lot of weight. Underlying these slabs are a variety of weak layers. The most widespread of these layers is buried surface hoar, roughly 2’ down and found above 2,500’. We currently have a snowpack structure that shows some potential for slab avalanches.
On the plus side the strength of the slab in most areas is high, making it difficult to trigger an avalanche. Time and settling has allowed the buried weak layers to adjust to the slabs resting over them. While the likelihood of triggering an avalanche is on the low end of the scale, our tests continue to show us that propagation is still possible across slopes.
The best way to stay out of trouble today is to avoid suspected trigger points. These points are found on steep (>40 degree) rollovers and in areas where the snow is shallow. It is in these areas where it is easier for a person or group to impact the weak layer.
Dense wind slabs formed over the early part of this past week. These slabs (4-10″ thick) are generally well bonded to the surfaces below. However, it is worth keeping an eye out for the occasional pocket of stiff old wind slab, especially in very steep terrain. Jumping on steep rollovers on small test slopes is the best way to assess this avalanche concern. If venturing into more committing terrain, have an escape route in mind before moving over these slabs and be ready to ski or ride off of them.
With navigating around both of these avalanche concerns, continue to practice good travel habits. In steep terrain expose only one person at a time. Use islands of safety for re grouping. Have escape routes planned should an avalanche occur. Have a plan and communicate well within your group. Be mindful of and minimize exposure to groups below you.
Yesterday brought clear skies and more winter like temperatures to the area. Ridgetop winds were light out of the East/Northeast. Temps were in the teens to low 20s F. No new precipitation was recorded.
Today expect clouds and the occasional flurry this morning to give way to clear skies by the end of the day. Winds will be light out of the North at 5-10 mph. Temperatures will be on the decline, averaging in the 20s F at ridgetop level and dipping into the single digits F tonight.
High pressure will take hold over mainland Alaska for the next several days. This weather pattern will bring clear skies, cold temps and no precipitation.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||22||0||0||34|
|Summit Lake (1400′)||16||0||0||7|
|Alyeska Mid (1700′)||23||0||0||25|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||19||E||7||25|
|04/19/21||Turnagain||Avalanche: Triangle, Seattle creek||Will Morrison|
|04/18/21||Turnagain||Avalanche: Turnagain Pass Road Obs||Andy Moderow|
|04/18/21||Turnagain||Observation: Seattle Ridge, approximately 300 yards south of the up track||Brent Byrne|
|04/17/21||Turnagain||Avalanche: Road obs||Johnston-Bloom / Moderow Forecaster|
|04/16/21||Turnagain||Avalanche: Seattle Ridge||Wendy Wagner Forecaster|
|04/16/21||Turnagain||Avalanche: Turnagain Pass, non-motorized side seen from Seattle Ridge||CNFAIC Staff Forecaster|
|04/16/21||Turnagain||Observation: Sunburst||Lance breeding|
|04/15/21||Turnagain||Observation: Tincan||Schauer/ Rothman Forecaster|
|04/13/21||Turnagain||Observation: Turnagain Pass Road Obs||A Schauer Forecaster|
|04/12/21||Turnagain||Observation: Tincan||Johnston-Bloom / Latosuo 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.