The scientific response to this would be that water vapor condenses as it moves higher, where the atmosphere is colder, keeping this in mind, it should help to explain why rain forms more over West Farris rather than East Ferris.
Warmer air carried more moisture, and when forced upwards in elevation, the temperature drops, then allowing more rainfall to precipitate out
The Counting Principle states that the number of possible outcomes is equal to the product of the number of outcomes for each event. In this case, (M)(N)(O).
