In Japan, there are three famous local high winds, called “Kiyokawa-dashi”, “Hiroto-kaze” and “Yamaji-kaze”. They are mechanically induced local high winds due to the topography. Last two winds are known as “downslope-wind” caused by upwind high mountains. In the present study, “Hiroto-kaze” and “Yamaji-kaze” were analyzed based on in-situ measurements including mountain-top data. It is found that typical downslope wind appears as “step-wise” time series, which suggests a critical meteorological condition. During the local high winds, potential temperatures of foot and top of the mountain shows almost same values, which supports the downslope-wind. Local surface pressure depression at the foot of the mountain was observed, which suggests the hydraulic jump.
