山麓-6度降雪なく静穏雪面凍結 モイワ800m-7度データなし降雪なく穏やか アンヌプリ1100m-9.4度西北西5.1m ビレッジ1000m-7.7度北北西4.3m ヒラフ花園1000m-8.9度北4.7m降雪なくおだやか 花園800m-6.2度北北西2.3m 日本海弁慶岬北5m 神威岬北北西4m気圧1017hPa波高1.1m、
低気圧前面で気圧の傾きなく海上、山ともに穏やか。降雪なし。朝の観測とデータ評価から雪崩リスクは低い。雪を求めて立ち入り禁止区域アンベツ、春の滝、湯の沢に入ってはならない。もし見かけたら注意を。またニセコルールの説明を。低気圧の接近に伴い午後から南風が強まり夜半には西寄りの暴風雪となってふきだまりが発達し雪崩リスクが急激に高まる。発生予測は昨日の2月3-4日低気圧降雪層、風成雪スラブの急激な発達はそれ自体の自重増加が原因で弱線破断して雪崩を起こす。降雪推移に注意。ピットチェックを過信してはならない。明日以降しばらくは風下の谷にいてはならない。またスラブ化したふきだまり斜面を滑ってはならない。山は昨日のトラックで荒れているがゲレンデの圧雪は素晴らしく良い。暴走衝突に注意。ロープをくぐってはならない。ビーコンはオンか?
Mountain base -6°C, no snowfall, calm, frozen surface. Moiwa 800m -7°C, no data, no snowfall, calm. Annupuri 1100m -9.4°C, WNW 5.1m/s. Village 1000m -7.7°C, NNW 4.3m/s. Hirafu Hanazono 1000m -8.9°C, N 4.7m/s, no snowfall, calm. Hanazono 800m -6.2°C, NNW 2.3m/s. Sea of Japan Benkei Cape N 5m/s. Kamui Cape NNW 4m/s, 1017hPa, wave height 1.1m.
The pressure gradient is weak ahead of the low-pressure system; both the sea and the mountain weather is calm. No snowfall. Based on morning observations and data evaluation, the avalanche risk is low. Do not enter strictly prohibited areas such as Ambetsu, Haru-no-taki, and Yunosawa in search of snow. If you see someone doing so, please warn them of the risks they’re taking and explain the Niseko Rules. As the low-pressure system approaches, south winds will strengthen from the afternoon, turning into a westerly blizzard by midnight. Wind-carried snowdrift slabs will develop, and the avalanche risk will rise drastically. The predicted trigger layer is the low-pressure snowfall layer from Feb 3-4. The rapid development of wind-packed slabs causes fractures along lines of weakness within the snowpack due to their own increasing weight. Pay close attention to the snowfall transition. Do not over-rely on pit checks. Stay away from leeward gullies, as well as slopes of slabs of wind-affected snowdrifts for some time from tomorrow. The mountain is tracked out from yesterday, but the groomers are in excellent condition. Beware of out-of-control collisions. Do not duck the ropes. Is your beacon on?
出典 Source：気象庁 JMA website (www.jma.go.jp/bosai/weather_map/)