Avalanche Bulletin
更新日時: 2022/01/08 07:00
Niseko Yotei Yoichi Shiribeshi
Alpine Fair アルパインで行動する際は賢い選択が必要です。特定の急斜面にはウインドスラブが形成しており、人の刺激に反応する脆弱性が残っています。稜線の下方にある風でパックされたような滑らかな斜面は避けたほうがいいでしょう。Smart choices are needed when choosing terrain in the alpine. Lingering weaknesses remain that are producing results in specific steep angled terrain where wind slabs that have formed early in the week appear to be reactive to moderate loads. Visual clues such as smooth wind-pressed pockets of slab below ridgeline should be avoided on lee slopes.
Treeline Fair 凸状や急な地形を避けて移動するようにしてください。この週末は樹林帯であっても良い雪が楽しめるはずです。Continued safe travel techniques should be used to avoid high consequence areas such as convex roles and steep angles features. Good turns should still be found in the trees over the weekend.
Below Treeline Good 森林帯では移動に関する一般的な注意事項を大切にしてください。regular safe travel techniques should be used below the treeline.
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Wind and snow continue for a week, and in certain terrain there remains a reaction to human stimuli. The choice of terrain is very important for the next few days. It is necessary to act cautiously, especially at high altitudes and in places where the wind influences are strong. There are places where glide cracks begin to open, but be vigilant as these cracks cannot be seen from the top of the slope. Reactive slabs appear to remain in specific terrain after a week of new snow and high winds. Terrain choice remains important in the coming days and taking a cautious approach Especially in the alpine and on high consequence terrain remains important. Glide cracks have begun to open in multiple areas across the region, these openings are not always visible from above.
Avalanche Problem
ウインドスラブ Wind slab
数日間の強風によって、地形局所にウインドスラブが形成しています。これらのスラブは稜線直下の急斜面で反応をみせています。Pockets of slabs have formed after multiple days of strong to gale-force winds have deposited fresh wind load on specific terrain on the lee. These slabs appear to be reactive on steep angled terrain below ridgeline.
概要
Avalanche
There was a report of the occurrence of size 3 (scale that destroys houses etc.) on the northeastern slope. The depth of the break is about 50 cm, the width is about 150 m, and it flows down about 500 m. This avalanche is thought to have been triggered by this week's snowfall shifted by the wind and the collapse of the cornice. However, it is not clear whether it is a natural occurrence or a man-made one. A size three avalanche (large enough to destroy a house) has been reported on a North East Aspect below ridgeline. The crown is on average 50cm deep, roughly 150m wide and ran roughly 500m down the MOUNT. It appears that this slab was wind loaded new snow from earlier in the week and may have been triggered by a cornice faluire. it is unclear if ths avalanche occured naturally or naturally was skier triggered.
Snowpack
What is most concerned about is the instability near the surface layer of snow cover. The newly formed slab on the leeward side, seems to be reacting with moderate loads. The lower layer of snow cover strengthens the bond and is gaining strength. Near-surface instabilities cause the greatest concern at present. Newly wind deposit load on lee slopes appears to be reactive to moderate loads. Below this, the pack is gaining strength and bonding.
Weather
There is a snowfall of 15 cm, and it is forecast that snowfall will continue today. It is said that the westerly winds will subside on the weekend, and the weather will be calm. Up to 15cm of new snow has been recorded overnight with further snowfall forecast during Saturday. We will have light winds from the West over the weekend as a period of settled weather Continues.
