Abstract
A high altitude aerial photographic cloud observation was made over the Japan Sea on January 20, 1965 when a comparatively weak monsoon covered the Japan Sea and her neigh-bourhood. Remarkable facts are that the cloud amount was closely related to the sea surface temperature, that the cloud height was almost uniformly about 2km which coincides with the height of inversion observed downstream and that the size of convection system was also uniform.
Some quantitative discussions are tried on vapor, condensed water and heat budget under steady state assumption.
