The problem with explaining chance of rain is that it’s subjective. Of course, every weather forecast is subjective based on the forecaster’s ability, knowledge, and interpretation of data and model information. But chance of rain is also subjective in that it’s used differently in different parts of the country, at different TV stations, and sometimes even among the meteorologists at one TV station.
If you are under the storm over Zellwood/Eustis/Tavares, you are receiving a 100% chance of rain (and it’s a downpour accompanied by lightning!). Everybody else who isn’t getting rain has a 0% chance of rain. See how it gets kind of tricky?