Avalanche Bulletin
更新日時: 2025/03/23 06:30
Myoko
Alpine Fair
Treeline Fair Depends on the degree of temperature rise and solar radiation
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
As with yesterday, this is a day to be on the lookout for wind slabs in alpine areas and wet loose snow avalanches or glide avalanches below treeline. At lower elevations, one should take into account the continued high temperatures and the large amount of meltwater throughout the night. Avoid slopes with glide cracks, and do not stay under them. Always be mindful of the slope above you when descending the valley line later in the ski tour. Snow blocks left on cliff-like terrain are extremely unstable.
Avalanche Problem
ウインドスラブ Wind slab
Continuously very strong westerly winds are blowing.
全層雪崩 Glide slab
Snow blocks remaining on extreme terrain are unstable. Do not stay under slopes with glide cracks.
点発生湿雪雪崩 Wet Loose snow
The rating is as of the morning. At very low elevations, the surface snow is thickening and losing strength. Be aware of very steep gully terrain, even in the forest.
概要
Avalanche
Yesterday (22nd), several size 1.5-2 glide avalanches were observed in the extreme terrain below treeline. In addition, numerous size 1 wet loose snow avalanches were reported.
Snowpack
Continuous and very strong winds in the alpine areas are causing the snow surface to scrape and redistribute snow. On the other hand, at elevations not affected by the wind, the snow is in perfect spring conditions due to high temperatures and solar radiation. On the steep southern slopes, the upper layer of snowpack is thick and wet. Very steep and long slope is prone to large wet loose snow avalanches.
Weather
The Japan Meteorological Agency is forecasting a slightly westerly wind, cloudy, and sunny in the evening, with a daytime high of 18 °C (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature is 7 °C (as of 4:45 a.m.), with no new precipitation in the past 24 hours.
