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<< ニセコなだれ情報 第89号 Niseko Avalanche Info No.89 | main | ニセコなだれ情報 第91号 Niseko Avalanche Info No.91 >>
ニセコなだれ情報 第90号 Niseko Avalanche Info No.90

山麓6時-4度降雪なし、モイワ800m-7.8度西4.7m/s、アンヌプリ1150m-11度西5m/s降雪ふきだまりわずか、ヒラフ山頂-13度風弱く降雪わずか、海上保安庁弁慶岬灯台北北西7m/s、神威岬灯台北西7m/s気圧1020hPa波高1.7m、

 

弱い冬型の気圧配置で寒気が入り山は凍結、顕著なふきだまりの発達はないが標高1000m以上では雪庇が崩壊しやすい。観察から全体の雪崩リスクは低い。各山頂ゲートは準備が出来次第開けられる。パトロールの意見を聞きコース外へ出ること。

 

標高900m以下の雪は暖気流入時の降雪が凍結して状態が悪い。ポジションが悪いと前転しやすいので注意。標高1000m以上の雪はマイナス気温が続いたため悪くはないが、発達した雪庇は少しの刺激で大きく崩れる。雪庇から充分距離を取ること。降雪推移から鉱山の沢、アンヌプリ大沢の全層雪崩発生の可能性が高まっている。標高1000m付近で発生するとアンヌプリ水源地近くまで流れるので非常に危険。春のニセコの全層雪崩は氷河雪崩と同じく発生予測が困難。谷底の滑走を避けることが唯一の事故防止の方法となる。

 

山はゆっくりと春に移行している。危険は常にあるが用心すればたいていの事故は防げる。不可抗力の事故はない。良い春山を。

 

Niseko base 6.00am: -4°, no new snow. Moiwa 800m: 7.8°, W4.7m/s. Annupuri 1150m: -11°, W5m/s, trace new snow and snow drift development. Hirafu peak: -13°, light wind, trace new snow. Coastal data: Benkei Cape: NNW7m/s. Kamui Cape: NW7m/s, 1020hPa, wave 1.7m.

 

A weak winter style atmospheric pressure pattern is bring cold air into the region and the mountain has frozen up with no significant snowdrift development. However cornices above 1000m are easily collapsing. From observation the general avalanche risk is low. Peak gates are expected to be open once prepared. Please listen to the patrols advice before going through the gates.

 

Snow conditions below 900m are hazardous, yesterdays warm snowfall has frozen hard. Pay attention, if leaning forward it is easy go over. Conditions above 1000m are not as bad because the temperature remained below freezing, however cornice's can have a major collapse with slight stimulation. Keep well back from the cornice edge. From the snow transition, the risk off full depth avalanche in Kozan no Sawa and Osawa is high. If this happens around 1000m it is very dangerous because they can run as far as the Annupuri water station. Niseko's full depth spring avalanches are like ice falls in that they are difficult to predict. Avoiding riding in the valley bottoms, that is the path they will take. 

 

The mountain is slowly changing to spring. There is always danger in the mountains but most accidents can be avoided by making cautious choices. Have a good day.

| - | 07:41 | - | - | pookmark |