Eli5: What does one mean when talking about a finite probability ?



In a paper I am reading, the author describes “…the drying simulated by the Hadley Centre model as having a finite probability…”
I don’t get what he means, although I have a slight idea. Searching google on my own hasn’t helped tho… anyone ?

Earth science Tag because its in that field although it could also be math.

In: Earth Science

Finite probability space is outcome where you can write down the outcomes (head, tails etc.).

Infinite probability space is something where you cannot do this.