Avalanche Bulletin
更新日時: 2022/02/01 07:00
Niseko Yotei Yoichi Shiribeshi
Alpine Good アルパインの風下斜面の局所にスラブが形成しています。南向きの斜面では特に注意が必要です。Pockets of slab have formed in the alpine on lees slopes. Extra caution should be taken on Southerly aspects.
Treeline Good 急な斜面では小さい点発生雪崩が発生しえます。Steep terrain may produce low volume loose dry activity.
Below Treeline Good 安全な行動様式を使い、拡大しているグライドラックの危険に対処してください。Safe travel techniques should be used and be mindful of the ever-growing glide cracks.
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Please continue to take time to grasp the state of the boundary between fresh snow and old snow. On the north side, where the wind is weak, you can enjoy a good glide, but on the south side the crust may disturb it. Be wary of glide cracks that expand at lower elevations. Continue to take the time to test the new old snow interface. Protected Northerly Aspects will ski and ride well while you may feel the crust in the South. Lower down glide cracks continue to grow.
Avalanche Problem
急斜面での点発生雪崩に対処するため、一般的な安全行動を使ってください。雪崩の発生の可能性は限られた地形のみであり、その量も少ないと評価されています。Regular safe travel techniques are required to manage loose dry activity in steep terrain. Any activity is expected to be isolated and low volume.
ウインドスラブ Wind slab
スラブの形成に適した速度の西～北西の風によって、標高の高い風下斜面の局所にウインドスラブが形成しています。先週の好天時に形成した融解凍結クラストが、このウインドスラブによいすべり面となります。With plenty of available snow to transport moderate West to North West winds have created low volume pockets of slab on lee slopes at higher elevations. A temperature crust formed during the broken sunshine last week is now providing a bed surface for these slabs to slide on across the Southerly solar aspects.
概要
Avalanche
Yesterday (1/31), there was a human-induced avalanche on the southeastern slope of Mt. Shiribetsu. The runner induces on convex terrain, and the depth of the fracture surface is 30-50 cm. The runner was able to quickly escape from the slab, so there were no injuries. According to the observations of the parties, it seems that this slab originated at the boundary with the thawing frozen crust. Thank you for sending me your observations. Information can also be sent directly to the Forecaster Team (forecasters@nadare.jp). A human-triggered avalanche was reported on the 31st on a South Easterly aspect on Mt Shirebetsu dake. This avalanche was triggered as the skier went over a convex roll and the crown wall was approximately 30 - 50 cm deep. The skier that triggered the slide could immediately ski off the slab and was unharmed. The Group's observations were that 30 - 60cm of cold denser snow was overlying a crust on This aspect. Thank you for sending the observations, the forecast team can be contacted directly with any observations at forecasters@nadare.jp.
Snowpack
We are focusing on the combined state of fresh snow and old snow deposited on the south side. Moderate winds created a soft slab with a thickness of about 60 cm above the thawing frozen crust formed by solar radiation last week. It can be seen that at lower elevations, snow is sintered and the snow cover is stable. As expected our concern with the pack is focused on the bond of the latest new snow across the Southerly aspects. Moderate winds have created pockets of soft slab at higher elevations up to 60cm that Overlay a crust formed as the sun shone last week. Lower, the snowpack appears strong and well rounded.
Weather
At the beginning of this week, a series of snowfalls will be interrupted, and it is forecast that it will be muddy for the next few days. The wind seems to be a weak to moderate westerly wind. After daily top-ups of fresh snow, it is likely that we will see a brief break in snowfall for the early part of the week with broken clouds expected over the next few days. Winds will remain low to Moderate from the West.
