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ニセコなだれ情報 第57号 Niseko Avalanche Info No.57

山麓6時-7度12時間降雪10cm、モイワ800m-9.1度西15m/s12時間降雪15cm雪庇ふきだまり発達、見返り分岐北西18m/sふきだまり大きく発達吹雪視界不良、アンヌプリ1120積雪深200cm、1000m-11度北15m/s吹雪視界不良、ヒラフ山頂-12度北寄り18m/s吹雪視界不良、アメダス寿都-2.3度積雪深43cm北西18.5m/s(5時30分)、倶知安-5.1度積雪深156cm西北西19.0m/s(3時12分)、海上弁慶岬北北西19m/s、神威岬西北西12m/s気圧1007hPa波高2.5m、

 

西高東低の気圧配置が強まり山麓も吹雪、標高800m以上風下側に雪庇ふきだまりが急激に発達、試験では1月30日層(こしもざらめ層)から40cmで破断、ふきだまりは更に発達して構造的に不安定な状態が続く。雪崩リスクは高い。各山頂ゲートは閉じられる。ロープをくぐりコース外に出てはならない。

 

面発生表層雪崩は吹雪とその直後に起こりやすい。今日は降雪強度が強いので900m樹林帯南東斜面でも雪崩リスクが高い。チセ、ニトヌプリ方面では注意。森の中は再びリセットされて素晴らしく良い。安全な一日を。

 

Mountain Base 6.00am: -7°, 10cm new snow in the last 12 hrs. Moiwa 800m: -9.1°, W15m/s, 15cm new snow in the last 12hrs, cornice and snowdrift development. Mikaeri Weather Station: NW18m/s, major snowdrift development, blizzard, poor visibility. Annupuri 1120m: snow depth 200cm, 1000m: -11°, N15m/s, blizzard, poor visibility. Hirafu Peak: -12°, Northerly wind 18m/s, blizzard, poor visibility. Kutchan Weather Station: -5.1°, snow depth 156cm, WNW19m/s(3:12am). Suttsu Weather Station: -2.3°, NW18.5m/s(5:30am), snow depth 43cm. Coastal data: Benkei Cape:NNW19m/s. Kamui Cape: WNW12m/s, pressure 1007hPa,wave 2.5m.

 

We have strengthening high pressure west/low pressure east weather system bringing blizzard conditions at all levels including the mountain base. Above 800m snowdrifts are are rapidly developing on leeward slopes. From tests, the Jan 30th granular layer is fracturing at 40cm depth with the structurally unstable growth to continue. All peak gates will be closed. Do not duck ropes to go out of bounds.

 

Surface avalanches easily occur during and right after blizzards. The avalanche risk is High at 900m SE facing slopes (below treeline) with todays heavy snowfall. Be careful Chisei/ Nitto puri. Snow is reset and good in the trees. Have a safe day.

| - | 07:23 | - | - | pookmark |