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ニセコなだれ情報第51号 Niseko Avalanche Info No.51
 
山麓6時気温-5度降雪12時間15cm破砕結晶、モイワ800m北東18m/s-7度降雪ふきだまり50cm、アンヌプリ1000m北15m/s-10度ふきだまり50cm総積雪275cm、ヒラフ1000m北東風つよく-8度ふきだまり発達、山頂風速6時:北北西19.2m/s、弁慶岬灯台北東14m/s神威岬東北東6m/s気圧1014hPa波高2.1m、
北東風強く各所にふきだまりが発達、1月31日層から破断しやすい。大沢雪庇面、見返りボウルなどに短時間で作られたハードスラブの斜面、雪庇斜面では雪崩リスクが高い。今後風向きが北から西に変わりふきだまりの発達が続く。注意。各山頂ゲートは閉じられる予定。
ひさしぶりにまとまった雪が降ったが、今日は森の中とコース脇のパウダーで我慢したほうが良い。雪は浅いが悪くはない。多くの雪崩事故は風雪時の風下斜面で起こっている。光線がなく斜面の凹凸が見えない。慎重な滑走を。
 
Niseko base 6am: -5, 15cm of crushed crystal snowfall in 12 hours. Moiwa 800m: NE18m/s, -7, 50cm of snowdrifts. Annupuri 1000m: N15m/s, -10, 50cm of snowdrift, 275cm snowpack. Hirafu 1000m: strong NE wind, -8, developing snowdrifts. Peak anemometer: NNW19.2m/s at 6am. Coastal data: Benkei cape E14m/s, Kamui cape ENE6m/s, 1-14hPa, 2.1m waves.
Strong NE wind generated large development of unstable snowdrifts, easily sliding from Jan 31st layer. Hard-slabs and cornices in Osawa ad Mikaeri bowl that formed in a short period of time are very unstable. Avalanche risk is high in those slopes today. The wind will shift to north, then to westerly and snowdrifts will develop accordingly. Beware. Peak gates scheduled to be kept closed.
A decent dump has finally come, however it’s better to stay in the trees and course-side powder areas for now. The new snow is a bit shallow but pretty good. Many of the avalanche accidents occur in leeward slopes during a storm. Sunlight is weak and the surface is hard to see. Stay in control, be prudent and ride safe.
| - | 07:29 | - | - | pookmark |
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