Avalanche Bulletin
更新日時: 2024/02/18 05:30
Hakuba
Alpine Fair Note the effects of solar radiation and temperature rise
Treeline Fair Note the effects of solar radiation and elevated temperatures.
Below Treeline Good Watch for rising temperatures and solar radiation effects.
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
The overall trend is the same as yesterday. A large temperature increase is predicted, so be on the lookout for loose snow avalanches caused by wet snow due to solar radiation and high temperatures. Wet snow is very heavy and can easily scoop even small avalanches underfoot. If there are "terrain traps" such as cliffs or trees below where you fall and slide, the consequences can be serious. Avalanches caused by wet snow with weakened bonding can also occur in the forests if the slope is steep enough. Do not let your guard down and pay attention to the slope above you, even when walking on forest trails. Take sunscreen and plenty of water with you. Have a good day.
Avalanche Problem
点発生湿雪雪崩 Wet Loose snow
Elevated temperatures and solar radiation during the day increase the risk.
全層雪崩 Glide slab
Stay away from slopes with glide cracks.
ウインドスラブ Wind slab
Note instability of old slabs remaining in terrain pockets
概要
Avalanche
Yesterday (17th), many size 1-1.5 loose snow avalanches were observed on steep south-facing slopes due to elevated temperatures and solar radiation. Size 1.5 glide avalanches were also reported. On the other hand, a size 1 wind slab avalanche triggered by a skier was reported on the eastern slope of the Treeline.
Snowpack
Below treeline conditions are spring conditions. The snow is frozen hard in the morning and becomes wet during the day due to rising temperatures and solar radiation. Glide cracks are expanding, and numerous wet loose snow avalanches were observed yesterday. At elevations above the Treeline, spring and winter are mixed. Where the effects of sunny slopes and rising temperatures are present, crusts are forming and making skiing difficult, while good dry snow remains on some of the northern slopes. The instability of the dry snow has generally dissipated, and the conditions are good if one is wary of the unstable snow remaining in terrain pockets.
Weather
The Japan Meteorological Agency is forecasting southerly winds, clear skies, cloudy evenings, and daytime highs of 16 °C for northern Nagano Prefecture. At 703 m elevation (Hakuba), the temperature is -0.2 °C (as of 5:00 a.m.), with no new snowfall in the past 12 hours.
