Author: Niseko.Avalanche.Institute

モイワ山麓0度降雪6時間湿雪30cm突風視界不良　見返り800m-3度北5m/s風雪視界不良　花園800m-3度北10.1m　日本海弁慶岬北北東16m　神威岬東北東7m気圧1002hPa波高3.0m、

976hPaの低気圧が南の暖気とともに通過し多量の湿雪降雪20-40cm、気温高く樹林および電線着雪、標高800m以上はマイナス気温で北からの吹雪で南西側に雪庇ふきだまりが急激に発達、雪崩リスクは非常に高い。午後には北から寒気が入り引き続き風雪が続く。今日はスキー場から出ないほうが良い。場内でもコース法面、リフト線下の雪崩に注意。非常に重い湿った雪がコース外の藪や灌木を埋めているが、雪庇下の開けた急斜面を滑るのは危険、賢い滑走ルートの選択を。立ち木衝突に注意。木には勝てない。道路では慎重な運転を。タイヤを過信してはならない。滑り出したら止まらない。屋根からの落雪に注意。外で遊んでいる子供を見たら注意すること。良い一日を。

Moiwa base at 6am: 0℃, gusty winds, 30cm new snow in the last 6hrs, poor visibility. Moiwa Mikaeri 800m: -3℃, N5m/s, wind and snow, poor visibility. Hanazono 800m: -3℃, N10m/s, no new snow in the last 12hrs. Coastal data: Benkei cape NNE16m/s, Kamui cape ENE7m/s, 1002hPa, wave height 3m.

A 976hPa low pressure system passed bringing warm air from the south and 20cm – 40cm of heavy wet snow. Temperatures were high, and snow accumulated in the trees and on power lines. Above 800m, temperatures were below zero. Yesterday snowstorms from the north caused rapid cornice formation on southwest slopes and the avalanche risk was very high. A cold front moved in from the north in the afternoon with continuing the wind and snow. It’s best to stay within the ski resort today. Even within the resort, watch for avalanches on open slopes and below the lift line. Very heavy, wet snow has buried the bushes and shrubs off the runs, however skiing on the open, steep slopes under the cornices is very dangerous. Choose your route carefully. Watch out for crashing into trees, you won’t win that battle. Drive carefully on the road. Don’t rely too much on your tires. Once you start sliding, you won’t be able to stop. Watch out for snow falling from roofs. If you see children playing outside, be careful. Have a nice day.

山麓6時-5度風よわく降雪なし視界良　見返り800m-9度東1.6m降雪なく視界良　花園800m-5.2度南南西4.4m降雪12時間なし　日本海弁慶岬南南東4m　神威岬南南東4m気圧1019hPa波高0.6m、

新たな降雪はなく標高800m以上のウィンドスラブは時間の経過とともに圧密安定、全体の雪崩リスクは低いが標高1000m付近の雪庇は破断しやすいので注意。雪不足で笹が寝ておらず圧雪コース以外は滑走不適、次の嵐に期待。低気圧の接近で午後に低気圧前面降雪が始まりその後風雪が強まる。強い風雪は稜線風下側に雪庇やふきだまりを急成長させ雪崩リスクが上がる、今後の降雪推移に注意。

雪崩事故の多くは吹雪の最中かその直後に起こっている。山に入る時は気象変化によるリスクを想像し、無理のない登山や滑走計画を。ゲレンデからのコース外滑走はまだ出来ない。安易にロープをくぐってはならない。ゲストはスキー場の規則を守らなければならず、またリフトの横入りをしてはならない。国籍に関係なく品位が問われる。怪我のない楽しい日曜日を。

Moiwa base at 6am: -5℃, light winds, no new snow, good visibility. Moiwa Mikaeri 800m: -9℃, E1.6m/s, no new snow. Hanazono 800m: -5.2℃, SSW4.4m/s, no new snow in the last 12hrs. Coastal data: Benkei cape SSE4m/s, Kamui cape SSE4m/s, 1019hPa, wave height 0.6m.

There has been no new snowfall and wind slabs above 800m have consolidated. The overall avalanche risk is low, however be careful as cornices around 1000m are prone to breakage. Due to the lack of snow the bamboo grass has not yet flattened, making only groomed runs suitable for skiing. Lets hope the next storm covers them up. Snowfall is expected to start in the afternoon from the front of an approaching low pressure system. Strong winds and snow will follow, bringing rapid cornice and snowdrift growth on the lee sides of ridges. The avalanche risk will increase. Pay close attention to future snowfall trends.

Most avalanche accidents occur during or immediately after snowstorms. When entering the mountains, please consider the risks of weather changes and plan your climb and skiing accordingly. Skiing off-piste is not yet permitted. Do not thoughtlessly duck under ropes. Guests must follow the ski resort rules and must not cut lift lines. Respect for all is required regardless of nationality. Have a fun, injury-free Sunday.

モイワ山麓-7度12時間降雪20cm風よわく視界良　ヒラフ花園800m-9.8度北北西5.0m降雪20cm　見返り800m-10度北北西1.7m小雪　日本海弁慶岬北西9m　神威岬西8m気圧1025hPa波高2.3m、

等圧線幅ひろがり海上波高、風ともに低下、24時間の標高800m以上の降雪は場所により50cm、各所に雪庇ふきだまりが発達。風雪の落ち着きとともに雪は破砕結晶から結晶雪へと変化し、板が走る。観
測各データの評価から全体の雪崩リスクは低下。標高800m以上の風下40度斜面では場所により破断面厚50cmの面発生表層雪崩の可能性が残る。山岳エリアの稜線落ち込みやガリーでは注意。

スキー場からのコース外滑走はまだ出来ない。ニセコルールに従いパトロールの意見を聞くこと。コース内の怪我が多い。暴走転倒衝突に注意。このスポーツに安全はない。良い一日を。

Moiwa base at 6am: -7℃, light wind, 20cm new snow over last 12 hours,light winds,good visibility. Hanazono 800m: -9.8℃, NNW5.0m/s, 20cm new snow. Moiwa Mikaeri 800m: -10℃, NNW1.7m/s, light snow. Coastal data: Benkei cape NW9m/s, Kamui CapeW8m/s, 1025hPa, 2.3m waves.

The isobar width is widening and ocean wave height and winds are both decreasing. Snowfall above 800m has reached 50cm in some places, with snow cornices forming in some areas. As the wind and snow calm down, the snow will change from broken crystals to crystalline snow, causing snow to slide. Based on observation data, the overall avalanche risk has decreased. On 40-degree leeward slopes above 800m there is still a possibility of surface avalanches with a 50cm fractured surface thickness in some places. Caution is required on ridge drops and gullies in mountainous areas. Skiing out of bounds from within the ski resort is still prohibited.

Follow the Niseko rules and listen to the advice of the ski patrol. There have been many injuries on the slopes. Be careful of reckless riding and falling. There is no safety in this sport. Have a nice day.

山麓6時0度風弱く降雪未明から15cm増加　見返り800m-3度北西0.8m雪視界不良　日本海弁慶岬南3m　神威岬北5m気圧1013hPa波高1.4m　花園800m-6.7度南南西2.3m、

未明から低気圧前面降雪強、日本海から1012hPaの低気圧が西進し午後には南西の風雪が強まる。積雪は増加し、標高800m以上では雪庇ふきだまりが急激に発達の見込み、現在の低気圧降雪は法面リフト線化崖斜面で点発生雪崩を起こしやすい。注意。前線通過前後の積雪の増加は急激、本日午後から明日にかけて雪崩リスクは急激に高まる。

15m/s以上の強い風雪が断続して発達する風成雪スラブは一見硬く安定して見えるが、風が10m以下に落ちて圧密が始まるまでスラブ自体の構造が不安定。雪の層序に関係なくスラブ(風下ふきだまり)の自重増加で雪崩が起こりやすい。ピットチェックを過信してはならない。事故後に原因がわかっても死者は還らない。

今後等圧線幅が狭まり吹雪が続く。このスポーツに安全はない。ここはスキー場なのでルールに従うこと。パトロールは皆さんの安全をいつも心配している。

明日の雪崩情報は休む。良い一日を。車は衝突路外転落に注意。早めのブレーキを。

Mountain base at 6am: 0℃, light wind, 15cm new snow from midnight. Moiwa Mikaeri 800m: -3℃, NW0.8m/s, snowing, poor visibility. Hanazono 800m: -6.7℃, SSW2.3m/s. Coastal weather: Benkei cape S3m/s, Kamui cape N5m/s, 1013hPa, 1.4m waves.

Strong pre-low-pressure snowfall from midnight. A low-pressure system of 1012 hPa is moving westward from the Sea of Japan, with southwesterly winds and snow intensifying this afternoon. Snow accumulation will increase, and snowdrifts are expected to develop rapidly above 800m elevation.

The current low-pressure snowfall is likely to trigger point avalanches on steep course-side cut slopes and cliff bands.  Beware. Snow accumulation will increase rapidly before and after the front passes. Avalanche risk will rise sharply from this afternoon through tomorrow.

Wind-affected snowdrift slabs, developed intermittently by strong winds exceeding 15m/s, may appear hard and stable. However, the slab structure remains unstable until winds drop below 10 m/s and consolidation begins. Avalanches are likely to occur due to the increased weight of the slab (leeward snowdrifts) regardless of the snow stratigraphy. Do not over-rely on pit checks. Even if the cause is understood after an accident, the dead cannot be brought back.

Isobar widths will narrow going forward, with blizzards persisting. There is no safety in this sport. This is a ski resort; follow the rules. Patrols are always concerned for your safety.

Tomorrow’s avalanche report is suspended. Have a good day. When driving, apply brakes early to prevent a collision and running off the road.

出典 Source：気象庁 Japan Meteorological Agency (www.jma.go.jp/bosai/weather_map/)

山麓6時-6度風よわく降雪12時間降雪5cm積雪40cm小雪視界良　モイワ見返り800-8度北西2.0m　花園800m-8.3度北北西3.8m　日本海弁慶岬北西11m　神威岬西北西9m気圧1020hPa波高1.9m

等圧線間隔拡がり海上、山ともに風が落ち始めている。標高800m以上では雪庇ふきだまりがゆっくりと成長、観察各データの評価から雪は安定し全体の雪崩リスクは低い。

雪が少なくスキー場からのコース外滑走はかなり遅れる見込み。ゲレンデの未圧雪部分には新雪が10cm載っており場所により楽しめる。斜面の凹凸に注意。

ロープをくぐりコース外を滑ってはならない。ニセコは滑走者の自由を尊重しその安全のためにニセコルールを運用している。ルールの尊重を。今晩からの雪に期待。良い一日を。

Mountain base at 6am: -6℃, light wind, 5cm snowfall in 12hrs, 40cm accumulated snow, light snow, good visibility. Moiwa Mikaeri 800m: -8℃, NW2.0m/s. Hanazono 800m: -8.3℃, NNW3.8m/s. Coastal weather: Benkei cape NW11m/s, Kamui cape WNW9m/s, 1020hPa, 1.9m waves.

Isobars are widely spaced, and the wind is starting to subside over both sea and mountains. Cornice and snowdrifts are slowly developing on the slopes over 800m elevation. From the data and observations, snow is stabilised, and the overall avalanche risk is low. 

​Due to the limited snowfall, out-of-bounds skiing from ski resorts is expected to be delayed. 10cm of new snow on some off-piste areas in ski resorts can be fun. Beware of the uneven terrain.

Do not duck ropes to ski out of bounds. Niseko respects your freedom to ski out of bounds and runs Niseko Rules for your safety. Please respect the rules. Looking forward to tonight’s snow. Have a good day.

出典 Source：気象庁 Japan Meteorological Agency (www.jma.go.jp/bosai/weather_map/)

山麓-1度西南西2m降雪12時間10cm24時間20cm　モイワ見返り-7度西北西3.8m視界不良　海上弁慶岬北西16m　神威岬西12m気圧1018hPa波高2.1m　花園800m-6.2度北北西6.3m積雪データなし

夜半東北地方地震震度7津波最大40cm　気圧配置冬型

標高800m以上で20m/s以下の風雪、量は少ないが稜線風下側に雪庇ふきだまりが発達、雪は昨日の低気圧降雪20cmとともに雪板化(スラブ化)しており開けた急斜面で浅い面発生雪崩が起こりやすい。

ゲレンデは薄く新雪に覆われているが下部コース以外は滑走不適、今怪我をすればシーズンを棒に振る。気象推移、凍傷に注意、良い一日を。


Mountain base: -1℃, WSW2m/s, 10cm snowfall in the last 12hrs, 20cm in 24hrs. Moiwa Mikaeri 800m: -7℃, WNW3.8m/s, bad visibility. Hanazono 800m: -6.2℃, NNW6.3m/s. Coastal weather: Benkei cape NW16m/s, Kamui cape W12m/s, 1018hPa, 2.1m waves.

Earthquake in Tohoku area at midnight: Intensity 7, Tsunami Peak 40cm. Winter-type pressure pattern.


Snowstorms with winds below 20m/s over 800m elevation. Though snowfall amounts are low, snowdrifts have developed on the leeward side of ridgelines. Snow has formed a slab layer with yesterday’s 20cm of low-pressure snowfall, making shallow surface avalanches likely on open steep slopes.


Ski slopes are covered with a thin layer of fresh snow, but skiing is unsuitable except on lower courses. Getting injured now could ruin your entire season. Monitor weather changes and beware of frostbite. Have a good day.

出典 Source：気象庁 JMA website (www.jma.go.jp/bosai/weather_map/)

山麓6時+2度積雪30cm  モイワ見返り800m-7度南東1.5m降雪視界不良　花園800m-1.4度北3.0m夜半0時北東23m/s突風　日本海弁慶岬北北西5m　神威岬南西7m気圧1012hPa波高1.1m、

未明まで降雪なし、午前6時から低気圧前面降雪、午後には前線通過で山は荒れ模様の見込み。雪は依然少なく圧雪されたコース以外は滑走不能、待つしかない。

寒暖差が大きいため地表付近のシモザラメ化が進んでいる。この層は初冬のニセコに稀に見られ、全層雪崩の原因となる。コース法面や笹地表の急斜面では注意。

事故が最も多い面発生表層雪崩は吹雪など悪天候時に起こりやすい。風雪時に風下側のふきだまり斜面を滑ってはならない。スラブが弱線破断して雪崩を起こす。良い一日を。

Mountain base 6am: +2℃, 30cm snowpack. Moiwa Mikaeri 800m: -7℃, SE1.5m/s, snowing and bad visibility. Hanazono 800m: -1.4℃, N3.0m/s (NE23m/s gusts at midnight). Coastal weather: Benkei cape NNW5m/s, Kamui cape SW7m/s, 1012hPa, 1.1m waves. 

No snowfall until predawn, but started to fall around 6am as the next Low Pressure approaches. The Cold Front will pass in the afternoon and the weather is forecasted to deteriorate. The snowpack remains shallow and the slopes are not suitable for skiing except the groomed runs. Patience is required. 

Depth hoar is developing with the recent large temperature swing. This is quite unusual for early Winter in Niseko and can potentially be a trigger layer for glide avalanches. Caution is required in steep slopes on the course-sides and/or with bamboo-grass. Surface slab avalanches, which are the cause of most accidents, mostly occur during snowstorms or other bad weather conditions. Leeward slopes with heavy snowdrift deposits should be avoided during strong winds and snowfalls. Weak bonding within the newly formed slabs can easily fail and trigger a slide. Have a nice day. 

出典 Source：気象庁 Japan Meteorological Agency (www.jma.go.jp/bosai/weather_map/)

モイワ山麓風よわく+4度降雪なし曇り視程800m以下　日本海弁慶岬西北西8m　神威岬南西16m気圧1012hPa波高1.5m　花園+0度北3.2m濃霧視界不良降雪わずか　見返り800m-3度南南東0.6m降雪わずか濃霧視界不良、

日本海を暖気が北上、標高1000m以下はプラス気温と濃霧、1000m以上は南西の風がやや強い。夜半の弱い降雪が雪面の凹凸部に浅く堆積、観測から雪崩リスクは低いがコース法面、崖斜面では浅い雪崩に注意。光線が弱く斜面の凹凸が見づらい。暴走転倒衝突に注意。今怪我をすればシーズンを棒に振る。ゲレンデは混んでいる。他者への配慮を。雪はそのうちに降る。良い一日を。

Mountain base: light wind, +4℃, no new snowfall, overcast, visibility less than 800m. Coastal weather: Benkei cape WNW8m/s, Kamui cape SW16m/s, 1012hPa, 1.5m waves. Hanazono: 0℃, N3.2m/s, thick fog, poor visibility and light dusting. Mikaeri 800m: -3℃, SSE0.6m/s, light dusting, thick fog and bad visibility.

Warm air is flowing north from the Sea of Japan. The temperature is above freezing up to 1000m elevation. Thick fog is lying up high. Moderate SW wind is blowing above 1000m. A little bit of snow fell overnight and shallowly filled in the gap of the surface. Avalanche risk is low, however still to be considered on the steep course-side cut slopes and cliffbands. The light is weak and the terrain undulations are hard to see. Beware of overspeeding, falls and collisions. One injury now can ruin your season. The slopes are crowded, please mind of others. The snow will eventually come. Have a nice day.

出典：気象庁HP (www.jma.go.jp/bosai/weather_map/)

山麓+2度降雪なく曇り積雪30cm　海上弁慶岬西北西14m　神威岬南西17m ニセコ花園1000m南南東12.3m気温-3.6度　12月6日層を記録。

上空の風は強いが雪は期待したほど入っていない。次の低気圧待ち。標高1000m以上は風が強く場所により雪庇ふきだまりが発達、

雪庇は崩壊しやすく稜線直下では40cm以下の浅い面発生表層雪崩が起こりやすい。　

ゲレンデの地形変化に注意、光がなく凹凸が見えづらい。暴走衝突に注意。今怪我をすればシーズンを棒に振る。良い一日を。

Mountain base +2℃, cloudy with no new snowfall, snowpack 30cm. Coastal weather: Benkei cape WNW14m/s, Kamui cape SW17m/s. Niseko Hanazono 1000m: SSE12.3m/s, -3.6℃. Dec 6th layer recorded. 

The upper sky wind is blowing strong, however it hasn’t brought much snow as anticipated. We’ll have to wait for the next Low-pressure to come. The wind speed remains high above 1000m elevation, developing cornices and snowdrifts in some areas. These cornices are highly likely to break. Surface slab avalanches of up to 40cm thickness are to be expected in leeward slopes just under ridgelines. 

Beware of the groomers’ terrain undulation. The light is flat and the unevenness is hard to see. Be careful not to overspeed and crash. One injury now can ruin your whole season. Have a nice day.

山麓6時 -7度 降雪12時間20cm 北西5m 弱い風雪。日本海弁慶岬北北西17m神威岬西南西14m1005hPa波高1.8m。

西高東低冬型の気圧配置で寒気流入、標高800m以上は10m/sを越える西寄りの吹雪、雪庇ふきだまりが発達、標高900m以上の南斜面では、解けずに残った地表上の15cｍがシモザラメ化している。笹の30度斜面では急激な積雪増で雪崩れやすくなるので注意。真冬でも全層雪崩は起こる。雪はまだ足りない。今無理をすればシーズンを棒にふる。知識技術を過信せず常に用心を。

全ての観測測器が稼働するまでしばらくかかる。情報は不定期に出される。良いシーズンを。

Mountain base 6am: -7℃, 12h snowfall 20cm, NW5m/s, light snow and wind. Coastal data: Benkei cape NNW17m/s, Kamui cape WSW14m/s, 1005hPa, 1.8m waves. 

Wintery pressure distribution with a Low in the East and High in the West is making cold air flowing into Japan. Stormy weather with Northwesterly 10+m/s wind above 800m elevation. Snowdrifts are developing rapidly. The old snow that persisted in south facing slopes above 900m are forming a 15cm layer of granular snow (depth hoar) on top of the ground. Avalanches are likely to occur in 30degree slopes with bamboo-grass with the rapid growth of new snowpack. Glide avalanches can occur even in the heart of Winter. 

The snowpack is still very shallow, don’t push it too hard and waste your season. Stay vigilant and do not overestimate your knowledge and skill. 

It will take some more time to have all our observation instruments running. The report will be issued irregularly for some time. Have a great season.