Avalanche Bulletin
更新日時: 2024/03/28 05:30
Hakuba
Alpine Fair
Treeline Fair Keep in mind solar radiation and temperature rise during the day
Below Treeline Fair Watch out for high daytime temperatures and solar radiation
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
In alpine areas, watch out for unstable slabs that remain in localized areas of extreme terrain. Also, be alert for slips and falls, as many areas have very hard exposed ice. Very high temperatures are forecast for today, and even stronger solar radiation will have a significant impact on the snow. Please pay close attention to changes in the surface snow during the day. Avalanches caused by wet snow are very heavy and can easily topple people, even small ones. Combine that with the "terrain trap" factor and the consequences can be serious. The weather in the Hakuba Valley is currently very clear, but it is predicted to be very rough starting this evening, so please plan your activities with this in mind. Don't forget sunscreen and plenty of water. Have a good day.
Avalanche Problem
ストームスラブ Storm slab
Watch out for unstable slabs that remain in extreme terrain pockets.
点発生湿雪雪崩 Wet Loose snow
Rating is as of morning. Note the effects of daytime solar radiation and high temperatures.
全層雪崩 Glide slab
Rating is as of morning. High temps are in the forecast with southerly winds. Be alert for extreme terrain with glide cracks.
概要
Avalanche
Yesterday (27th), several size 1-2.5 slab avalanches were observed on slopes at elevations between 2,100 and 2,600 meters. In addition, a size 1 loose snow avalanche was observed on a very steep southern slope near 2,000 m elevation.
Snowpack
Rainfall on March 26 created a hard Melt-Freeze layer with rain gullies up to the main ridge. Subsequent snowfall (10-15 cm), with northerly winds, has deposited on top of this ice. In areas where the ice layers were exposed to the wind pounding, avalanches occurred where fresh snow was locally deposited on isolated terrain. The cold air remained, and clouds remained in the middle elevation bands, so the effect of solar radiation on the snow at lower elevations was weak. The persistent slab has been removed from the notation because the ice layers forms up to the main ridge line.
Weather
Today, high pressure is expected to prevail at first, but low pressure with a front is expected to move into the Sea of Japan during the night. The Japan Meteorological Agency is forecasting southerly winds, cloudy skies, late evening showers, and daytime highs of 16 °C for northern Nagano Prefecture. At 703 m elevation in Hakuba, the temperature is -3.6 °C (as of 5:00), with no new snowfall in the past 12 hours.
