Avalanche Bulletin
更新日時: 2023/03/01 06:00
Myoko
Alpine Fair
Treeline Fair Beware of high daytime temperatures and solar radiation
Below Treeline Good Beware of high daytime temperatures and solar radiation
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Continuing from yesterday, it is a spring day. Slopes that were hard and icy in the morning will lose strength as the temperature rises and the sunny slopes take hold. Be sure to notice the changes. Wet snow is very heavy, so don't let your guard down just because it is small. A "terrain trap" below you can be deadly. Also, stay away from slopes that already have glide cracks in them. Even though the snow surface is frozen, there was a sufficient amount of thawing water yesterday and the strength of the lower part of the snowpack remains reduced. If you are passing through deep gully terrain at the end of your tour, you should consider the glide-cracked areas on its flanks to be highly hazardous. Please move quickly, and please be creative in your moves so that you do not stagnate at the bottom of that slope. Have a good day.
Avalanche Problem
全層雪崩 Glide slab
The cool nighttime temperatures were weak and the same high temperatures are forecast for today as yesterday. Stay away from slopes that already have glide cracks.
点発生湿雪雪崩 Wet Loose snow
Watch out for snow changes due to high daytime temperatures and strong solar radiation.
ウインドスラブ Wind slab
Be careful of unstable slabs that remain in extreme terrains with strong convexity and cliffs below.
概要
Avalanche
Yesterday (February 28), several size 2 glide avalanches were observed and reported Below Treeline. Numerous snowballs were also reported.
Snowpack
Yesterday's high temperatures and strong solar radiation wet the snow Below Treeline and caused it to lose its strength. The surface snow is now frozen due to radiative cooling, but high daytime temperatures are forecast again today, so we need to watch for changes in the snow. Expansion of glide cracks has also been observed. On the other hand, there is enough settled and dry snow in the north near the Treeline.
Weather
The Japan Meteorological Agency is forecasting winds from the south, later, west, clear, later, cloudy, night, rain, and high temperatures of 16° (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature is -3° (as of 4:45 a.m.).
