Abstract
An attempt was made to find, by aerial photographic observation, a feature of the cloud distribution over the Japan Sea during an outburst of the continental polar air in winter. Oblique and vertical aerial photographs were taken from an aircraft flying at a level of about 6 km above sea level.
The clouds o b served are of the type of cumuli topped by an inversion layer, the base of which ranges from 2 to 3 km. Many of the cumulus clouds are aligned in bands stretching toward the downstream of mean wind with a spacing of about 20 km between the axis of one band and the next. Furthermore each band is not a simple and uniform streak but has undulations of a wavelength of 30 km. The band structure of clouds analyzed by aerial photogrammetry is verified by radar observations.
