The present author pointed out that there is a marked descending motion in the rear of a typhoon at a distance of 100_??_200km from the centre of the typhoon. The type of the descending motion is quite different from the phenomena of the “eye” of storms. The existence of such descending motion in the field of tropical cyclones, even in the field of fully developed extra-tropical cyclones, would be quite interesting in the field of dynamic meteorology. This foehn effect (free foehn) may be explained as an isallobaric divergent motion due to the isallobaric high in the rear of typhoons.
