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ニセコなだれ情報 第87号 Niseko Avalanche Info No.87

山麓6時-2度吹雪降雪20cm、モイワ800m-4.6度西34.7m/s吹雪視界なし、アンヌプリ1150mデータなし積雪増加、ヒラフ山頂-6度風雪強、弁慶岬北西28m/s、神威岬北北西22m/s気圧981hPa波高1.9m、

 

冬型の気圧配置に変わり午前0時から山麓、山、海上ともに猛烈な吹雪、海の波は低いがこれは昨日の南東の嵐の波が強い西風で打ち消されているため。今後海上波高は高まる。モイワ山頂から見返り方面は強風と視界不良で観測不能。そのため見返り連絡救助道の圧雪は行われていない。

 

発達したふきだまりは巨大に成長して少しの刺激で崩壊する。また風下側のふきだまりの堆積は急激で内部不連続面または3月1日低気圧降雪層付近から厚く破断する。全体の雪崩リスクは極めて高い。今日は建物から出ないほうが良い。雪崩の危険は風が10m/s以下に落ちる明日以降も続く。天候が回復してもすぐに山に入らないほうが良い。

 

多くの雪崩事故は吹雪やその直後に起こっている。状況に合わせた柔軟な計画を。温泉に行く時は道路の視界喪失とふきだまり、対向車との衝突に注意。良い一日を。

 

Niseko base 6am: -2℃, stormy, 20cm snowfall. Moiwa800m: -4.6℃, SW34.7m/s, stormy, whiteout. Annupuri1150m: no data, snow accumulating. Hirafu peak: -6℃, strong wind & snowfall. Coastal data: NW28m/s, Kamui cape: NNW22m/s, 981hPa, 1.9m waves.

 

“West High East Low” winter pressure pattern has set in as the low pressure moved east. Heavy storm conditions at the base, peak and the ocean. The wave height in the Sea of Japan is still small, however this is due to the strong SE swells from yesterday’s wind are moving against the current strong westerly wind. The wave height is forecasted to rise today. Snow conditions at Moiwa peak to Mikaeri area were not possible to observe due to heavy storm. The cat track between Moiwa and Annupuri has not been groomed.

 

The developing snowdrifts are growing huge and are extremely unstable. The new snow accumulation in leeward slopes is drastic and uneven and can collapse in thick slabs from yesterday’s low-pressure snowfall layer. Today’s avalanche danger is extremely high. Better stay indoors today. The avalanche hazard will persist through to tomorrow after the wind settles down below 10m/s. Better not rush out to the back country too soon after the storm calms down.

 

Many of the avalanche accidents occur during and just after storms. Be flexible and plan according to the weather. Beware of whiteouts, snowdrifts and oncoming cars on the road to Onsens.

Have a good day.

| - | 07:49 | - | - | pookmark |