Exploring the Weather Patterns SimulationExploring the Weather Patterns Simulation Water Cycle in the Sim Launch the Weather Patterns Simulation. Go to Regional Weather 1 mode. Use the Sim to investigate how the amount of surface water can affect the amount of water vapor in the air. In Build, set the level of surface water. Decide on a level of sunlight (this should stay the same for both test 1 and 2). Switch to Run, press Pause when the temperature turns red. Record the amount of water vapor at that moment. (If needed, go to Analyze and use the time slider to rewind the Sim.) Repeat with a different amount of surface water.