WHUMPF... There it is! Winter is here and so are the avalanches. Snow falling over the past two days landed on a widespread layer of surface hoar. Surface hoar is a persistent weak layer, meaning it can be sensitive to triggering for a long time after being buried. Multiple parties yesterday triggered 10-15″ soft slabs in the Alpine. These were easily triggered, fast moving and running long distances. One skier was caught and carried, losing a ski and a pole. Lower angle terrain (18-25 degree slopes) was avalanching which is common with buried surface hoar and requires extra caution. The storm snow was fairly soft but as the wind moved it around it became more of a slab throughout the day and more reactive. Slabs could be even more developed today with additional snow, wind loading and time to stiffen. If this happens these may be more stubborn to trigger but may break above you when you are out on the slab. There is enough snow to take a bad ride if you are knocked off your feet, slide into a terrain trap or get pushed into high consequence terrain. As the first weekend with new snow there will be more people out in concentrated areas. Watch out for people around you and recognize that this surface hoar layer could be triggered remotely. Look for cracking and whumpfing and make conservative terrain choices today. In addition, look for drifted snow, listen for hollow sounds and avoid cornices. Use safe travel techniques and wear your rescue gear and don’t let your early season stoke cause you to make dangerous chioces today. There is a long season ahead of us!
1 cm surface hoar buried 10-15″ below the surface.
Skier triggered avalanches in Common Bowl on Tincan
Recent glide avalanches and cracks were observed prior to the recent storm. These may have been covered up but look out for and avoid traveling under glide cracks if you see them. Glide occurs when the entire snowpack slowly slides as a unit on the ground. Glide avalanches can be composed of wet, moist, or almost entirely dry snow and pose a hazard that is very difficult to forecast. They are often preceded by glide cracks (full depth cracks in the snowpack), though the time between the appearance of a crack and an avalanche can vary between seconds and months.
Glide avalanche on Sunburst last week. Glide activity was also observed Tuesday on Eddies.
Moisture spinning into the forecast area from the Gulf continues to produce snow. Yesterday was overcast with snow showers throughout the day. Winds were from the NE 10-20 mph gusting into the 30s. Temperatures above 1000′ were in the 20Fs.
Today will be mostly cloudy with a 60% chance of snow. 1-5 inches of new snow is possible as moisture is pushed into the mountains. NE winds will be light. Temperatures will be in the upper 20Fs. Snow showers continue overnight with temperatures around 18F.
Tomorrow will be similar with mostly cloudy skies, snow showers, light winds and temperatures in the 20Fs. An active pattern is forecasted to continue into next week. Stay tuned for more details.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||27||2||.2||18|
|Summit Lake (1400′)||27||2||.2||4|
|Alyeska Mid (1700′)||29||1.5||.15||3|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||24||ESE||3||10|
|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: email@example.com
|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.