Dynamic weather simulation: Temperature, humidity, pressure, and wind modeled on a terrain grid.
Controls: Select a tool above, then click/drag on the map. Heat/Cool change temperature. Water adds humidity. Raise/Lower adjust terrain.
Simulation: Wind flows from high to low pressure. Clouds form where humidity is high and move with wind. Rain falls from saturated clouds onto the terrain.
Visualization: Red/blue = temperature, brightness = humidity, arrows = wind. Watch the day/night cycle change temperatures!