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ニセコなだれ情報 第70号 Niseko Avalanche Info No.70

山麓6時-10度24時間降雪15cm、モイワ800m-13.1度北西4.3m雪庇ふきだまり発達、見返り分岐-13度ふきだまり発達、アンヌプリ1120m積雪深250cm、水野の沢12時間降雪6cm24時間降雪8cm、ヒラフ山頂-16度夜半15m/sふきだまり発達、アメダス寿都-6.1度午前0時北西14.5m/s、倶知安-8.6度積雪深194cm、弁慶岬灯台北西9m/s、神威岬北北西8m/s気圧1022hPa波高1.4m。

 

天候が変わりやすく標高800m以上では10-15m/sの風雪により雪庇とふきだまりをゆっくりと発達させている。試験から顕著な雪崩リスクはないが標高1000m風下急斜面ではふきだまり内部不連続面(弱線)が原因する破断面40cm程度の面発生表層雪崩が起こる可能性が続く。各山頂ゲートは開けられる予定。パトロールの意見を聞き準備してコース外へ出ること。

 

ビーコンやエアバッグは飾りではない。必要な時に使えなければただのお荷物になる。いまどきの雪庇は崩壊しやすい。飛ぶのは楽しいが注意。一生を棒に振ってはならない。山の中にむやみにキッカーを作ってはならない。誰かが怪我をする。満足したら必ず壊すこと。

雪は今日も素晴らしく良い。

 

Mountain base 6am: -10, 15cm snowfall in 24h. Moiwa800m: -13.1, NW4.3m/s, cornice and snowdrifts developments. Mikaeri junction: -13, developing snowdrifts. Annupuri1120m snow depth 250cm. Mizuno no Sawa: 6cm snowfall in 12h, 8cm in 24h. Hirafu peak: -16, wind peaking at 15m/s late night, snowdrifts developed. Suttsu weather station: -6.1, NW14.5m/s at midnight. Kutchan: -8.6, 194cm snow depth. Benkei cape light house: NW9m/s, Kamui cape: NNW8m/s, 1022hPa, 1.4m waves.

 

The weather is changing quickly and a 10-15m/s storm is making cornices and snowdrifts develop slowly above 800m elevation. According to pressure tests, the overall avalanche risk seems relatively low, however 40cm thick surface slab avalanches caused by snowdrifts’ uneven bonding are still likely to occur in 1000m leeward steep slopes. All gates are scheduled to open, however make sure to be well prepared for the backcountry and seek for advice from the patrols before stepping out of the gates.

 

Avy beacons and airbags are not decorations. It makes no sense to carry them if you’re not familiar with how to use them. Cornices are highly likely to fall around this time of the season. Cornice drops may be fun, but is not worth risking your life. Building kickers wherever without being aware of the consequences is nonsense. If you do build one, make sure to flatten it before you leave. Somebody could get hurt.

The snow condition is wonderful again today. Have a good one.

| - | 07:38 | - | - | pookmark |