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ニセコなだれ情報 第47号 Niseko Avalanche Info No.47

山麓6-1012時間降雪35cm、モイワ800m-11.8度西11.3m/s雪庇ふきだまり発達吹雪視界不良、見返り分岐視界不良、アンヌプリ1120m積雪深190cm、ヒラフ山頂-16度吹雪視界不良、水野の沢-13.5度北西の風雪強くふきだまり発達、倶知安アメダス-7.6度積雪深146cm、弁慶岬北西18m/s、神威岬西北西16m/s気圧1001hPa波高4.5m

 

等圧線の幅狭まり吹雪、雪の量は多く山麓でもふきだまりが発達視界不良、標高800mの観察から新たなふきだまりは12時間で100cmを越え雪庇は大きく成長。標高800m以上風下側雪庇斜面、ノールでは120日低気圧降雪層から破断面60cm以上の面発生表層雪崩が起こる可能性がある。1/20層は温度勾配による霜系の層。各データの推移、観察から雪崩リスクは高い。

 

各山頂ゲートは閉じられる見込み。パトロールの指示に従うこと。今日はコース脇で我慢したほうが良い。風が落ちリフトが回り出しても雪崩の危険は続く。ロープをくぐり大沢や立ち入り禁止区域湯の沢、春の滝に入ってはならない。森の中の雪は良いが深い。転倒窒息に注意。明日には再びコース外を滑れる。良い一日を。

 

Mountain Base 6.00am: -10°, 35cm new snow in last 12hrs. Moiwa 800m: -11.8°, W11.3m/s, cornice and snowdrift development, blizzard, poor visibility. Mikaeri Weather Station: poor visibility. Annupuri 1120m: snow depth 190cm. Hirafu Peak: -16°, blizzard, poor visibility. Mizuno no Sawa: -13.5°, strong NW snow wind, snowdrift development. Kutchan Weather Station: -7.6°, snow depth 146cm. Coastal data: Benkei Cape: NW18m/s. Kamui Cape: WNW16m/s, 1001hPa, wave 4.5m.

 

Isobars have moved closer together bringing blizzard conditions and heavy snowfall. Snowdrifts have formed even at the mountain base, visibility is bad. From observation at 800m, there has been over 100cm snowdrift growth and major cornice development in the last 12 hrs. There is possibility of surface avalanche on leeward cornice slopes and knolls around 800m, fracturing at over 60cm depth on the Jan 20th layer of pre low pressure snowfall. Jan 20th layer has formed frost layer by temperature gradient. From all data avalanche risk is high.

 

All peak gates are expected to be closed. Please follow the patrols instructions. Be patient and only ride the sides of the runs today. Even if the wind drops and upper lifts start running the avalanche danger will continue. Do not duck ropes, never enter Yuno Sawa or Haru no taki. Snow is deep and good in the trees. Be careful hitting trees and getting stuck. Maybe tomorrow we can ride the good stuff again. Have a good day.

| - | 08:01 | - | - | pookmark |