利尻は快晴広がるも山頂は低温 稜線風に備えよ

Rishiri-zan is experiencing clear skies with excellent visibility exceeding 20 kilometers. However, the summit temperature is 3.1 degrees Celsius, with a perceived temperature of minus 0.5 degrees Celsius, a significant drop from the base's 12.5 degrees Celsius. Summit temperatures will remain around 3 to 4 degrees Celsius throughout the day, with wind speeds between 2.78 and 4.33 meters per second and gusts potentially exceeding 10 meters per second. Essential cold weather gear is mandatory.

There is no snow cover, and the ground is generally dry. However, shaded areas, north-facing slopes, and sheltered gullies may still be damp or frosty. Special caution is advised on the fragile volcanic scree terrain from the 9th station to the summit, as it can be slippery when wet. Crampons or microspikes are not necessary, but a waterproof and windproof outer layer, a mid-layer such as fleece, and a quick-drying base layer are essential. Gloves and a hat should also be carried.

The risk of hypothermia is present due to the low daytime temperatures and wind. While body temperature may be maintained during activity, it can drop quickly during breaks or periods of inactivity. Take frequent short breaks, refuel with snacks, and diligently manage your body temperature. The risk of lightning is low, but be cautious of losing balance due to strong gusts. Both the Oshidomari and Kutsugata courses involve steep volcanic scree slopes directly below the summit, requiring careful foot placement.

After 6 PM, the sky will become partly cloudy, and temperatures will drop below freezing. Winds will also pick up slightly at night, so avoid activity after sunset. While no significant alerts have been detected by the automated risk assessment, always be mindful of sudden changes in conditions due to the island's unique exposure to sea winds, and refrain from any overly ambitious undertakings.