This is weather simulation! Use the left and right arrow keys to increase or decrease the humidity (how much water is in the air), the up and down arrow keys to increase or decrease the temperature! Use the key A or S to increase or decrease the windspeed! There is rain, snow, hail, angled rain, and even damage to the house and tree! If the conditions are right, a tornado could form... To create a tornado you need: -A windspeed of at least 64 miles per hour.. -A temperature greater 10, but less than 20.degrees Celsius. -and a humidity of at least 90. You can classify the tornado by surveying the damage it does!