Avalanche Bulletin
更新日時: 2022/01/20 07:00
Niseko Yotei Yoichi Shiribeshi
Alpine Good 非常に急な斜面にて乾いた雪の点発生雪崩の可能性があります。Possible loose dry activity within the latest new snow in very steep terrain.
Treeline Good 雪崩地形での通常の注意事項を考慮してください。標高の低いところでは、グライドクラックに注意してください。Regular terrain travel precautions to be taken. Watch for glide cracks that have opened at lower elevations.
Below Treeline Good 雪崩地形での通常の注意事項を考慮してください。標高の低いところでは、グライドクラックに注意してください。Regular terrain travel precautions to be taken. Watch for glide cracks that have opened at lower elevations.
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
The conditions are perfect for exploring the depths of the backcountry. Few unstable situations have been reported, nor have we found them in our observations. The amount of fresh snow has been low in the past few days, but there are still many places where you can ski comfortably. Continue to follow the behaviours necessary for safe movement and look for good shady conditions. At an altitude of 600 m or less, glide cracks are expanding, so you need to be careful. Conditions are great to explore deeper into the backcountry. Little in the Way of Instability have been reported or found. New snow accumulation has been lower over the last few days but plenty of good turns can still be found. Continue proper safe travel techniques and the best conditions will be found in protected shaded areas. Be wary of glide cracks at lower elevations below 600m that continue to grow and open up creating clear hazards.
Avalanche Problem
ウインドスラブ Wind slab
稜線付近では敏感に反応しないもののウインドスラブが存在しています。スラブの状態を確かめるようにしてください。Unreactive small pockets of soft wind slab have been found around ridgeline. Test areas where slab can be clearly identified.
点発生乾雪雪崩 Dry Loose snow
日陰のとても急な斜面では人の足元をすくう程度のサイズ１の雪崩が発生する可能性があります。そのような場所の下に入らないようにしてください。On shaded slopes the latest new snow may produce up to size 1 loose dry activity in very steep that would be enough to knock a single person off their feet. Manage the consequence of this possibility by not exposing yourself to clear hazards below you.
概要
Avalanche
On January 18, multiple point avalanches of size 1 were observed in extremely steep terrain. On the 18th multiple size 1 (enough to knock you off your feet) loose dry avalanches were observed in extremely steep terrain though ski cuts produced no results.
Snowpack
The snow cover continues to increase in intensity, and few unstable elements are found. On the 19th, snowballs were occurring on the steep slopes due to daytime warming and solar radiation. Fresh 20 cm of snow, which fell a few days ago, remains low density on shady slopes. The snowpack continues to gain strength and little in the way of instabilities can be Found. During the day on the 19th, solar aspects warmed with isolated roller balling occurring in steep terrain. The 20cm of new snow over the previous few days has remained of low density in the shade.
Weather
Currently, Hokkaido is located on the edge of an overhanging high pressure to the west. Therefore, it is a cloudy forecast with weak northerly winds and sunshine. On Friday, snow clouds that form the Sea of Japan make landfall, and there seems to be a lot of snowfall on the north side and not so much on the south side. Currently, Hokkaido sits on the edge of a high-pressure system that stretches far to the West. The result of this is a Northerly flow bringing low winds and broken sunshine on Thursday. Friday May see the snow bands currently running down the coast in the Sea of Japan making Landfall and bringing higher new snow totals in the Northern part of the range while the Southern end will expect less accumulation.
