Avalanche Bulletin
更新日時: 2025/02/09 06:00
Niseko Yotei Yoichi Shiribeshi
Alpine Fair
Treeline Fair
Below Treeline Fair
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
There continue to multiple avalanche problems of note in the forecast and cautious travel is highly recommended. Monitor the amount of new snow in the area you are travelling and the development of slab quality within the surface snow. Be prepared to adjust to lower angle and lower consequence terrain if conditions dictate. The uncertainty regarding the distribution and reactivity of the Persistent slab also complicates decision making and encourages conservative choices.
Avalanche Problem
ウインドスラブ Wind slab
Moderate NW winds have re-distributed the storm snow to leeward slopes
持続型スラブ Persistent slab
Tests continue to produce propagating results on the Jan. 28 PWL. The persistent slab will be difficult to trigger but could result in a large size avalanche
ストームスラブ Storm slab
The overnight snow may form into a storm slab particularly at lower elevations as temperatures rise during the day
概要
Avalanche
A size 1 skier accidental windslab avalanche was reported BTL on SE Shiribetsu yesterday.
Snowpack
15-20cms of new snow fell overnight. On solar aspects, the new snow fell on recently re-frozen surfaces that warmed up during the warm sunny period yesterday morning. On polar aspects, the new snow added to the existing storm snow with up to a meter of low density snow overlying the Jan. 28 PWL. Moderate NW winds re-distributed the overnight snow to leeward slopes. Snowpack tests across the region yesterday continued to produce concerning results on the Jan. 28 PWL. All previous tests had found the PWL present and reactive in the North of the zone however an additional test on a North slope near Rusutsu resort at 800m produced a propagating ECT result on the Jan. 28 PWL.
Weather
A deep low to the East of Hokkaido is drawing moderate NW winds across the region bringing cool temps and continued snowfall. 5-10cms of new snow is expected through the day today with temperatures reaching a high of -1C in the valley today. Winds will be moderate NW with overcast skies expected through the day.
