Some economic aspects of weather modification

In considering the modification of weather, two obvious but easily under emphasized, necessities are (1) to set forth clearly and completely the nature of the need that is being filled and (2) to align planning with forecasting. An illustration is given of situations which augmentation of rainfall would and would not be prudent. Another shows that actually controlling the weather would differ in utility from merely precipitating a larger fraction of water from clouds than nature would.