Rainmakers: Inside the Great Hall of the People in Beijing, senior officials of China's National Development and Reform Commission and its State Environmental Protection Administration meet the press to discuss issues of environment, resources, energy, and emission control (top). Below, one member of China's army of part-time rainmakers mans an anti-aircraft gun to show the international media how he will shoot silver iodide into passing clouds.
First, Beijing's Weather Modification Office will track the region's weather via satellites, planes, radar, and an IBM p575 supercomputer, purchased from Big Blue last year, that executes 9.8 trillion floating point operations per second. It models an area of 44,000 square kilometers (17,000 square miles) accurately enough to generate hourly forecasts for each kilometer.
Then, using their two aircraft and an array of twenty artillery and rocket-launch sites around Beijing, the city's weather engineers will shoot and spray silver iodide and dry ice into incoming clouds that are still far enough away that their rain can be flushed out before they reach the stadium.
Finally, any rain-heavy clouds that near the Olympic stadium will be seeded with chemicals to shrink droplets so that rain won't fall until those clouds have passed over.