Avalanche Bulletin
更新日時: 2025/02/18 05:00
Niseko Yotei Yoichi Shiribeshi
Alpine Fair A higher degree of concern exists in the north of the region where new snow totals are greater.
Treeline Fair A higher degree of concern exists in the north of the region where new snow totals are greater.
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
With new snowfall forecast to continue across the region today and higher totals forecast for the north, investigation of how this latest new snow is bonding to the previous snow surface is required. At lower elevations and in steep terrain loose dry activity may increase with continued snowfall as it will be falling on a curst from the previous warm temperatures. At higher elevations wind slab on the easterly may be getting buried. This leads to the need to identify what is your primary avalanche concern as you move through the terrain and elevations. Combine this with the likelihood of low visibility as wind speeds increase leading to a cautious approach to the day.
Avalanche Problem
ストームスラブ Storm slab
Overnight in the north of the region we have received up to 20cm of new snow with heavy snowfall set to continue during the day. We expect storm slabs to build as the snowfall continues and cation should be shown as to how this latest new snow bonds to the previous snow surface. The likelihood of avalanche activity will rise as new snow totals increase.
ウインドスラブ Wind slab
Pockets of wind slab on easterly aspects remain reactive to single person loads at higher elevations. Further storm snow and increasing north westerly winds throughout the day will further promote wind slab formation in the alpine and tree line.
概要
Avalanche
On the 17th multiple skier-controlled size 1 avalanches were reported on a north easterly aspects around 900m on convex rolls.
Snowpack
The overnight 20cm of new snow in the north of the region will be falling on a variable snow surface. At lower elevations recent warm temperatures have created a crust up to 900m at varying thickens. The latest new snow may overly previous wind slabs on easterly aspects in the treeline and above. The mid and lower pack appears to be well bond and dormant at present.
Weather
A low pressure system off the east coast as begun wrap around bringing cold air and snow from the north west. We can expect snowfall throughout the day with increased wind speeds possibly gusting to gale at higher elevations in the PM.
