Measurement of surface rainfall rates from test clouds when convenient and the collection of daily precipitation amounts by a network of volunteers. Experiment Procedure Seeding experiments should be carried out whenever isolated cumulus clouds or cumulus clouds embedded in a stratus cloud deck occur in the project area and when the research aircraft and a seeding aircraft are available. Potential test clouds are to be chosen by the aircraft mission scientist. The seeding aircraft will follow the same heading. Clouds are accepted for the experiment based on measurements during the first penetration.
Some allowance is made for real time rejection of artifacts.
FSSP calculated LWC can be used in lieu of JW measurement. The vertical velocity must exceed 0 m s-1 for five continuous seconds. Otherwise, the cloud is rejected. If a cloud fails marginally on the first pass, it may be re-tested on a second pass. If the cloud is accepted, the aircraft mission scientist will instruct the crew of the seeding aircraft to apply the appropriate treatment on their penetration of the test cloud.