Avalanche Bulletin
更新日時: 2025/03/08 07:00
Niseko Yotei Yoichi Shiribeshi
Alpine Fair Limited alpine observations
Treeline Good
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
SW Hokkaido continues to be a tale of 2 snowpacks. The Yoichi area has received considerably more snow over the past week and the crusts are now buried by ~60cms of new snow. Bonding of the new snow to the old crusts is improving and these crusts are now sufficiently deep to be stubborn and difficult to trigger however the consequences of a failure are larger. In the South and East of the region, the crusts are much shallower, easier to trigger and more pronounced on solar aspects. Monitor the change in snow conditions as the sun comes out and the solar input causes the storm snow to settle into a slab.
Avalanche Problem
ウインドスラブ Wind slab
Moderate NW winds built windslab on leeward slopes at all elevations yesterday.
ストームスラブ Storm slab
Warm weather and solar input today will promote storm slab formation.
点発生乾雪雪崩 Dry Loose snow
Loose dry avalanches are expected on steep slopes today particularly in areas not affected by recent winds.
概要
Avalanche
Loose dry avalanches were reported on steep slopes yesterday. No slab avalanches were reported.
Snowpack
Kiroro area received another 15cms of overnight snowfall which brings the storm total in that area to ~60cms. The rest of the region has received lighter snowfalls all week with ~5cms overnight bring the settled storm total to ~20cms. Storm instabilities have been found in some parts of the region at varying depths and the bond of the new snow to the previous crusts in improving particularly on polar aspects where the crusts are less well defined. Moderate North winds yesterday built windslab on leeward slopes.
Weather
A high pressure system approaching from the SW brings a break in the storm and calmer weather today. Overnight temperatures dropped to -13C in Kutchan but will rise to a high of 1C during the day today. A mix of sun and cloud cover with no new snowfall is expected today. Winds will be light to moderate from the west.
