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<< ニセコなだれ情報 第74号 Niseko Avalanche Info No.74 | main | ニセコなだれ情報 第76号 Niseko Avalanche Info No.76 >>
ニセコなだれ情報 第75号 Niseko Avalanche Info No.75

山麓6時-8度降雪15cm、モイワ800m5時16m/s6時10m/s-10.8度北からのふきだまり大きく発達、アンヌプリ1150m-13度北北西15m/sふきだまりで圧雪困難、ヒラフ1250m-13度北の突風強く降雪20cmふきだまり発達、日本海弁慶岬北14m/s、神威岬北北東10m/s気圧1011hPa波高2.6m、

 

冬型の気圧配置が強まり夜半から未明まで北の風強く吹雪、風は落ち始めてきたがふきだまりが大きく発達している。標高800m風下斜面上部のふきだまりは12時間で80cmに達し不安定。午前中見返りボウル、アンヌプリ大沢、鉱山の沢、東尾根奥の雪崩リスクは高い。発生予測は2月17-18日低気圧降雪層。

 

各ゲートの開閉は未定。パトロールの判断に従うこと。風下斜面樹林帯は程よくリセットされている。ふきだまりとふきさらしが交互にあるので滑走注意。事故は吹雪やその直後に起こりやすい。同時滑走をしないこと。雪庇やノールを刺激しないこと。沢底にとどまらないこと。雪崩は上から来る。亀裂転落に注意。

 

ヘルメット、ビーコンの着用を勧める。ビーコンは義務ではないが持っていれば自分だけではなく誰かを救えるかもしれない。良い一日を。

 

Niseko base 6am: -8℃, 15cm snowfall. Moiwa800m: northerly 16m/s at 5am, 10m/s at 6am, -10.8℃, large development of snwodrifts. Annupuri1150m: -13℃, NNW15m/s, difficult to groom due to large amount of snowdrifts. Hirafu1250m: -13℃, strong northerly gusts, 20cm snowfall with snowdrift development. Coastal data: Benkei cape N14m/s, Kamui cape NE10m/s, 1011hPa, 2.6m waves.

 

The winter pressure distribution has set in place, generating a strong northerly storm from last night to pre-dawn. The wind is settling down, however snowdrifts have developed drastically. Those new deposit of snow have reached 80cm in 12 hours in upper leeward slopes above 800m. The avalanche risk is high during the morning in Makeri bowl, Back bowl, Annupuri bowl and Higash-One. Potential trigger layer is Feb 17-18th low pressure snowfall.

 

Gates opening is unconfirmed; please respect the patrol’s decisions. The treeruns in leeward aspects are mostly reset, however better watch out as there are wind-blown spots and wind-loaded spots are mixed up. Accidents mostly occur during and just after storms. Ride one by one. Do not stimulate cornices and knolls. Do not stay put at the bottom of the valley as avalanches strike from above. Beware of cracks.

 

Helmets and beacons are not mandatory, however are highly recommended. Beacons may save not only your life but your buddy’s too. Have a nice day.

| - | 07:42 | - | - | pookmark |