視界不良の山頂。午後は雨具必携

Currently, Tomamu Summit is cloudy with visibility under 1km due to fog. There is a temperature difference of approximately 4 degrees Celsius between the summit and the base. The summit is at 10.8°C, feeling like 9.5°C. Cloudy conditions are expected to persist throughout the day, with temperatures rising to around 14°C, but no significant improvement in visibility is anticipated, making views from the Unkai Terrace unlikely.

Ground conditions are presumed to be wet due to the temperature and humidity. There is no precipitation at present, but the humid air will keep surfaces damp. After 15:00, wind speeds will increase to 4.75 m/s with gusts up to 11.1 m/s, and light rain is forecast to begin around 18:00, becoming heavier overnight.

For activity, waterproof and breathable outer layers are essential. Even with gondola access, be prepared for wind chill and rain near the summit. A quick-drying base layer and a thin fleece or synthetic insulation jacket for a mid-layer are recommended for adjustable layering. Crampons or microspikes are not needed as there is no snow.

Wind risk is moderate with gusts up to 11.1 m/s during the day, which should not significantly impede movement. However, rain will further lower the perceived temperature, potentially dropping to the single digits by 15:00, making it crucial to stay dry. The risk of hypothermia is low as long as temperatures remain in the upper 10s and it is not raining, but it will increase after 18:00 with the onset of rain and falling nighttime temperatures. Avoid prolonged stops if wet. While entry to off-piste areas like North Burn and Riverside is not a concern without snow, poor visibility always poses a risk of misjudging terrain. Today, considering the limited visibility and afternoon rain, an early start and early finish are advisable.