日中霧雨に視界注意。稜線は冷え込む

The Hakuba-dake summit will experience mostly clear conditions this morning, but light drizzle is expected to begin around noon, intensifying to moderate drizzle by 3 PM. While the base shows 15.5℃, the summit temperature will drop from the mid-8s℃ in the morning to the mid-5s℃ in the afternoon. Considering wind gusts up to 9.9m/s by 3 PM, the perceived temperature could fall below freezing, necessitating strict caution against hypothermia. For layering, wear a moisture-wicking base layer, a fleece, and a waterproof-breathable shell, and carry a light down jacket for breaks.

Ground conditions will likely be wet to muddy due to the light precipitation. On the Daisekkei route, if any snow remains, the wet surface from drizzle will be slippery. Given that microspikes are often required even in summer on certain sections, carrying them is highly recommended. Visibility may deteriorate significantly in the afternoon due to the drizzle and potential for dense fog; exercise extreme caution with route finding and ensure you have a map and GPS.

The risk of lightning is low, but hypothermia due to the cooling temperatures and wet conditions is a concern. Maintain hydration and ensure adequate insulation during breaks. It is advisable to conclude your ascent by early afternoon or be prepared for an early retreat given the deteriorating weather and perceived temperature drop.

Overnight, clear skies are expected, but temperatures will fall to around 4℃ with continued winds. If staying overnight, ensure you have sufficient sleeping gear and warm clothing to prevent hypothermia.