Avalanche Bulletin
更新日時: 2024/03/18 06:00
Myoko
Alpine Low Snowfall amount unknown
Treeline Low Snowfall amount unknown
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
At higher elevations, watch out for slabs that have formed from the snowfall since last night. Uncertainty is high because the amount of snowfall is unknown, but since very strong winds are blowing on the main ridge, it is necessary to assume that the amount of snow is at least enough to form slabs to shed people. Also, due to yesterday's high temperatures and rainfall, the snow surface is hard and frozen in some areas. Be careful of slips and falls. Melting of snow at lower elevations is underway. Careful tour planning and conservative route selection on site are required.
Avalanche Problem
ストームスラブ Storm slab
Very strong northwest winds are blowing at elevation. Be alert for slab formation on the downwind side.
全層雪崩 Glide slab
At very low elevations, glide cracks are expanding due to yesterday's rainfall and high temperatures. Please stay away from slopes with glide cracks.
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 (17th), several size 1 loose snow avalanches and size 1.5 glide avalanches were observed.
Snowpack
Yesterday (17th) brought high temperatures and some light rainfall in the afternoon. This made the upper snowpack sufficiently wet, and snowballs and avalanches of wet snow were observed. Subsequently, the pressure changed to a winter pressure pattern last night, and cold air began to flow in. Snow accumulation at lower elevations is a spring cycle, with repeated Melt-Freeze and Freeze. At higher elevations, we need to keep an eye on the snowfall from last night.
Weather
The Japan Meteorological Agency is forecasting a northwesterly wind, slightly strong, snowy, occasionally cloudy, daytime high of 6 °C (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature is -6 °C (as of 4:45 a.m.), with 3 cm of snow having fallen in the past 12 hours.
