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ニセコなだれ情報 第92号 Niseko Avalanche Info No.92

山麓6時-8度降雪10cm、モイワ800m-11.7度西南西5.4m/s降雪15cmふきだまり発達、アンヌプリ1150m-15度北西15m/s降雪15cm、ヒラフ山頂-15度西15m/s降雪15cm、日本海弁慶岬北西12m/s、神威岬西北西7m/s気圧1034hPa波高2.0m、

 

強い寒気を伴う高気圧の縁で未明まで15m/s前後の弱い風雪が断続、ふきだまりが風下にゆっくりと堆積。試験から標高800m付近では顕著な破断はなく標高1000m以下の雪崩リスクは低い。標高1000m以上では風雪が強く新たなふきだまり(ソフトスラブ)は滑走刺激で3月5日層から雪崩れやすいので注意。標高差の大きな開けた急斜面では雪崩リスクがやや高い。

 

リフト運行によるが各山頂ゲートは開けられる見込み。パトロールの意見を聞き準備してコース外へ出ること。樹林帯の雪は底あたりするがこの時期にしては素晴らしく良い。西尾根上部鉱山の沢側とアンヌプリ大沢標高1100m付近では全層雪崩が起こる可能性が高まっている。全層雪崩は暖かな日に起こるとは限らない。また亀裂の有無だけが判断材料ではない。事故を防ぐため谷底を避けて滑走すること。山は寒暖を繰り返して春に向かっている。今日は寒い。良い一日を。

 

Niseko base 6am: -8℃, 10cm snowfall. Moiwa800m: -11.7℃, WSW5.4m/s, 15cm snowfall wit hsnowdrifts development. Annupuri1150m: -15℃, NW15m/s, 15cm snowfall. Hirafu peak: -15℃, W15m/s, 15cm snowfall. Benkei cape: NW12m/s, Kamui cape WNW7m/s, 1043hPa, 2.0m waves.

 

A strong cold airflow is brought on the edge of the high-pressure system. Intermittent snowfall with 15m/s wind is persisting through the morning. Snowdrifts are slowly growing in leeward slopes. There were no notable instability observed in the snowpack around 800m elevation. The avalanche risk below treeline is low. The wind stayed relatively strong in higher elevation and the new snowdrifts (soft slabs) could easily slide from March 5th layer. Avalanche hazard is relatively high in long and wide open steep slopes.

 

Peak gates are expected to open depending on the peak chair operation. Listen to the patrol’s instructions, be well prepared and step out from the gates. The new snow in the trees is a bit shallow, but very good for this time of the season. Glide avalanche (full depth slides) hazard is rising in upper west-ridge’s Backbowl side and Annupuri O-sawa 1100m. Glide avalanche does not necessarily occur in warm temperature and visible cracks are not the only signs to evaluate the risks. It is strongly recommended not to ride the valley bottoms in order to avoid being caught in case it slides. Thaw & freeze, the mountain is slowly shifting to Spring. Today’s still like winter. Enjoy your day.

| - | 07:48 | - | - | pookmark |