Thermal analysis of cumulus clouds produced by mountain fire in Hofu city, Yamaguchi prefecture

Cumulus clouds formed by a hill fire at Mt. Nishime in Hofu City were observed with the use of photogrammetric method and some analyses of their growth characteristics were done with the theory of "thermal". It results that growth characteristics of present "artificial" thermal is much similar to thermals observed both in the atmosphere and in the laboratory experiments. Because of unusual dry air layer of 8% relative humidity at 700mb level, present thermals cannot develop over the height of 2500 meter and