The silver iodide cannon is used to control the weather. It has a built-in light sensor to determine the current weather and if set to do so, will fire the appropriate chemicals into the air to alter it. Note that it has a cooldown time, and must have a clear view of the sky.
Required Power: 32768W
Power Input: Bottom
Rain: Silver Iodide
Thunder: Redstone+Silver Iodide
Superstorm: Glowstone Dust+Redstone+Silver Iodide