Avalanche Bulletin
更新日時: 2025/03/13 06:30
Myoko
Alpine Fair
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 1-2 glide avalanches were observed below treeline. All of them originated from cliff-like terrain. In addition, several size 1-1.5 wet loose snow avalanches were reported on steep slopes exposed to strong solar radiation. These avalanches were either naturally occurring or caused by ski cuts.
Snowpack
The snowpack is in a "spring cycle" of repeated Melt and Freeze. Yesterday, temperatures rose to nearly 10°C at around 1,000 m elevation. This caused the snow cover surface layer to become thicker and wetter, leading to numerous wet snow avalanches. The nighttime cold was also weak, and the same temperature increase is forecast for today as yesterday. Slopes with glide cracks should be considered unstable.
Weather
The Japan Meteorological Agency is forecasting westerly winds, cloudy, occasionally sunny, and partly rainy with a daytime high of 14 °C (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature is 2 °C (as of 4:45 a.m.), with no new snowfall in the past 12 hours.
