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ニセコなだれ情報 第26号 Niseko Avalanche Info No.26

 

山麓6時-3.5度24時間降雪40cm12時間5cm、モイワ800m-6度24時間降雪、風成雪60cm雪庇180cm視界良、見返り分岐ふきだまり発達視界良、アンヌプリ1120m積雪深170cm、ニセコビレッジ1000m-8.61度風弱く晴れ24時間降雪16cm、ヒラフ山頂1250m-7度風弱く視界良、24時間降雪ふきだまり100cm、日本海弁慶岬北9m/s、神威岬東2m/s気圧1027hPa波高3.1m。倶知安アメダス積雪深120cm.

 

等圧線広がり日本海に暖気流入して山は穏やか。昨日の風雪は雪庇ふきだまりを大きく成長させ、標高800m以上のふきだまりは多いところで100cmを越えている。朝の観察から標高800m付近の雪は安定し始めているが場所により80cmで破断、破断面は12/30こしもざらめ層。標高900m南向き斜面、標高1000m大沢雪庇面及び鉱山沢雪庇面の雪崩リスクは引き続き高い。

 

うかつにノールから急斜面に飛び込んではならない。雪庇は大型バス並みに重いので危険。森の中の雪は素晴らしく良いが沢は埋まっていない。穴への転落に注意。パトロールの意見を聞き準備してコース外へ出ること。用心すれば今日も楽しめる。良い一日を。

 

Niseko base 6am: -3.5℃, 40cm snowfall in 24hours, 5cm in the last 12hours. Moiwa800m: -6℃, good visibility, 60cm of wind-affected snow and 180cm cornices have developed in the past 24hours. Notable snowdrifts developments are present in Mikaeri. Visibility is good. 170cm snowdepth at Annupuri1120m. Niseko Village1000m: -8.61℃, light breeze, clear sky, 16cm snowfall in 24hours. Hirafu peak1250m: -7℃, light wind, good visibility, 100cm snowdrifts in 24hours. Coastal data Benkei cape: N9m/s, Kamui cape: E2m/s, 1027hPa, 3.1m waves. Kutchan Weather Station: snow depth 120cm.

 

The isobars are spreading out, warm air is flowing into the sea of Japan and mountain weather is calm. The past storm have left very large development of snowdrifts and cornices, up to 100cm thickness in some places. The snow at 800m elevation is starting to stabilize, however 80cm slab avalanches are still likely to occur. Prominent weak layer is Dec 30th depth hoar layer. The avalanche hazard level is still high in 900m south facing slopes, 1000m O-sawa & Backbowl cornice slopes.

 

Better not drop into steep faces carelessly. Collapsing large cornices’ weight is equivalent to a fully-loaded bus. The snow in the treeruns are amazing, however creeks are yet to be buried. Beware of holes. Listen to the ski patrol’s instructions at the gates and be prepapred for the backcountry. Prudency is key to live and enjoy another day. Have a great day.

| - | 07:46 | - | - | pookmark |