Avalanche Bulletin
更新日時: 2025/02/23 06:30
Myoko
Alpine Low Lack of information due to stormy weather
Treeline Low Lack of information due to stormy weather
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Note the instability that is forming in the upper snowpack. This instability is due to wind and snow from yesterday through this morning. If you find it difficult to assess the situation, please ensure your safety in the terrain by choosing a slope with a gentle angle. When doing so, be careful that there are no large start zones above you. Experienced skiers should consider that "today is a different day from yesterday" and check the snow conditions with fresh eyes. Even if you choose a slope that is less affected by wind, carefully examine its condition, considering the possibility that yesterday's weakly bonding snow may be hidden in the fresh snow. Also, be aware that glide cracks may be hidden by fresh snow at the turn of the slope.
Avalanche Problem
ストームスラブ Storm slab
Consider the possibility that in areas with heavy snowfall up to this morning, that snow may be buried under yesterday's less cohesive snow. Such slopes have the potential to respond to human stimuli, even if the wind effects are small. Use terrain to provide a safety margin, such as choosing a slope with a gentle slope.
概要
Avalanche
Yesterday (22nd), several size 1 dry loose snow avalanches or storm slab avalanches caused by ski cuts were reported in the below treeline.
Snowpack
Snow from previous stormy weather is settling and advancing sintering. Here, yesterday morning, 20-30 cm of uncohesive new snow fell and was responding to human stimulation. Since yesterday afternoon, the snowfall has changed to a strong snowfall accompanied by winds, which are now blowing strongly at higher elevations. Today is a day when we need to be cautious and examine the slab's response to human stimuli.
Weather
The Japan Meteorological Agency is forecasting westerly winds, snow, and a daytime high of 4 °C (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature was -11 °C (as of 5:45 a.m.), with 6 cm of snow having fallen in the past 12 hours and 28 cm in the past 24 hours. At 5:31 a.m. on February 23, the Niigata District Meteorological Office is forecasting 40 cm of snowfall along the mountains of the Joetsu Region in the 24-hour period ending at 6:00 a.m. on February 24.
