Avalanche Bulletin
更新日時: 2024/02/25 05:30
Hakuba
Alpine Fair Note the start of snowfall
Treeline Fair Note the start of snowfall
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Watch out for unstable snow that remains in terrain pockets. Be wary of slips and falls, as icy snow surfaces are hidden under thin new snow. Be careful when setting routes to avoid entering steep slopes. The heavy rainfall on the 21st has caused the snow to melt in the lower elevations. Due to the lack of significant snowfall since then, some tour routes that are usually accessible may not be available this year. Please plan carefully.
Avalanche Problem
ウインドスラブ Wind slab
In Alpine, instability in the undo slab formed by yesterday's winds may remain in terrain pockets. As of this morning, the wind direction on the main ridge has shifted to the southwest, but it is weak and does not appear to be having a significant impact. If wind speeds increase in the future, use caution.
概要
Avalanche
No new avalanches were reported yesterday (24th).
Snowpack
There is a hard, Melt-Freeze layer on the snowpack surface layer, with about 10-15 cm of fresh snow on top of the hard, Melt-Freeze layer. Yesterday, a sea of clouds spread over the area with a cloud top around 1,900 m elevation. Because of this, on the south face of the alpine area, the snow was affected by solar radiation, but on the north face it was well dried out, partly due to radiation. Northwest winds (up to about 15 m/s) have been blowing on the main ridge until yesterday noon, forming wind slabs in the alpine area.
Weather
Today, a low pressure system is expected to move east-northeast over the south of Japan. The Japan Meteorological Agency is forecasting southerly winds, cloudy skies, snow before noon, and a daytime high of 3 °C for northern Nagano Prefecture. At 703 m elevation in Hakuba, the temperature is -1.7 °C (as of 5:00 a.m.), and no new snow has fallen in the past 12 hours. The Nagano District Meteorological Observatory is forecasting 15 cm of snowfall for northern Nagano Prefecture in the 24-hour period ending at 6:04 a.m. on May 25.
