Avalanche Bulletin
更新日時: 2025/02/14 05:00
Niseko Yotei Yoichi Shiribeshi
Alpine Fair Limited alpine observations reduce our confidence in the alpine hazard rating
Treeline Fair Treeline hazard rating will be moderate in areas that received less snow during the storm.
Below Treeline Good Moderate to strong winds have created windslab even in the BTL elevation band
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Use extra caution around cornices as these have grown rapidly through the storm and may fail unexpectedly with the potential to trigger a larger avalanche below. Windslab will be most hazardous just below ridge crest so enter runs carefully and avoid convexities. Deep snow immersion continues to be a concern so ski with a partner and keep an eye on each other. Tree bombs are also buried in the new snow.
Avalanche Problem
ウインドスラブ Wind slab
Moderate to strong WNW winds have created unstable cornices and windslab on leeward slopes.
ストームスラブ Storm slab
Density inversions and layers within the storm snow may provide a weak layer for the storm slab to run on.
点発生乾雪雪崩 Dry Loose snow
Dry loose avalanches can be expected on steep slopes particularly in the Eastern part of the region that received more overnight snow.
概要
Avalanche
Size 2 cornice triggered avalanche on NE at aspect at 900m in the Kokusai backcountry. Smaller size 1 ski cut and skier accidental windslab avalanches were reported in other parts of the region.
Snowpack
10-15cms of new snow fell across the region during the day yesterday. Overnight brought small amounts to most areas however the Eastern part of the region (Rusutsu area) received 25cms overnight. The storm snow has been re-distributed by moderate to strong WNW winds causing rapid cornice development and windslab formation on leeward slopes even below treeline. A test pit on an East aspect in Kiroro backcountry at 900m produced ECTN results within the storm snow. A deep tap test produced a hard, resistant planar result down 100cms on the Jan. 28 interface. The snowpack is deep and well consolidated below the Jan. 28 layer.
Weather
A strong WNW flow continues through the day today before tapering off this evening. Light snowfall is expected at times during the day with accumulations up to 5cms. Skies will be mostly overcast with the chance of an occasional sunny break. Winds will be moderate gusting to strong WNW all day with valley temps reaching a high of -2C.
