Avalanche Bulletin
更新日時: 2024/03/17 06:00
Myoko
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
The gale force winds subsided yesterday afternoon (16th), but this morning they are once again blowing strong westerly winds 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 increased in hardness with the passage of time. Be on the lookout for areas where the terrain does not support snow accumulation and where the snowpack is thin.
全層雪崩 Glide slab
At lower elevations, positive temperatures continue. Stay away from slopes with glide cracks.
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.
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), many size 1-1.5 wind slab avalanches were observed that appeared to have occurred within the past 24 hours. Size 2 glide avalanches were also observed at lower elevations.
Snowpack
Gale force winds blew from the afternoon of the 15th to the 16th. The effects of this strong wind were extremely widespread, causing wind slabs to form in various areas. In addition, extremely slippery crusts have formed on the snow surface in some areas. The high temperatures have resulted in moist or wet conditions in other areas, although the snow is still dry in the north, at higher elevations than the treeline.
Weather
The Japan Meteorological Agency is forecasting a southerly wind, then westerly, slightly windy, sunny, then cloudy, rain in the evening, and a daytime high of 19 °C (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature is 3 ºC (as of 4:45 a.m.), with no new snowfall in the past 12 hours.
