Crow Creek: Another large avalanche was reported on Raggedtop, which makes the third avalanche in the same area in the past two weeks. The avalanche likely failed on a weak layer that was capped by a wind slab, and was triggered naturally. Nobody was caught in the slide.
|Signal Word||Size (D scale)||Simple Descriptor|
|Small||1||Unlikely to bury a person|
|Large||2||Can bury a person|
|Very Large||3||Can destroy a house|
|Historic||4 & 5||Can destroy part or all of a village|
As we head into April, we continue to get reports of slab avalanche activity and other red flags associated with buried surface hoar and facets in the upper snowpack. This kind of activity is a clear indicator that the persistent weak layers that formed and were subsequently buried in March are still reactive, and still need to be considered when traveling in the mountains. These layers require patience and careful terrain selection, which means weighing the consequences of triggering an avalanche on the slope you are considering. For now, the snowpack is really not trustworthy and it is important to avoid steep slopes, especially those with terrain traps like rocks, cliffs, gullies, or trees, or avalanche paths with large, connected start zones. The most suspect slopes will be those that have a stiffer wind slab at or near the surface. Pay attention to clear indicators of instability like cracks shooting out from your snowmachine or skis, or the ‘whumpf’ of a collapse in the snowpack. The calendar may say that it is springtime, but the snowpack is still presenting us with all of the challenges of a mid-winter pack.
Wind slabs: Light to moderate winds overnight have likely created isolated wind-loaded pockets that may be sensitive to triggers today. Be on the lookout in the typical suspect terrain- below ridgelines, convexities, or in cross-loaded gullies.
Loose snow avalanches: Steep slopes that have been sheltered from the wind have around a foot of loose snow sitting on top of firm surfaces. It will be easy to trigger dry loose avalanches (sluffs) today, and they can pick up enough volume and speed to carry a person. If the sun stays out long enough, we will likely see some wet loose activity as well. While it is unlikely they will be big enough to bury you, they can be dangerous if they drag you into terrain traps like cliffs, trees, rocks, or gullies.
Yesterday: Skies were partly cloudy to mostly sunny, with high temperatures in the high teens F at ridgetops to low 30’s F at lower elevations. Winds were out of the west at 5-15 mph, and no precipitation was recorded.
Today: Partly cloudy skies are expected, with high temperatures in the high teens to high 20’s F. Westerly winds at 10-15 mph are expected to calm to around 5 mph later in the morning. No precipitation is expected today.
Tomorrow: Clouds are expected to move in tonight as the weather begins to change. We might see a few flurries during the day tomorrow, with chances of precipitation increasing Saturday night into Sunday morning. Winds are expected to shift towards the south but stay light at 5-10 mph. Expect to see overnight lows in the low teens to 20 F, with daytime highs in the mid 20’s to low 30’s F.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||22||0||0||111|
|Summit Lake (1400′)||17||0||0||50|
|Alyeska Mid (1700′)||21||0||0||117|
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||16||NNE-W||4||10|
|04/12/21||Turnagain||Observation: Tincan||Johnston-Bloom / Latosuo Forecaster|
|04/10/21||Turnagain||Observation: north sides||lance breeding|
|04/09/21||Turnagain||Observation: Girdwood to Turnagain Road Observations||W Wagner Forecaster|
|04/05/21||Turnagain||Avalanche: Resort bowl Seattle creek head wall||Clint Kyffin|
|04/04/21||Turnagain||Observation: Center Ridge||Andy Moderow|
|04/03/21||Turnagain||Observation: Repeat Offender – Seattle Ridge||Troy Tempel|
|04/02/21||Turnagain||Observation: Seattle Ridge||Wagner / Schauer Forecaster|
|04/01/21||Turnagain||Observation: Pete’s||Schauer/ Cullen Forecaster|
|03/31/21||Turnagain||Observation: Tincan||Schauer/ Rothman Forecaster|
|03/30/21||Turnagain||Observation: Eddies||Johnston-Bloom / Kinney 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.