Suginori Iwasaki
National Defense Academy

We have been carried out observations of jumping cirrus, a cloud which jumps out from the top of cumulonimbus clouds, at the Mt. Fuji weather station. We mainly analyzed the data we had taken in this summer. The data shows a cloud with a width of 1.3 km jumps out 1.2 km from the top and its jumping speed is 7.9 m/s on average. The cirrus then drifts away for 11 min and disappears. The results show a cumulonimbus cloud transports substances such as water vapor above it.