Avalanche Bulletin
更新日時: 2023/11/26 07:00
Tateyama
Alpine Good
Treeline
Below Treeline
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Be aware of newly forming induced wind slabs on steep slopes just below the ridge and branch ridges. In addition, human-triggered avalanches continued to occur until the 23rd. Be aware that this instability is localized, hard to find, and persistent. Beware of triggering from extremely steep slopes with thin snowpack. The slab and bed surface are hard, which allows the fracture line to spread significantly and increase the size of the avalanche. We recommend adhering to the action principle of reducing the time spent in avalanche start zones, tracks, and runout zones. There are many exposed "terrain traps" such as rocks and gullies that can increase the damage of even small avalanches. Be careful of collisions with rocks thinly concealed by snow.
Avalanche Problem
ウインドスラブ Wind slab
Beware of triggering on steep slopes just below the ridge line at higher elevations.
持続型スラブ Persistent slab
Beware of triggering from extremely steep slopes with thin snowpack.
概要
Avalanche
Yesterday (25th), there was a report of observing multiple human-triggered slab avalanche size 1s on an extremely steep downwind slope.
Snowpack
In the Murodo area, new snowfall due to the stormy weather up to yesterday has amounted to 30-60 cm and is gradually bonding. On the higher elevation ridges, new wind slabs are expected to form due to wind-driven snow movement. On the southerly slopes, there are crusts at the boundary of the new snowfall, but bonding is not bad. The old snow settled well and bonded well, but there were still local instabilities, which existed as persistent slabs and triggered avalanches from areas where the snowpack was thin. Care should be taken as a new snowfall load is applied here.
Weather
The temperature at 2380m as of 6:00 am is -2°C, with no new snowfall since yesterday. The Japan Meteorological Agency forecasts that the weather will be moderately covered by high pressure, but is expected to be affected by cold air and pressure troughs, resulting in clear skies and occasional cloudiness.
