Avalanche Bulletin
更新日時: 2023/02/21 07:00
Niseko Yotei Yoichi Shiribeshi
Alpine Low Strong northerly ridge top winds have created new wind slabs lee and cross loaded slopes yesterday.
Treeline Fair Strong NNW winds and new snow have continued to load lee slopes
Below Treeline Good Skier triggered Wind slabs were reported below tree line yesterday Chise area
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Light new snow overnight could hide yesterdays wind and storm slabs. Glide cracks are numerous and deep. These cracks could also be hiding under the new snow. Keep track of your partners and give the wind slabs more time to settle before stepping out into larger, steeper alpine terrain where the wind slabs have formed. If the sun does shine longer than forecasted a rapid warming of the new snow could increase the avalanche danger on the solar aspects. Watch for hard tree bombs hidden under the new snow.
Avalanche Problem
ウインドスラブ Wind slab
Natural and human triggered wind slab avalanches were reported yesterday. With more wind and new snow yesterday, wind slabs will continue to be a problem today.
点発生乾雪雪崩 Dry Loose snow
Sheltered areas where new snow has deposited on very steep terrain remain a problem today.
概要
Avalanche
Natural and human triggered wind slab avalanches reported yesterday. Wind slabs will continue to be a problem today. These slabs will be loaded more and hidden under lighter low density snow. South Yotei yesterday was in the sun and had size 1 & 2 natural slab avalanches, with 25cm crown slide on the 2/19 temperature crust.
Snowpack
Low density new snow overnight covers yesterdays wind and storm slabs. Underneath lays a temperature crust 2/19. Near crust facets may have formed around this crust. This crust is more developed on the solar aspects at tree line and below. Deeper in the snow pack the snow has settled and gained strength.
Weather
Today: Yoichi area is forecasted to receive light to moderate snow with light NNW winds. Temperatures will remain well below freezing. Shiribetsu area morning sun possible, light NNW winds and very light snow possible in the afternoon.
