Avalanche Bulletin
更新日時: 2025/03/11 05:00
Niseko Yotei Yoichi Shiribeshi
Alpine Good
Treeline Good
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
With warmer days at present a mindset shift may be required to focus on conditions at lower elevations. An overnight surface freeze is likely to rapidly decompose early in the day below treeline and wet loose activity to begin. Be wary of terrain traps below you as wet loose avalanches can be heavy and stay in the fall line of a slope. At higher elevations, pockets of wind slab have been observed on eastly aspects and remain a concern.
Avalanche Problem
点発生湿雪雪崩 Wet Loose snow
With freezing levels pushing as high as 1000 metres today we expect any overnight surface freeze to break down quickly and the possibility of wet loose activity from early in the day. Look for signs of roller balling in steep solar terrain and be conscious that hazards may exist at lower elevations.
全層雪崩 Glide slab
With warm temperatures and the possibility of free water moving in the snow pack avoid traveling in terrain below glide cracks today due to their high consequence in failure.
ウインドスラブ Wind slab
Previous strong westerly winds have created pockets of wind slab on lee slopes in the alpine. Look for sighs of fresh wind load in protected area near ridgeline.
概要
Avalanche
Numerous size 1 wet loose avalanches have been reported yesterday on all aspects at lower elevations.
Snowpack
With the air temperature jumping to above freezing at the start of the week, the upper snowpack became wet and heavy on all aspects below 800m and on southerly aspect into the alpine. An overnight freeze will likely to have formed a crust on these previously warmed surfaces. We can expect this crust to break down quickly in the heat of the day today. At upper elevations, winds from the west have transported snow onto lee slopes creating pocket of slab in protected areas. The mid and lower pack are well settled and consolidated.
Weather
We remain in a south westerly air flow which will raise the freezing level to 1000m. Broken sunshine and light to moderate winds are expected throughout Tuesday at mid elevations.
