Avalanche Bulletin
更新日時: 2025/01/03 05:30
Hakuba
Alpine Fair Watch out for future wind and snow changes.
Treeline Fair Watch out for future wind and snow changes.
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Watch out for unstable snow on very steep slopes. Even small avalanches can have serious consequences if there are "terrain traps" such as cliffs, trees, or deep gullies below them. Also, the weather is obviously getting worse. Imagine having to bivouac in a very difficult environment if you get into trouble. In the forest at lower elevations, watch out for glide cracks hidden by fresh snow.
Avalanche Problem
ストームスラブ Storm slab
Watch out for soft slabs on very steep slopes. Light northerly winds (7 to 9 m/s) are blowing on the main ridge and the snow is moving to its leeward side.
点発生乾雪雪崩 Dry Loose snow
Be alert for very steep slopes, where the snow tends to accumulate without the influence of the wind. It is about -15°C (as of 5:00) on the main ridge, and sintering can only proceed slowly.
概要
Avalanche
Yesterday (2nd), several size 1 loose snow avalanches of size 1 were observed on the north slope at elevations of 1,500-1,900 m. All were caused by ski cuts.
Snowpack
The upper part of snowpack has a recent snowfall of about 20 cm, mainly in the northern part of the Hakuba Valley, with little wind influence and low cohesion. The loose snow avalanches observed yesterday are a result of this characteristic. The large amounts of snowfall at the end of the year form the middle layer of the snowpack and are promoting sintering, and no major problems have been observed. At very low elevations, the high temperatures of the past few days have caused wet or wet conditions, and glide cracks have appeared.
Weather
The Japan Meteorological Agency is forecasting northerly winds, later, southerly winds, cloudy, night, snow, and a daytime high of 6 °C (418 m elevation) for northern Nagano Prefecture. At Amedas Hakuba (elevation 703 m), the temperature is -1.9 °C (as of 5:00), and there has been no new snowfall in the past 12 hours.
