Avalanche Bulletin
更新日時: 2025/03/11 05:30
Hakuba
Alpine Fair
Treeline Fair
Below Treeline Good Note the degree of temperature rise and solar radiation during the day
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Generally safe avalanche conditions. An avalanche danger rating of "1 low" does not mean that avalanches will not occur. Also, the JAN avalanche bulletin is not a "forecast" but a "current status" as of the morning. In Alpine and Treeline, watch for unstable slabs remaining in extreme terrain pockets. Below treeline, watch for wet loose snow avalanches on slopes affected by rising daytime temperatures and sunny slopes. Wet snow is very heavy and can easily topple people. Also, stay away from slopes with glide cracks. When passing under them, please move quickly and keep a good distance from your companions. Spring is approaching.
Avalanche Problem
全層雪崩 Glide slab
At lower elevation treeline. Stay away from slopes that already have glide cracks in them. Also, be alert for collapsing snow blocks in cliff-like terrain.
点発生湿雪雪崩 Wet Loose snow
Assessment as of morning. Note snow changes during the day.
概要
Avalanche
Yesterday (10th), a number of snowballs and size 1 loose snow avalanches of size 1 wet avalanches were observed below treeline.
Snowpack
Yesterday was sunny and the temperature rose significantly (703 m elevation, 16:00, 9.7 °C). Winds near the main ridge also weakened in the morning, making conditions more conducive to the snow surface and to the effects of solar radiation and temperatures. This also helped to resolve the snow instability of previous stormy weather. Weaker nighttime cooling and warmer air coming in from the south will increase the risk of glide avalanches at lower elevations.
Weather
The Japan Meteorological Agency is forecasting southerly winds, cloudy skies, rain or snow in places before noon and in the evening, and daytime high temperatures of 11 °C (418 m elevation) for northern Nagano Prefecture. At Amedas Hakuba (elevation 703 m), the temperature is -0.9 °C (as of 5:00 a.m.), with no new snowfall in the past 12 hours. At the main ridge (elevation 2,400 m), the temperature is -5 °C (as of 5:00), with northerly winds averaging 5 m/s and a maximum instantaneous wind speed of about 8 m/s.
