霧雨と湿潤な沢筋。額平川コースは渡渉に警戒

Mount Poroshiri summit currently experiences light rain with a felt temperature of 4.8 degrees Celsius. A significant temperature difference of 11.6 degrees exists between the summit and the base, indicating consistently cold conditions at higher elevations. Persistent mist and light rain are expected throughout the day, with a high chance of precipitation, up to 96 percent, until around 3 PM. The ground will remain wet to muddy. Travelers on the Nukabira River course, which involves over 20 river crossings, must exercise extreme caution due to the risk of rapid water level increases. Afternoon rainfall could make river crossings impassable; attempting unsafe crossings is strictly prohibited.

Visibility is currently poor at 1.1 kilometers and is not expected to improve significantly during the day. Navigating in dense fog increases the risk of getting lost. The felt temperature around the summit will hover between 5 and 9 degrees Celsius throughout the day, but with 99 percent humidity and continuous mist, there is a very high risk of hypothermia if exposed. Essential layering includes a moisture-wicking base layer, a fleece mid-layer, and a waterproof-breathable outer shell. Waterproof gloves and a hat are also necessary, along with spare warm clothing.

Light mist will continue after 6 PM, with precipitation expected to cease overnight. However, temperatures will drop further, reaching 3.6 degrees Celsius by 3 AM tomorrow. A headlamp is essential for extended activities. This area is known for high bear density, and solo travel in poor visibility carries significant risks. Group travel is strongly recommended.