Avalanche Bulletin
更新日時: 2024/01/26 05:30
Hakuba
Alpine Low Be wary of wind slabs formed in isolated areas of terrain.
Treeline Low There is a large avalanche potential.
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Terrain selection is the key day. The snowfall has subsided, but the instability of the snowpack has not yet been resolved. Instead of jumping into a big slope, it is necessary to start with a small safe terrain and check the snowpack condition. In gully terrain, the snowpack varies depending on the direction of the side of the terrain. It is common for a small avalanche to start on the side of a gully and then expand in size by engulfing the snowpack in the center of the gully. Consider the size and slope of the terrain. Look for areas where wind effects are weak and avoid windslabs. Use conservative route-setting and ensure basic group management. Snowpack has increased, but is still low at lower elevations compared to previous years. Be alert for terrain traps.
Avalanche Problem
ウインドスラブ Wind slab
Considering the continuous very strong westerly wind (20 m/s) on the main ridge, and also that the lifts were closed yesterday afternoon.
ストームスラブ Storm slab
Consider that the low temperatures are continuing, so the fresh snow changes slowly.
概要
Avalanche
Yesterday (25th), a human-triggered size 1 storm slab avalanches were observed Below Treeline.
Snowpack
The series of snowfalls that began on the evening of the 23rd, even in the northern part of the Hakuba Valley, subsided yesterday evening (25th). Snowfall from this stormy weather has reached 60-80 cm in the upper treeline. Windy conditions also intensified at lower elevations yesterday afternoon, causing some ski lifts to be shut down. Limited observations indicate that the bonding of new and old snow is not too bad Below Treeline.
Weather
The Japan Meteorological Agency is forecasting northerly winds, cloudy, occasionally sunny, and in some places snowy conditions with a daytime high of 2 °C for northern Nagano Prefecture. At 703 m elevation (Hakuba), the temperature is -3.6 °C (as of 5:00), with no new snowfall in the past 12 hours.
