Avalanche Bulletin
更新日時: 2025/03/01 06:00
Myoko
Alpine Fair
Treeline Fair
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
This is a "spring day" with higher temperatures than the day before predicted. Catch the change from frozen slopes in the morning to slopes that thaw, lose strength, and loose snow avalanches during the day. Glide cracks, hidden by previous stormy snow, are beginning to open their mouths again, and their conditions are deteriorating. At lower elevations, be on the lookout for glide avalanches as well. Snow block collapses are possible due to the extreme cliff-like terrain. That snow block can weigh as much as 500 kg in one cubic meter, so even a small one can cause serious injury.
Avalanche Problem
点発生湿雪雪崩 Wet Loose snow
Assessment as of morning. Do not overlook the fact that the upper layer of snow will become wetter and less intense due to the rising temperatures and solar radiation during the day.
全層雪崩 Glide slab
Assessment as of morning. Be alert for glide cracks that are formed by cliff-like or other extreme terrain. Do not stay below cracked slopes.
概要
Avalanche
Yesterday (February 28), numerous size 1 wet loose snow avalanches were observed below treeline. Several glide avalanches of sizes 1.5 were also observed.
Snowpack
Yesterday, the significant temperature increase and strong sunshine wet the snow surface layer in the below treeline, resulting in numerous loose snow avalanches. Today, higher temperatures than yesterday are forecast, so we need to consider that slopes that are frozen in the morning may lose strength during the day. In addition, slopes with glide cracks at lower elevations are at an increased risk of glide avalanches. Since it is difficult to predict when a glide avalanche will occur, the best course of action is to avoid being below it.
Weather
The Japan Meteorological Agency is forecasting southerly winds, northerly winds during the day, clear skies, cloudy in the evening, and a daytime high of 13 °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 24 hours.
