It’s not everyday that our avalanche problems are so obvious and visible to the naked eye but that seems to be the case today. Found on all aspects, glide cracks seem to be relegated to the 1,000’ – 2,500’ elevation band. Glide cracks are a strange beast that really are impossible to predict. Weather and other triggers such as humans or even explosives that we associate with other dangerous avalanche problems don’t seem to effect glides in the same way. There is no discernable pattern to predict a failure as they tend to fail naturally and on their own schedule. Sometimes a glide crack won’t release at all, and benignly just fill back in with snow. Knowing when or even whether a glide crack will avalanche is like asking is there “Life on Mars?” Maybe, though the jury is still out so in the meantime, take your protein pill and put your helmet on!
Glide cracks are best to be given a wide berth. Limit your exposure time spent underneath and if skiing in terrain with glide cracks, try and map them out before your decent so as not to end up directly on top of or inside one. Remember, when these do fail, they tend to be destructive, failing to the ground bringing the entirety of the snowpack with them.
Large glide crack as seen ysterday from the highway, lookers left in Tincan trees. There are a lot of glide cracks in the Turnagain zone right now, but perhaps none as obvious as this one.
This glide released likely sometime over the weekend on the SW face of Lipps. See more info and photos from Heather’s observation on 1/6.
Cornices have grown considerably during the past few weeks. Not only do they have the potential to fall naturally, but also to be triggered by the weight of a person or snowmachine. They can also trigger an avalanche below and, all in all, be VERY dangerous. Travel under or on them should be avoided. And remember, they have the tendency to break farther back from the ridge than expected.
We saw substantial winds over the weekend (30 – 70 mph from the east) and into yesterday that actively stripped windward slopes and built stiff windslabs in the alpine. These may be in the 1-3’ range today and are most likely to be triggered from a rock outcrop or shallow spots near the edge of a slab. Wind loaded slopes are visibly fat right now, pay attention to any red flags such as shooting cracks. If you do decide to ski or snowmachine on a wind loaded slope greater than 35 degrees, do so one at a time and ensure you’ve got an escape route and a safe zone picked out.
Yesterday was a balmy day across the advisory area. Temperatures hovered around 36 degrees at 1,000′ under mostly cloudy skies. Winds continued from the East yesterday in the 10-20mph range before dropping off substantially and switching direction (to NW) overnight. A few light flurries were seen at ridgetops but no accumulation to note.
Today our area will be influenced by a weak system moving east to west across southcentral AK. Skies will be mostly obscured with clouds and a few scattered rain and snow showers persisting but not expected to add up to any accumulation. Winds will be nearly non-existent (less than 10 mph) from the north with temperatures expected to be in the mid-30’s at 1,000′.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||33||0||.1||87|
|Summit Lake (1400′)||34||0||.1||27|
|Alyeska Mid (1700′)||33||0||.05||62|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||28||*N/A||*N/A||*N/A|
*A trip to Seattle ridge weather station yesterday found a broken anemometer due to heavy rime. We’ll be working to get a replacement installed as soon as possible.
|04/21/21||Turnagain||Observation: Sunburst||Schauer/ Behney Forecaster|
|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|
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.