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ニセコなだれ情報 第65号 Niseko Avalanche Info No.65

山麓6時-15度12時間降雪10cm弱い吹雪、モイワ800m-18.3度西10.1m/s風雪ふきだまり発達、見返り分岐雪庇ふきだまり発達、アンヌプリ1120m積雪深220cm、ヒラフ山頂-20度風雪ふきだまり発達、水野の沢山麓積雪深165cmノール気温-19.75度12時間降雪10cm西北西13.2m/s、アメダス寿都-12.0度北西9.9m/s積雪深58cm、倶知安-13.8度北西8.9m/s積雪深179cm、弁慶岬北北西18m/s、神威岬北西14m/s気圧1011hPa波高2.8m、

 

強い寒気を伴う冬型の気圧配置の中で標高800m以上風雪強く雪庇ふきだまりが発達、試験では2月8日霜系層から厚さ20-40cmで破断、特にノールでは衝撃の伝播速度が速く面発生雪崩が起こりやすい。雪崩リスクは高い。各ゲート開閉は未定、パトロールの指示に従うこと。森の中はオーバーヘッドの雪。雪崩走路となる谷底を滑ってはならない。

 

雪庇斜面やノールを切ってはならない。雪崩の引き金になる。雪崩は吹雪で急激に発達するスラブ(ふきだまり)が割れて起こる。ラインどりに注意。開けた急斜面は避けた方が良い。ビーコンはオンになっているか?義務ではないがあれば仲間を救えるかもしれない。凍傷に注意。昨日の情報の中に不適切な表現があった。おわびする。良い一日を。

 

Mountain base 6am: -15, 10cm snowfall in 12h, light storm. Moiwa800m: -18.3, W10.1m/s, stormy and snowdrifts developing. Mikaeri junction: cornices and snowdrifts developing. Annupuri1120m snow depth 220cm. Hirafu peak: -20, stormy, snowdrifts developing. 165cm snow depth at Mizuno no sawa base, -19.75, 10cm snowfall in 12h, WNW13.2m/s at the entry knoll of the valley. Suttsu weather station: -12.0, NW9.9m/s, 58cm snow depth, Kutchan -13.8, NW8.9m/s, 179cm snow depth. Benkei cape: NNW18m/s, Kamui cape: NW14m/s, 1011hPa, 2.8m waves.

 

Winter pressure distribution with a strong cold airmass flowing resulted in a cold stormy morning above 800m elevation making cornices and snowdrifts develop considerably. Pressure test showed some weakness activities at feb 8th hoar layer 20-40cm below the surface, most prominent in knoll terrains and surface slab slides are very likely to occur. The overall avalanche hazard level is HIGH. All gates opening are undetermined. Follow the ski patrol’s instructions. The snow in the treeruns is overhead conditions, however be sure to avoid dropping all the way down to the valley bottoms (avalanche paths).

 

Do not cut across cornices and knolls, that’s the easiest way to trigger a slide. Avalanches in Niseko mainly occur as a slab (snowdrifts) that drastically grew during a storm collapses. Beware of your route, better avoid open steep slopes. Have you switched your beacon ON? It is not mandatory to wear one, but it could save yours or your buddy’s life. Beware of frostbites.

We would like to apologize for some inappropriate expressions used in yesterday’s report.

Have a great day.

| - | 07:43 | - | - | pookmark |