Avalanche Bulletin
更新日時: 2023/02/23 06:00
Myoko
Alpine Fair
Treeline Fair
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
This is a day to watch for unstable snow remaining in certain terrains. Although the clumps of new snow are well on their way to stabilization, caution is still needed in the following two slopes. One is wind slabs that have formed on slopes where the terrain is not shaped to support snowpack. The other is unstable snow remaining on extreme terrain features. The mountain is expected to be crowded today. While looking for no-track slopes, be careful not to enter slopes where unstable snow remains. At lower elevations, be alert for the possibility of glide cracks being hidden by new snow and loose snow avalanches due to high daytime temperatures and solar radiation. If snowballs begin to roll across the snow surface, it is a sign that the snow is losing strength. Have a good day.
Avalanche Problem
ウインドスラブ Wind slab
Be wary of slabs formed on slopes whose terrain is shaped to not support snow accumulation.
ストームスラブ Storm slab
Beware of unstable snow remaining in extreme shapes.
点発生湿雪雪崩 Wet Loose snow
Be aware of high daytime temperatures and the effects of solar radiation.
概要
Avalanche
Yesterday (February 22), several size 1.5-2.5 slab avalanches were observed on east to south-facing slopes in Alpine. All of these occurrences were during stormy weather. In addition, several size 1 wet loose snow avalanches were observed on sunny slopes.
Snowpack
The storm snow (19th-21st) is settling steadily. No significant fragility has been observed within this new snow. Around the ridge and along the sides of the ridge, where there is strong wind exposure, the snowpack has been scraped away, exposing a hard snow surface. On the leeward side, wind slabs have formed, and there is soft new snow where the wind has little influence. On lower elevation, sunny slopes, crusts have formed due to yesterday's fine weather.
Weather
The Japan Meteorological Agency is forecasting southerly winds, daytime, westerly winds, cloudy, afternoon to evening, sunny, with a high of 10° (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature is -5° (as of 5:45 a.m.).
