Another day of warm temps and steady rain continues to test our snowpack and our patience. Expect to put skis on at the snow line, around 1,500’ or higher. Once on the snow, the primary avalanche concern will come in the form of wet loose avalanches as the pack at these lower elevations is quite saturated and lacks structure. Several days of rain now has seasoned this elevation band and any wet loose avalanches should be a predictable problem encountered on steep (>35 degree) slopes. Anticipate these wet loose avalanches and avoid terrain traps if you choose to continue ascending toward higher elevations and winter! With increased elevation today through the rain zone, the potential exists to trigger a larger, wet (cohesive) slab avalanche where we have more structure in our snowpack. I’d expect this to be more of an issue in the 2,500 – 3,500’ zone.
If you are still climbing and have hit the 3,500’ mark you’ll likely be very wet at this point. We have very little info from upper elevations since this most recent storm hit. What we do know is that 4 days ago there was a very supportable surface crust prior to 3”+ of water (estimated 30 – 40” of snow above 3500’) and high winds (40 – 80 mph from the East on Sunburst). We lack info at this point to understand how well new snow is bonding to the pre-existing surface but expect to encounter fresh, potentially sensitive wind slabs on leeward slopes in the 3 – 5’ range above 4,000’. It’ll be important to pay attention to any red flags (recent avalanches, cracking or whumphing), conduct your own stability assessment and exercise caution and conservative decision-making if travelling in the highest reaches of the forecast area today. Dangerous avalanche conditions are likely to exist as we are still within an active weather pattern.
Glide avalanches have been active across the Turnagain zone in steep terrain below 3,000’ since last weekend. These have been observed littered across the eastern face of Seattle ridge, Eddies (including the final steep pitch on the SW Face), and Corn Biscuit. Glide avalanches are impossible to predict when they may release so it’s best to simply avoid your exposure to any glide cracks as much as possible. In channeled terrain, such as below Seattle ridge debris has been observed running out to as low as about 1,200’ (well below the ‘snow-line’).
Yesterday marked the 8th day in a row of unseasonably warm temperatures across south-central Alaska with temps at Turnagain pass averaging 37 degrees. Last night we saw perhaps the peak intensity of this most recent storm with hourly rainfall amounts in the .1 - .2 € of water/ hour from Turnagain pass to Girdwood. Winds also picked up yesterday afternoon from the East with a max gust of 88mph at Sunburst.
Today looks to be more of the same with another 1 € or more of water forecasted, moderate winds from the east in the 20-40mph range and unseasonable warm (low 40's @ 1000') temperatures. The rain/ snow line is expected to drop (from roughly 2500') throughout the day as cooler air aloft filters into our region tonight and the possibility of a rain/ snow mix at 1000' by the evening hours.
After this current disturbance exits our region this evening we can expect temps to dip slightly to more €˜near-normal' by tomorrow and a chance of rain/ snow in the forecast thru Sunday.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880')||35||0||1.8||29|
|Summit Lake (1400')||36||0||.38||5|
|Alyeska Mid (1700')||36||0||2.3||19|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400')||30||NNW||22||62|
|05/18/21||Turnagain||Observation: Tincan Ridge||Joe Kurtak|
|04/30/21||Turnagain||Observation: Sunburst||W Wagner Forecaster|
|04/27/21||Turnagain||Observation: Tincan Ridge||Joe Kurtak|
|04/26/21||Turnagain||Observation: Magnum||Creighton/ Hoople|
|04/25/21||Turnagain||Observation: Sunburst||Nick D'Alessio|
|04/24/21||Turnagain||Observation: Airplane obs||Johnston-Bloom / DiJulia /Hilliard Forecaster|
|04/24/21||Turnagain||Observation: Corn biscuit||Heather Johnson|
|04/23/21||Turnagain||Avalanche: Lynx Ck Drainage||W Wagner Forecaster|
|04/23/21||Turnagain||Avalanche: Sunburst||Eeva Latosuo|
|04/23/21||Turnagain||Observation: Center Ridge Turnagain pass||Joe Kurtak|
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.