Avalanche Bulletin
更新日時: 2024/03/17 05:30
Hakuba
Alpine Low Keep in mind the rising temperature and solar radiation during the day
Treeline Low Keep in mind the rising temperature and solar radiation during the day
Below Treeline Fair Keep in mind the rising temperature and solar radiation during the day
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
At higher elevations, watch for wind slabs that have hardened over time. Consider that avalanches can be triggered on extremely convex or very steep areas where the terrain does not support the slope downslope. Also, on slopes that are strongly affected by sunny slopes, wind slab hardness decreases during the day, making them more prone to triggering. At lower elevations, conditions are spring conditions. High daytime temperatures and solar radiation will cause the snow to turn wetter and less intense. Pay attention to the slopes above you. Be alert for glide avalanches from the flanks, especially at the end of the tour, when the route descends the gully line. The weather will be bad in the evening. Have a good day while considering an early descent.
Avalanche Problem
ウインドスラブ Wind slab
Gale force winds subsided yesterday afternoon (16th), but are back this morning with westerly winds averaging around 20 m/s on the main ridge. However, since most of the snow has already been blown away, the subject of today's management is to watch out for wind slabs, which have been time lapsed and have increased in hardness. Be on the lookout for areas where terrain does not support snowpack and where snowpack is thin.
点発生湿雪雪崩 Wet Loose snow
The evaluation is as of the morning. Elevated temperatures and solar radiation during the day will increase the likelihood of induction. Higher temperatures than yesterday are forecast. Watch for snow changes during the day.
全層雪崩 Glide slab
高い気温が予報されています。グライドクラックが開いている斜面から離れるようにしてください。
持続型スラブ Persistent slab
The danger of persistent slabs from ice layers or Melt-Freeze crusts formed by the February 21 rainfall and faceted snow that formed on top of them remains highly uncertain.
概要
Avalanche
Yesterday (16th), several size 1-2 wind slab avalanches were observed that appeared to have occurred within the past 24 hours. Numerous snowballs were also observed at lower elevations.
Snowpack
Gusty winds blew from the afternoon of the 15th to the 16th, recording a maximum instantaneous wind speed of just under 50 m/s. As a result, on the morning of the 16th, it was reported that the roof of the men's DH start house flew off and the women's DH start house tilted at Happo One Ski Resort. The effects of these strong winds were extremely widespread, causing wind slabs to form in various areas. In addition, unskiable crusts have formed on the snow surface in some areas. Due to the persistent high temperatures, the snow is still dry in the north, at higher elevations than the treeline, but in other areas, the snow is moist or wet.
Weather
The Japan Meteorological Agency is forecasting southerly winds, sunny, occasionally cloudy, rain or snow in the evening, and daytime highs of 18 °C (65 °F) for northern Nagano Prefecture. At 703 m elevation, the temperature is -2.7 °C (as of 5:00 a.m.), with no new snowfall in the past 12 hours.
