Avalanche Bulletin
更新日時: 2022/02/23 05:30
Hakuba
Alpine Low
Treeline Low
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Very dangerous avalanche conditions are ongoing. If you have experience with mountains, you may have experienced settling (sinking movement) due to the passage of time, even a large amount of snowfall. This movement is a good sign at some times, but at other times “conditions are in place for a larger avalanche to occur.” The field observation information above the forest limit is extremely limited, and there is a storm of westerly wind blowing on the main ridge line. Snowfall is weakening, but even if the frequency of occurrence decreases, the possibility of large-scale avalanches still exists. Avoid places at low elevations where there are wind-affected slopes, large terrain, very steep slopes, and terrain traps. If you are inexperienced, it's a good day to enjoy fresh snow in the ski area. Have a safe day
Avalanche Problem
ストームスラブ Storm slab
ウインドスラブ Wind slab
概要
Avalanche
Yesterday (22nd), a naturally occurring storm slab of size 2.5 was observed at an elevation of 1,500 m, on the east slope (Twitter, #nadare2022）されています。 In addition, when there was a slight visibility, several avalanche debris of size 3 that fill the valley muscles have been observed and reported.
Snowpack
As of yesterday, the mass snowfall from February 20 reached 100-150 cm in the below treeline, and the thaw-freezing layer formed in the clear weather on the 19th is buried under it. It has been observed in part that the combined state of this melting frozen crust and snow in stormy weather has improved at low elevations, but since it is buried so deep that stimuli cannot reach, the state is still Uncertainty remains high. Also, it is necessary to think that the instability of the stormy weather due to the heavy snowfall this time is “ongoing”. A plane avalanche of size 2.5 observed yesterday is evidence of this.
Weather
The Meteorological Agency forecasts the northern part of Nagano prefecture with northern winds, cloudy weather, occasional sunny weather, morning, temporary, snow, and a maximum temperature of 0℃ (elevation 418m). At the foot of Mt. Hakuba (elevation 703m), no new snowfall has been observed in the past 12 hours with a temperature of -5.6℃ (as of 5:00).
