Avalanche Bulletin
更新日時: 2025/03/13 05:30
Hakuba
Alpine Low Unknown extent of yesterday's rainfall.
Treeline Fair
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
At higher elevations, watch for slips and falls on hard snow. At lower elevations, be alert for avalanches caused by wet snow due to high temperatures. Stay clear of slopes with glide cracks, as the danger of glide avalanches is rising. When passing under them, please move quickly and keep a good distance from your companions. In addition, snow blocks left on cliff-like terrain are unstable. Look up when resting or stopping to see if there are any such hazards above you. Some ski areas also have course restrictions against glide avalanches. Pay attention to the ropes and signs and try to abide by them.
Avalanche Problem
全層雪崩 Glide slab
With continued high temperatures and a large amount of meltwater yesterday, slopes with glide cracks should be considered unstable. Be on the lookout for collapsing snow blocks on cliff-like terrain.
点発生湿雪雪崩 Wet Loose snow
The thickness of the wet snow surface layer combined with terrain factors can increase the magnitude of even a loose snow avalanche. Below treeline, be wary of steep, south-facing gully terrain.
概要
Avalanche
Yesterday (12th), several size 1 loose snow avalanches were reported below treeline.
Snowpack
The snowpack is in a "spring cycle" of melting and freezing. Yesterday, temperatures were positive up to Alpine, with some rainfall in the afternoon. With a weak temperature drop during the night, the intensity of the snowpack is likely to decrease in the early morning hours at lower elevations.
Weather
The Japan Meteorological Agency is forecasting northerly winds, partly cloudy, with a daytime high of 15 °C (418 m elevation) for northern Nagano Prefecture. At AMeDAS Hakuba (elevation 703 m), the temperature is 1.6 °C (as of 5:00 a.m.), with 1.5 mm of precipitation in the past 24 hours. At the main ridge (elevation 2,400 m), the temperature is -1.3 °C (as of 5:00), with northerly winds averaging 8 m/s and a maximum instantaneous wind speed of about 14 m/s.
