利尻山 氷雨と濃霧。脆い火山礫凍結に注意

Current conditions on Rishiri-zan summit are severe: strong freezing rain is falling at -0.8°C, feeling like -4.5°C, with 98% humidity and limited visibility of 2.5km. At the base, strong freezing rain is also observed, but temperatures are 8.6°C, indicating a significant 9.4°C difference from the summit.

Throughout the morning, freezing rain will persist on the summit, with temperatures remaining below zero. While precipitation is expected to cease by midday, cloudy conditions will continue, and temperatures will hover around freezing. Winds will shift from NNE to ENE, with gusts potentially reaching up to 13.6m/s by 3 PM. Due to the freezing rain, the fragile volcanic scree above 9th station is wet and extremely slippery, with a high risk of ice formation.

Under these conditions, the risk of hypothermia is very high. Essential gear includes full waterproof and breathable outer shells, mid-layers such as fleece or light down, and moisture-wicking base layers. Warm gloves and a hat are indispensable. Given the wet and potentially icy surfaces, carrying microspikes or crampons is strongly recommended. With dense fog limiting visibility to 2.5km, navigation on the crumbling terrain above 9th station, including the Oshidomari Course, becomes hazardous, increasing the risk of getting lost or falling. Attempting a summit push today is extremely dangerous and should be avoided.

Temperatures will drop significantly overnight, reaching around -8°C under clear skies. All mountain activities should conclude before nightfall.