羅臼岳 午前は雨と視界不良。午後回復へ

At 7 AM, the summit of Mount Rausu stands at 9.2°C, with a real feel of 7.4°C. Rain and 100% humidity shroud the peak in dense fog, limiting visibility to less than 1 km. The temperature difference from the base is -9.9°C. Showers are expected to continue through the morning, with gusts up to 17.6 m/s anticipated until 9 AM. This poses a high risk of losing balance on exposed ridges and significantly increases the chance of hypothermia. Wet rock surfaces are slippery, requiring extreme caution on routes such as the Rausu Course and Iwaobetsu Course.

The ground is muddy due to continuous rainfall. Full rain gear is essential. Given the sub-10°C real feel, layer with a quick-drying base, a light fleece or synthetic insulation mid-layer, and a waterproof-breathable outer shell to maintain body temperature. Poor visibility heightens the risk of getting lost, so a map, compass, or GPS is indispensable. Continued vigilance is also needed for potential slips on any remaining summer snow patches.

Precipitation is expected to cease by 3 PM, with conditions improving to partly cloudy and then clear skies. Winds will also subside, and visibility should recover. However, the morning's chill and wet underfoot conditions will persist. Mount Rausu is brown bear habitat, so carrying a bear canister and practicing proper bear safety is crucial. Morning ascents are not recommended; consider waiting for afternoon improvements or revising your plans.