Avalanche Bulletin
更新日時: 2025/03/08 06:30
Myoko
Alpine Fair
Treeline Fair
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Conditions require caution in certain terrain. Yesterday's strong winds have created wind slabs, and beneath the slabs are hard-frozen Melt-Freeze crusts. This is a snowpack structure that can easily trigger avalanches, and even small avalanches can slide off and cause serious consequences. In addition, the previous rough snow surface is hidden under the fresh snow, making it difficult to ski. Snow blocks that have fallen from trees are very hard and can cause injuries and falls. Please ski with caution.
Avalanche Problem
Underneath the slab is a hard snow surface, making conditions highly reactive to human stimulation. Observe the snow surface conditions carefully and notice the slab formation. And avoid terrain that is convex or unsupported.
ストームスラブ Storm slab
In areas where the wind is weak, observe if the upper layer of snow cover has the characteristics of a slab. If the new snow on the melting crust has an inverse structure, consider the conditions to be inducible.
概要
Avalanche
Yesterday (7th), several wind slab avalanches of size 1-1.5 were observed at the ski resort's morning safety control. Significant development of snow cover was also reported.
Snowpack
The new snow from the 6th is on top of the Melt-Freeze crust formed by the March 5th rainfall. This new snow has been heavily redistributed by yesterday's northerly winds, forming wind slabs on the downwind slopes. In addition, hard Melt-Freeze crusts are exposed in some areas where strong northerly winds are blowing. Limited information is available on the bonding of new and old snow, so be sure to check the intensity of this bonding in the field.
Weather
The Japan Meteorological Agency is forecasting winds from the south, then from the north, cloudy, snow or rain in places at night, and daytime highs of 6 °C (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature is -13 °C (as of 4:45 a.m.), with no new snowfall in the past 12 hours.
