額平川増水注意。午後雷雨に警戒。

Mount Poroshiri will experience continuous rain today. As of 7 AM, the summit is 11.8°C with light rain, while the base is 22.2°C with light drizzle. The temperature difference of over 10°C between the summit and base means the summit area will feel chilly. Drizzle will persist throughout the day, with thunderstorms forecasted for 3 PM, carrying a 100% chance of precipitation. Strict caution against lightning is necessary for afternoon activities.

The river crossings on the Ekihiragawa course are prone to swelling due to continuous rainfall. With thunderstorms expected in the afternoon, the risk of rapid river swelling making crossings impossible becomes very high. Absolutely avoid attempting dangerous crossings. The ground will be generally wet and muddy, and visibility is poor at 1.8km, requiring extreme caution during movement.

The apparent temperature will be around 11-12°C during the day, but being wet from rain and wind significantly increases the risk of hypothermia. A quick-drying base layer, an insulating mid-layer such as fleece, and full waterproof rain gear are essential. Strongly recommend canceling afternoon activities due to the forecasted thunderstorms. Precipitation will weaken in the evening, but temperatures will remain in the low 10s°C.