Avalanche Bulletin
更新日時: 2025/03/12 05:30
Hakuba
Alpine Low Unclear extent of snowfall
Treeline Fair Depends on the degree of temperature rise
Below Treeline Fair Depends on the degree of temperature rise
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Be alert for avalanches caused by wet snow due to high temperatures. Stay away from slopes with glide cracks, as the danger of glide avalanches is rising. When passing under them, keep a good distance from your companions and move quickly. In addition, snow blocks left on cliff-like terrain are unstable. Look up when resting or stopping to see if there are any such hazards above you. Some ski areas also have course restrictions against glide avalanches. Pay attention to the ropes and signs and try to abide by them.
Avalanche Problem
全層雪崩 Glide slab
High temperatures continue and glide cracks are opening up. Today, warm southerly winds will enter the area and significantly increase temperatures. Even without rainfall, there will be a lot of meltwater, which will destabilize the slopes with glide cracks.
面発生湿雪雪崩 Wet slab
Be on the lookout for areas where snow from the subsequent stormy weather is on top of Melt-Freeze crusts (formed by the March 5 rainfall). Today's significantly warmer temperatures will allow the surface snow to become sufficiently wet to increase the risk of avalanches using the crust as a bed surface. The snow is so heavy that even small objects can easily cause injury. The likelihood of triggering is assessed as of the morning. Pay attention to changes during the day.
点発生湿雪雪崩 Wet Loose snow
Rating is as of the morning. Note changes during the day. If snowballs begin to appear, this is an indication that the bonding of the surface snow has decreased.
概要
Avalanche
Yesterday (11th), few people entered the mountain and no avalanche bulletin was received in the mountain area. Snowballs were observed near the foot of the mountain.
Snowpack
The mountains are in spring conditions. Yesterday, there was light rainfall at the base of the mountain and snow melted. In Alpine, it appears that there was some snow, but the amount appears to have been slight. Glide cracks are moving and there is concern about a glide avalanche. Glide avalanches can sometimes be generally identified by carefully following the movement of glide cracks, but in many cases there is difficulty in predicting them.
Weather
The Japan Meteorological Agency is forecasting southerly winds, cloudy skies, and rain in places late in the evening, with a daytime high of 17 °C (418 m elevation) for northern Nagano Prefecture. At AMeDAS Hakuba (elevation 703 m), the temperature is 1.1 °C (as of 5:00 a.m.), with 1.5 mm of precipitation in the past 24 hours. At the main ridge (elevation 2,400 m), the temperature is -1 °C (as of 5:00), with winds averaging 11 m/s and a maximum instantaneous wind speed of about 15 m/s.
