Avalanche Bulletin
更新日時: 2025/02/13 05:30
Hakuba
Alpine Fair
Treeline Fair
Below Treeline Fair Low elevations with little snowfall are "2 Moderate"
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
This is the start of a new round of stormy weather. However, its duration will likely be short-lived, with a weather recovery forecast for tomorrow. At higher elevations, watch out for instability in the new snow that has been falling since yesterday afternoon. Snow that fell when winds were light is hiding under new snow accompanied by extremely strong winds since dawn. Avoid large slopes and take safety margins in terrain. When visibility is poor, it is difficult to notice hazards on slopes above you. Use topographic maps and consider the avalanche terrain. For inexperienced skiers, resort skiing is recommended. It is fun to ski on the packed snow course.
Avalanche Problem
ストームスラブ Storm slab
Below treeline was evaluated at higher elevations where rainfall did not occur during the night.
概要
Avalanche
Yesterday (12th), a naturally occurring slab avalanche was observed on the southeast slope of Alpine. Details are unknown as the observation was made from a distance. In addition, several old avalanche tracks were reported that may have occurred during stormy weather.
Snowpack
Yesterday morning was the first fine weather in a long time, but there was a very strong westerly wind blowing on the main ridge. When the wind direction changed to the south around noon, clouds quickly spread and snowfall began. Later, temperatures rose and rain fell at lower elevations. Currently, temperatures are dropping, and at higher elevations, snowfall is accompanied by extremely strong westerly winds. New snow at the treeline and alpine limits is likely to be about 40 cm. The freezing level is likely to be around 1,600 m.
Weather
The Japan Meteorological Agency is forecasting northerly winds, snow, cloudy from midday, and a daytime high of 3 °C (418 m elevation) for northern Nagano Prefecture. At AMeDAS Hakuba (elevation 703 m), the temperature was 1.8 °C (as of 5:00 a.m.), and 25 mm of precipitation was observed in the past 12 hours. The Nagano District Meteorological Observatory forecast 15 cm of snowfall for northern Nagano Prefecture at 4:42 a.m. on February 13, for the 24-hour period ending at 6:00 a.m. on February 14. At the main ridge line (elevation 2,400 m), the temperature is -8°C, with northerly winds averaging 22 m/s and maximum wind speeds of 30 m/s or higher.
