雨と強風続く。山頂視界不良で低体温症リスク高まる

Currently, at the summit of Sapporo Kokusai Ski Resort, light rain persists with a temperature of 4.5℃, feeling like -0.2℃. Visibility is less than 1km due to fog. Throughout the day, drizzle will continue, with temperatures hovering around 5℃. However, wind gusts are expected to exceed 20m/s. There is a 3℃ temperature difference between the summit and the base, where rain and strong winds are also present. The summit area poses a particularly high risk of hypothermia due to sub-zero wind chill, combined with persistent rain and wind.

For any outdoor activity, ensure you wear a moisture-wicking base layer, a fleece or light down mid-layer, and a waterproof and breathable outer shell for both top and bottom. Rain gear is absolutely essential. The ground will be wet due to continuous precipitation, and muddy conditions are expected in some areas. There is no snow cover, so crampons or microspikes are not needed, but waterproof hiking shoes capable of handling slippery surfaces are a must.

Under today's weather conditions, accessing the upper, exposed sections of Sapporo Kokusai Ski Resort, especially the open ski courses, is extremely challenging due to the combination of strong winds, low visibility, and low wind chill. These conditions highlight the specific risks of "summit temperature drop" and "reduced visibility due to fog or blizzard" inherent to this area. With gusts forecasted to exceed 23m/s, loss of balance and significant body temperature drop are unavoidable. Any ascent towards the summit should be approached with extreme caution, and it is advisable to avoid such attempts today.

Light drizzle will continue into the evening, but the weather is expected to improve by midnight, becoming mostly clear. Winds will gradually subside, but temperatures will drop to around 3℃. Even with improving conditions overnight, adequate cold weather gear remains crucial for any nocturnal activities.