1) Relatively laminar flows on the windward side became turbulent when the flows past the mountain ridge.
2) Precipitation enhancement in the radar reflectivity was observed on the windward slope and the turbulence area adjacent to the ridge on the leeward slope.
3) An acceleration of the horizontal wind speed and a hydraulic jump-like feature associated on the lee side were shown.
4) PPI scans from the lee- side radar revealed the presence of an unsteady separated wake in which vortex shedding occurred.
5) The behavior of echo cells was qualitatively consistent with the upstream Froude number (Fr) effect: When Fr was relatively large, echo pattern suggests that the air parcel flow almost directly across the mountain ridge, while cells flow around the summit in the case when Fr was small.