Avalanche Bulletin
更新日時: 2023/01/27 05:30
Hakuba
Alpine Fair
Treeline Fair
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Dangerous avalanche conditions. Watch out for storm slabs that have formed from the snowfall up to this morning. The snow has cooled and is in very good condition, so low-angle slopes can be enjoyable. When visibility is poor, think carefully about whether there are any large start zones above you. Principle behaviors, such as stopping at safe spots and skiing one at a time, will reduce the damage of accidents. "Terrain traps" lurk in the forest. Imagine what is under the snowpack and choose a safe line.
Avalanche Problem
ストームスラブ Storm slab
New storm slab formed by snowfall up to this morning. Note that the snowfall is being driven by southwest winds.
点発生乾雪雪崩 Dry Loose snow
On a very steep slope
持続型スラブ Persistent slab
Whumpfing sounds and hazardous test results (Sudden Collapse) due to FCs formed on top of Melt-Freeze crusts formed by rainfall on January 14 has been observed continuously since January 21. In wind-affected areas, this instability is occurring only in isolated pockets within a given slope, making it difficult to recognize the hazard.
概要
Avalanche
Visibility was poor from the upper Below Treeline yesterday (January 26) and no new avalanche reports have come in. However, there were reports of hearing whumpfing sounds.
Snowpack
The snowpack has a pretty big spatial variability. In wind-affected slopes, very hard Melt-Freeze crusts formed by the January 14 rainfall are exposed, while in other slopes, 20 cm of new snow up to this morning is on top of the recent storm snow. Overall, the snow from the January 24-25 storm is settling and no significant instability has been observed Below Treeline.
Weather
The Japan Meteorological Agency is forecasting winds from the south, later from the north, cloudy, night, snow, and a maximum temperature of 3°C (418 m elevation) for northern Nagano Prefecture. At the valley of Hakuba (elevation 703m), the temperature is -4.0°C (as of 5:00).
