Avalanche Bulletin
更新日時: 2025/01/11 05:30
Hakuba
Alpine Low
Treeline Low
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
The strong snowfall is over, but dangerous avalanche conditions continue. Careful assessment of terrain and conservative route planning is required. Even if the weather improves, start your day by exploring small slopes for snowpack conditions. Look around the surrounding terrain for signs of wind. Once you see wind slab formation, move to terrain with a slower slope and no large steep slopes at the top. It is important to maintain good communication with your companions and continue with your principled course of action. There are many places where glide cracks are hidden by fresh snow. Be vigilant at the convex slope.
Avalanche Problem
ウインドスラブ Wind slab
Observe the snow surface carefully and look for signs that the wind has blown. Also, as you walk, feel the change in the texture of the snow on the surface layer of the snowpack. If the soft snow changes to a hard feeling, a wind slab may be forming there. Avoid terrain that is convex or unsupported, which can easily trigger an avalanche.
ストームスラブ Storm slab
Low temperatures continue to prevail. Consider that stormy weather instability is still present on steep slopes except at lower elevations or in areas exposed to very strong winds.
概要
Avalanche
Yesterday (10th), a size 1.5 wind slab avalanche was observed on the southeast slope at 1,100 m elevation. This avalanche is a natural occurrence. A size 1 loose snow avalanche was also reported, stimulated by dropped cornice. No observations were reported for treeline and alpine due to stormy weather.
Snowpack
Snow height due to the stormy weather that began on January 6 amounted to about 130 cm in the upper part of the below treeline. Below treeline, yesterday's solar radiation and rising temperatures have promoted rapid settling. Meanwhile, the treeline and alpine areas continue to be exposed to very strong northwest-north winds.
Weather
The Japan Meteorological Agency is forecasting northerly winds, sunny, occasionally cloudy, snowy in places until late afternoon, and a daytime high of 3 °C (418 m elevation) for northern Nagano Prefecture. At 703 m elevation Hakuba, the temperature is -8.4 °C (as of 5:00 a.m.), with no new snowfall in the past 12 hours.
