California's drought has state officials worried, and sending scientists into the clouds.  

Pilots at Weather Modification are using a new technology, involving airplanes and clouds, in the hopes of increasing rainfall and restoring the state's water supply.  

In a process known as "seeding," a pilot will circle a cloud until temperatures are cold enough, and then release silver iodide.  

The water in the cloud attaches itself to the silver iodide, and falls to the ground as a snow flake.  

The pilots are concentrating on the Sierra Mountains, and the seeding is meant to help increase snowfall, with the eventual goal of filling the reservoirs below with more water.