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ニセコなだれ情報 第54号 Niseko Avalanche Info No.54

山麓6時-4.5度降雪なし、モイワ800m-6.2度東1.8m/s降雪なし視界良、見返り分岐ふきだまり発達わずか穏やか、アンヌプリ積雪深200cm、ヒラフ山頂-11度北10-12m/s、アメダス寿都-0.9度積雪深48cm、倶知安-5.9度積雪深151cm降雪なし、弁慶岬南4m/s、神威岬南11m/s気圧1009hPa波高1.4m、

 

低気圧前面で気圧の傾きゆるく海上、山ともにおだやか、標高1200m以上は北風が強まり始めている。降雪はなく積雪は安定しており観察から全体の雪崩リスクは低い。今後低気圧降雪がはじまり天候は急変する見込み。低気圧降雪が20cmを越えると急斜面では流れ型の雪崩が出やすくなるので注意。速度は80km以下と遅いが重く危険。その後冬型の気圧配置が強まればふきだまりが発達して雪崩リスクは更に高まる。各ゲートは朝から開けられる見込み。新雪はなく山は荒れている。滑走注意。ゲレンデ状態はとても良い。最近は明け方の山に登る人が増えている。圧雪車に注意。ヘッドランプの用意を。良い一日を

 

Mountain Base 6.00am: -4.5°, no new snow. Moiwa 800m: -6.2°, E1.8m/s, no new snow, good visibility. Mikaeri Weather Station: minor snow drift development, calm. Annupuri 1120m: snowpack 200cm. Hirafu Peak: -11°, N10-12m/s. Kutchan Weather Station: -5.9°, snow depth 151cm, no new snow. Suttsu Weather Station: -0.9°, snow depth 48cm. Coastal data: Benkei Cape:S4m/s. Kamui Cape: S11m/s, pressure 1009hPa,wave 1.4m.

 

The atmospheric pressure gradient is shallow ahead of a low pressure front. Sea and mountains are calm, but above 1200m a northerly wind has started pick up. There has been no new snow and the snowpack has stabilised. General avalanche risk is low. Expect low pressure snowfall and a sudden change in weather today. Be careful if low pressure snow fall exceeds 20cm , a surface avalanche can easily occur. Although the speed of this type of avalanche is less than 80kmh, it will be heavy and dangerous. Following the low pressure front a strengthening typical winter weather pattern is forecast to develop, causing snowdrift development and increased avalanche risk. All gates are expected to be open. There has been no new snow and the mountain is all tracked out, be careful riding. The groomer's are in good shape. Lately there have been increased numbers of people climbing the mountain at dawn. Be careful of the grooming machines, they cant see you easily, wear a headlamp. Have a good day.

| - | 07:42 | - | - | pookmark |