雨と霧で視界不良。濡れた岩稜は滑りやすい。

As of 7:45 AM, the summit of Mt. Tateyama (Oyama) is experiencing rain with an air temperature of 7.1°C, feeling like 4.8°C. Visibility is very poor at 1.5km. Rain is expected to continue throughout the day, easing to light rain in the afternoon, but temperatures will hover around 5°C, making the perceived temperature even colder. With persistent rain and wind, the risk of hypothermia is extremely high in this 3000-meter class mountain environment.

The trails will remain wet all day. The route from Ichinokoshi to Oyama summit, in particular, features continuous rocky ridges, and rain-soaked rocks are extremely slippery. In addition to the usual risk of rockfall, there is an increased danger of falls and slips. Muddy sections will also be prevalent, making footing consistently unstable. If you choose to proceed, full waterproof and breathable rain gear, including jacket and pants, is essential. Layering should include a base layer, a mid-layer like fleece, and an insulating outer layer such as synthetic down or PrimaLoft, along with waterproof gloves. Crampons or microspikes are not necessary.

Today, wind gusts are forecast to exceed 17m/s at times, further lowering the perceived temperature due to rain and wind. Visibility of 1.5km means near whiteout conditions on the ridge, increasing the risk of getting lost. Engaging in activity under these conditions directly leads to hypothermia and accidents. Although no significant alerts have been issued, prioritizing safety and considering canceling your plans is advisable for today's conditions.

Light rain and drizzle will continue intermittently into the evening, with temperatures remaining in the 5-6°C range. The cold will persist overnight, so ensure adequate cold weather protection even if you are staying overnight.