Clear skies and good visibility will make it easier to travel into the alpine today. If you find yourself venturing into steep upper elevation terrain you will need to minimize your exposure and treat all slopes above 35 degrees with suspicion. A layer of buried surface hoar, which we have been tracking, remains intact on many slopes above 2,500’. Sitting on top of this layer are 2-3’ dense slabs.
These stiff slabs have the ability to support a lot of weight, especially where they are thickest. That all changes when you get onto thinner spots of a slab. It will be possible for multiple tracks to be put down on a slope without avalanching. It is important to know that tracks do not equate to stability.
This type of slab/weak layer combo is notorious for catching people off guard days and weeks after a storm. While we have seen signs of the weak layer gaining strength, we also have no snowpack information from any terrain above 3,500’.
If you decide to get onto bigger and steeper terrain today, it will be crucial to manage yourself and your group appropriately:
Avoid trigger points, such as steep rollovers and areas where the snowpack is thin.
Only expose one person at a time, utilize islands of safety, have an escape route, and communicate plans and decisions effectively.
Keep in mind that it’s a roll of the dice on all terrain over 35 degrees above 2,500′. Slabs have the potential to propagate across slopes and carry enough volume and speed to injure and bury a person.
If venturing into steep upper elevation terrain expect to encounter lingering unstable pockets of wind slab, especially on North aspects. High winds from 2 days ago formed upside down slabs up to 1 foot in depth. These slabs may be encountered in starting zones and along cross loaded gullies. Staying off of snow in steep terrain (over 40 degrees) that has a hollow sound or produces shooting cracks will be the best way in managing this concern today.
Yesterday was a mild day for weather around the area. Winds were calm to light, and predominantly out of the West/Northwest. Temperatures remained in the 20s F along ridge tops and around 30 F at sea level. No new precipitation was recorded.
Today expect mainly clear skies with some valley fog as a ridge of high pressure is stationed over the area. Ridge top winds will be light out of the Nothwest at 10 mph and temperatures at 1,000′ will be close to 30 F.
The next big weather event will involve warm and wet Southerly flow. Expect above normal temperatures with snow beginning Sunday night changing over to rain by Monday up into the mid elevations.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||28||0||0||30|
|Summit Lake (1400′)||25||0||0||7|
|Alyeska Mid (1700′)||29||0||0||24.1|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||24||variable||5||16|
|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.