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<< ニセコなだれ情報 第64号 Niseko Avalanche Info No.64 | main | ニセコなだれ情報 第66号 Niseko Avalanche Info No.66 >>
ニセコなだれ情報 第65号 Niseko Avalanche Info No.65

山麓6時-6度降雪10cm静穏、モイワ800m-9度西北西3.6m/s降雪15cm夜半から未明にかけてふきだまり発達、アンヌプリ1150m-9度西7m/s降雪10cm標高1000m総積雪330cm、ヒラフ1250m-11度未明北寄りの風雪降雪5cm、弁慶岬北西13m/s、神威岬西南西13m/s気圧1011hPa波高1.2m、

 

日本海では15m/s以下の弱い風雪が続いているが等圧線の幅が広がり始め標高1000m以下の吹雪は弱まっている。夜半から未明にかけて北寄りの吹雪により雪庇、ふきだまりが発達、標高800m以上のノール、雪庇斜面では朝のうち表層雪崩が起こりやすい。発生面は2月5-7日低気圧降雪層。新たなふきだまりのスラブ化の程度は小さいが充分に危険。各ゲートは開けられる。パトロールの意見を聞き準備してコース外に出ること。

 

森の中には良い雪が入っており昨日より滑りやすい。雪庇、ノールを避けて滑ること。見返りボウルの亀裂が広がっている。今冬は雪の量が多く南に面した急斜面には亀裂がたくさん生じている。亀裂は斜面緊張の解放で起こる。すぐに雪崩れるわけではないが多雪のため場所により全層雪崩に発展する恐れがある。亀裂下にしわや起伏がない斜面では注意。谷底にとどまってはならない。雪崩は上から来る。

 

山に安全はないが用心すればたいていの事故は防げる。天候急変、亀裂転落に注意。亀裂は滑っている時には見えず突然現れる。良い一日を。

 

Niseko base 6am: -6℃,10cm snowfall, calm. Moiwa800m: -9℃, WNW3.6m/s, 15cm snowfall, snowdrifts developed at night until dawn. Annupuri1150m: -9℃, W7m/s, 10cm snowfall, 330cm snowpack at 1000m. Hirafu1250m: -11℃, northerly wind & snow before dawn with 5cm snowfall. Coastal data: Benkei cape NW13m/s, Kamui cape WSW13m/s, 1011hPa, 1.2m waves.

 

A light storm under 15m/s has persisted over the Sea of Japan, however the isobars are spreading out and the wind is starting to calm down in lower elevations. A northerly wind has picked up overnight and made cornices and snowdrifts develop. Surface slab avalanches are to be expected during the morning at knolls and around cornices above 800m elevation. Potential sliding layer is Feb 5-7th’ low pressure snowfall. The new snowdrifts are yet to form notable slabs, however are dangerous enough. All gates are expected to open. Please seek the patrol’s advice and be well prepared before stepping out of the gate.

 

The snow in the trees is fairly good, probably a little better than yesterday’s. Avoid cornices and knolls. Cracks in the Mikaeri bowl area are growing. Glide cracks are forming due to heavy amount of snow, predominantly in south facing aspects. These cracks are forming as the slope is releasing its own tension. They most probably won’t slide right away, however chances of glide avalanches are to be expected. Stay away from slopes without wrinkles under cracks. Do not stay put at the bottom of the valleys. Avalanches strike from above.

 

There is no 100% safety in the mountains, however most risks can be avoided by making conservative decisions. Beware of sudden weather change and falling in cracks, they are difficult to notice from above. Have a nice day.

 

| - | 07:53 | - | - | pookmark |