On the Behavior of Long-lasting Cellular Echoes

Abstract

Behaviors of two long-lasting cellular echoes, which were found out among several tens of cellular echoes near Owase Meteorological Station on the 14th of September in 1972, are analysed in detail using photographs of PPI radar echoes taken every 3 minutes. Both echoes landed at the nearly same point with the speed of travelling which became slower and slower with approaching the land.
It is found out that long-lasting echo formed in a cluster of cellular echoes which had appeared over the sea about 100km east-south-eastward from Owase. Though new echoes had a tendency to form in the back region of old echoes in initial stage of the cluster, they appeared in the fore region of echoes existing previously after the formation of the longlasting echo. On the basis of the results of analyses the mechanism of formation of organized precipitating convective clouds will be discussed.