Avalanche Bulletin
更新日時: 2024/01/25 06:00
Myoko
Alpine Fair
Treeline Fair
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Avalanche danger remains high due to heavy snowfall. Strong cold air is moving in, and snow sintering and stabilization is progressing only slowly. Those entering the forest at lower elevations should carefully consider whether there are any large start zones above them. Also, there are many hazards at lower elevations that are hidden by this new snow, such as glide avalanche debris, glide cracks, and holes in stream bottoms. Always be on the lookout for what may be under the snow. Also, check for "terrain traps" below the slope, where even a small avalanche can have deadly consequences. Please act with a larger safety margin than usual. This is a good day for inexperienced groups to enjoy fresh snow in the ski area. Please stay out of the closed areas and enjoy safe skiing.
Avalanche Problem
ストームスラブ Storm slab
ウインドスラブ Wind slab
We need to consider not only what is forming on the surface, but also the possibility that wind slabs that formed some time ago may be hidden by subsequent snowfall. This situational awareness can be difficult.
点発生乾雪雪崩 Dry Loose snow
On a very steep slope, unaffected by wind.
概要
Avalanche
Yesterday (24th), a size 1 avalanche was observed at the ski area safety control. There is no avalanche report in the mountain area due to low numbers of people entering the mountain.
Snowpack
Snowfall, which began on the evening of the 23rd, has reached 60-80 cm Below Treeline, with more in the northern part of the mountain range. Wind is blowing stronger than yesterday and temperatures remain cold. Below Treeline, bonding between new snow and old snow (Melt-Freeze crusts) was observed to be not too bad yesterday. However, we cannot rest assured that the hard snow surface will be a good bed surface. The bonding condition between new snow and old snow at higher elevations remains highly uncertain.
Weather
A strong winter pressure pattern is continuing today. The Japan Meteorological Agency is forecasting slightly strong westerly winds, snow, and daytime high temperatures of 2 °C (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature is -10 °C (as of 4:45 a.m.), with 15 cm of snow having fallen in the past 12 hours, 35 cm in the past 24 hours, and 77 cm in the past 36 hours.
