Abstract
The area between from the Osaka Plain to the Ikoma Mountains faces sea at only west direction and is surrounded by mountains at the other directions. Then, rain clouds can directly encounter the Ikoma Mountains only from west direction before crossing any mountains. On the other hand, rain clouds cannot encounter the Ikoma Mountains from the other directions before crossing surrounding mountains. Only when rain clouds migrated from west direction, amounts of precipitation in the Ikoma Mountains were observed to be 41 % higher than in the Osaka Plain. The altitude difference between both areas is about 400 m. When rainclouds migrated from the other directions, both amounts of precipitation for the Ikoma Mountains and the Osaka plain were almost the same. Therefore, altitude effect of amounts of precipitation for foot of mountain and top of mountain was observed only when rain clouds directly encountered the mountain before crossing the other mountains.
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