Avalanche Bulletin
更新日時: 2025/02/28 05:30
Hakuba
Alpine Low
Treeline Low
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
The higher elevations to the north will retain a winter look, while the lower elevations to the south will make for a spring day. Those seeking higher elevations should be aware of unstable wind slabs remaining in terrain pockets. The ridge has been pounded by strong north winds, exposing hard snow surfaces, so be on the lookout for slips and falls. At lower elevations, notice changes in the snow due to daytime warming and solar radiation. The appearance of snowballs is a sign that the snow is becoming unstable. Because of the abundance of snow this season, glide cracks are forming that are very deep. Be aware of the changing slopes. Have a good day.
Avalanche Problem
ウインドスラブ Wind slab
The winds, which had weakened yesterday afternoon, have picked up again since mid-night. Watch out for new wind slabs that have formed by this morning. With warmer air and higher temperatures in Alpine, slabs are forming quickly. Be on the lookout for slabs that have formed in areas where the snowpack is likely to be unstable, such as convexities.
ストームスラブ Storm slab
Watch out for unstable slabs that form on very steep slopes, unaffected by the wind.
点発生湿雪雪崩 Wet Loose snow
Rating is as of morning. Strong sunshine and high temperatures affect the steep south-facing slopes, so watch for snow changes during the day.
概要
Avalanche
Yesterday (27th), several size 1-2 slab avalanches were observed on the east to south facing slopes. In addition, size 1-1.5 dry loose snow avalanches were observed on very steep slopes at higher elevations, and size 1 wet loose snow avalanches were observed on lower elevations on the southern slopes.
Snowpack
Yesterday (27th) was a day of winter and spring living together. At higher elevations, there was instability due to the most recent snowfall, and at lower elevations, wet snow was observed due to the strong solar radiation. Higher temperatures than yesterday are forecast for today, so the effects of these temperatures need to be taken into account.
Weather
The Japan Meteorological Agency is forecasting northerly winds, sunny, occasionally cloudy, with a daytime high of 12 °C (418 m elevation) for northern Nagano Prefecture. At Amedas Hakuba (elevation 703 m), the temperature is -7.2 °C (as of 5:00 a.m.), with no new snowfall in the past 12 hours. At the main ridge (elevation 2,400 m), the temperature is -2.9 °C (as of 5:00), with northerly winds averaging 14 m/s and maxing out at 18 m/s.
