Most of the rainfall experienced is of the convectional type. Rainfall comes mostly from convectional thunderstorms originating above Lake Malawi. Most rain comes from convectional thunderstorms originating over Lake Malawi. U.P. The type of rainfall that U.P. receives is orographic, cyclonic and convectional. On September 28, an area of convectional cloudiness formed to the northeast of Pohnpei. Convectional sludge incineration systems mostly charge dewatered sludge directly into the incinerator. It includes both the convectional mass flux and the diffusional mass flux. Convectional cloudiness persisted over the Philippines, contributing to bring heavy rainfall on August 25. Convectional winds also increased and the fire front started up the drainage heading east. Rainfall in summer is convectional, while relief rainfall dominates in the winter.