Abstract: An installation intended to cause precipitation at a site includes a lance for spraying water into the air using a pump that is controlled by a timer. A lightning conductor is erected at the site for protecting the timer and pump from lightning, as well as protecting a tank containing water to be sprayed which is also at the site. A probe for sensing atmospheric conditions that are conducive to rain is also provide at the site. The timer and the probe are controlled by a remotely located computer which, upon information received from the probe, activates the timer which in turn activates the pump.