A tropical cumulonimbus cloud over the Malayan Peninsula was studied by means of the stereophotogrammetry. After three dimensional analysis of the cloud, the following results were obtained : 1) Intermittent updrafts in Cb clouds developed into a petal like form and a hole was observed at the top. 2) An anticyclonical sucking action by the cumulonimbus cloud was observed at an altitude of 4 to 5km, that is, just above the level of low cumulus cloud.
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