For anyone looking at the weather stations this morning, you may have had the same reaction I did – Nooo, rain over 2,000′! A sinking reminder of last season. The storm system that rolled in last night is entraining warm subtropical air, more than forecast.
Considering this round of rain-on-snow affecting higher and drier snowpacks, we should see additional wet avalanche activity today. Many of these slides are confined to very steep terrain (pictured below), however we did have a report of a large full depth avalanche on the SW face of Max’s Mtn in Girdwood. We do not have a photo of the Max’s slide yet, but this is a popular ski/snowboard area.
Photos below: Debris reaching close to sea level in a slide path just South of Girdwood (left) and paths across the Arm (right). An example of how avalanches can affect snow-free zones.
*Snow conditions at Turnagain Pass yesterday were less than ideal for skiing/snowboarding; very wet and heavy unsupportable snow transitioned to moist and ‘punchy’ snow above treeline. Remember, snowmachining is still closed due to insufficient snow at the parking lot.
At the upper elevations it is snowing and blowing. The Sunburst anemometer (wind sensor) had a max gust of 109mph at 6:00 this morning!! Snowfall amounts are roughly 12-18″, with higher amounts in favored locations such as Girdwood and Portage Valleys. The snow cover is filling in up high with sticky Chugach Powder, which is great news. But, patience is warranted until the pack can adjust.
We saw very little natural avalanche activity from the Thanksgiving storm that deposited 14-16″ above treeline. However, we are still concerned we could see large ‘connected’ avalanches due to a layer of faceted snow at the base of the pack (formed during the cold snap). This layer is not uniform and only exists in scattered zones (Todd’s Bowl is a suspect). With a new load added today, we will be looking for not only avalanches but the character of them.
Photo below: Tincan Common Bowl is filling in (top of bowl is around 3,200′)
A number of glide cracks exist at mid-elevations on Turnagain pass, notably in areas such as the Tincan trees. Glide avalanches are very unpredictable and the recent warming temperatures and rain could cause a glide crack to release. Hence, travel under glide cracks should be limited.
As you can see in the charts below, well over an inch of rain fell at the mid-elevation snow stations last night. This storm system is expected to continue through today with another 1″ of rain below ~2,000′ and 10+” of snow at the upper elevations. Winds will remain Easterly with averages in the 30’s to 40’s mph. Temperatures should drop slightly today by a few degrees.
For the weekend, instability showers will be over us with a slightly lower rain/snow line. Skies may clear a bit as well for the weekend and the Easterly winds decrease. Stay tuned.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||34||0 (rain overnight)||1.4||25|
|Summit Lake (1400′)||36||0 (rain overnight)||0.5||10|
|Alyeska Mid (1700′)||34||0 (rain overnight)||1.6||18|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||29||SE||33||72|
|01/19/21||Turnagain||Avalanche: Cornbiscuit||Schauer/ Johnston-Bloom Forecaster|
|01/18/21||Turnagain||Observation: Turnagain Pass Road Obs.||A Schauer Forecaster|
|01/16/21||Turnagain||Avalanche: Tincan Trees||A Schauer Forecaster|
|01/15/21||Turnagain||Observation: Sunburst||Schauer/ Wunnicke Forecaster|
|01/13/21||Turnagain||Observation: Tincan||Johnston-Bloom / Moderow Forecaster|
|01/13/21||Turnagain||Observation: Center Ridge Meadows||Alaska Avalanche School Rec Level 1 Roberts|
|01/12/21||Turnagain||Avalanche: Seattle Ridge/Center Ridge||A Schauer Forecaster|
|01/11/21||Turnagain||Observation: Tincan Trees||Schauer/ Roberts Forecaster|
|01/10/21||Turnagain||Observation: Center Ridge Meadows||Alaska Avalanche School Pro 1 Course Latosuo|
|01/10/21||Turnagain||Avalanche: Tincan trees||Anonymous|
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.