1. Sudden increase of nocturnal temperature on the northern slope of Ocho valley.
During a clear night, the temperature shows sudden increase periodically at the middle of the slope, while at the top and foot of the slope, the temperature is lower and does not show any periodicity.
2. Relation between the sudden increase of nocturnal temperature and the dimension of Basin.
Such sudden increase of night temperature can be observed at Inawashiro (located at the foot of Mt. Bandai, 1819m above msl) and at Funatsu (located at the foot of Mt. Fuji, 3776m above msl). From the data at these stations, it was found that the characters of the beginning and end, the duration, amplitude and slight oscillation of such phenomenon are related to the relative distance from the upper part of the valley to the station, to the areas of lake and land of basin, elevation of the station, and stability.