Avalanche Bulletin
更新日時: 2025/01/10 07:00
Myoko
Alpine Fair
Treeline Fair
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Dangerous conditions with the potential for very large avalanches. This is a day that requires maximum attention to terrain and a large safety margin. Even if you are in the forest, check for large start zones above you. Westerly winds are increasing. Its effects may extend into the forest. Watch the slopes carefully and notice wind slabs. For less experienced skiers, this is a good day to enjoy fresh powder snow in the ski resort. When you ski in the resort, please pay attention to the signs and ropes.
Avalanche Problem
ウインドスラブ Wind slab
Westerly to northwesterly winds in excess of 20 m/s are blowing at higher elevations.
ストームスラブ Storm slab
Note where the upper layer of snowpack has a tendency to slab.
概要
Avalanche
Yesterday (9th), a size 1 loose snow avalanche was reported on a very steep slope. There was also a size 2 glide avalanche at a very low elevation.
Snowpack
The depth of the snowfall, which has been ongoing since January 6, is 70-80 cm. This new snow is slowly sintering and settling, and is observed to be generally rightside-up structured (denser in the lower layers). At these times, the places where the snowpack tends to be unstable are slopes with an upside down structure formed by dense slabs that have been redistributed by the wind. Since last night, westerly winds have been very strong.
Weather
The Japan Meteorological Agency is forecasting winds out of the west, slightly stronger, snow, and a daytime high of 3 °C (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature was -10 °C (as of 5:45 a.m.), with 9 cm of snow having fallen in the past 12 hours and 25 cm in the past 24 hours. The Niigata District Meteorological Office issued a heavy snowfall advisory at 5:28 a.m. on January 10, predicting 50 cm of snowfall in the Myoko area over the next 24 hours until 6 a.m. on January 11.
