A beautiful day is on tap with clear skies, temperatures in the teens to twenties, and light winds. Unfortunately, the warm temperatures and rain earlier this week have created a variable melt/rain crust on the surface throughout the forecast zone. The crust makes skiing and riding conditions challenging, especially at lower elevations. Below 1500′ yesterday we found a thin breakable crust over soft snow combined with marginal snow cover over alders. At higher elevations and in areas that had been exposed to strong winds from late last week the crust is supportable and travel conditions are a bit easier. The travel conditions are likely the biggest hazard of heading into the backcountry today, but remember that low danger does not mean no danger.
Strong winds at higher elevations yesterday were transporting what little snow was still available into fresh wind slabs. Since most of the snow surface is covered in shiny rain crust the fresh wind slabs stand out like a sore thumb, with a more matte appearance from very fine wind transported snow grains. On the few test rolls we found yesterday these wind slabs were fairly stubborn, but in steep terrain at higher elevations it will be possible to trigger a wind slab up to 1′ deep.
The warm temperatures also appear to have reactivated some of the glide cracks in the area (e.g. Seattle ridge) so be on the lookout for fresh glide activity. Identifying active versus inactive glide cracks can be tricky but you can look for visible dark ground surface in the cracks as an indication of recent activity. This is harder to do in areas with a thinner snowpack where older glide cracks have not been filled in as much, like on the southern end of the forecast area. If in doubt try to avoid spending time underneath these unpredictable hazards.
It has been over a month since we started talking about a weak layer of buried facets and it is now very unlikely for a person to trigger an avalanche 2-5+’ deep on this layer, but not impossible. In areas with a thinner overall snowpack, such as the southern end of the forecast area near Lynx Creek, Silvertip Drainage, and Johnson Pass, there is a higher likelihood because it is easier for the weight of a skier or rider to penetrate into the weak layer. The same is true for thin spots in the snowpack like near rocks or partially buried trees. One benefit of the melt/rain crust is that it should make triggering a deep persistent avalanche even more difficult. The amount of strength the crust added to the upper snowpack depends on it’s thickness. Lower elevation areas where there is a very thin crust over dry snow will have a gained less strength. We hope that the refreeze after a few days of warm and wet weather has put this weak layer to bed, but it is still on our radar due to the high consequences of triggering a deep persistent avalanche.
Yesterday: Clear skies with warms temps ranging from the twenties to low thirties. Winds were strong along ridgelines with gusts into the thirties yesterday morning. At lower elevations winds were moderate but still enough to transport some snow.
Today: Winds are currently still blowing out of the NW and gusting to 20 along ridgelines but they should die down by mid day, before switching directions to the S this evening ahead of a wave of precipitation. Skies should remain clear through the daylight hours before clouds and snow move into the area around 8 pm.
Tomorrow: Snowfall overnight and into the afternoon tomorrow, totaling 1-4″. Moderate winds out of the SE in the teens during the snowfall. Temperatures should remain in the teens to twenties with snowfall expected down to sea level. A period of light winds out of the NW and very cold temperatures should follow this short pulse of snow and persist through the weekend and into early next week.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||30||0||0||65|
|Summit Lake (1400′)||22||0||0.1||21|
|Alyeska Mid (1700′)||31||0||0||38|
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||26||NW||10||31|
|05/28/22||Turnagain||Avalanche: Turnagain Pass – late May wet slab cycle||CNFAIC Staff|
|05/21/22||Turnagain||Avalanche: Magnum, Lipps and Tincan||CNFAIC Staff|
|05/17/22||Turnagain||Avalanche: Sunburst||CNFAIC Staff|
|05/17/22||Turnagain||Observation: Tincan Ridge||Joe Kurtak|
|05/11/22||Turnagain||Avalanche: Cornbiscuit and Magnum west faces||CNFAIC Staff Forecaster|
|05/07/22||Turnagain||Observation: Granddaddy||Kit Barton|
|04/29/22||Turnagain||Observation: Sunburst wx station||AS/ MM/ AM/ NH|
|04/28/22||Turnagain||Observation: More Turnagain Pass/Summit Lake wet slab activity||Alex Marienthal|
|04/27/22||Turnagain||Observation: Magnum||Sykes / Buttrick Forecaster|
|04/27/22||Turnagain||Observation: Girdwood/Summit/Turnagain Road obs||A S|
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.