With the dark clouds moving in, rain seems more like a 'probability' than a possibility.
The 'probability' of a coin coming up heads is one out of every two tries.
The 'probability' [='likelihood'] of an earthquake is low/high.
(..) And nobody believed her. Not even me. We gotta get her out of there. - Negative. The T-'s highest probability for success will be to copy her and wait for you to make contact. Great. What happens to her? The subject being copied is terminated. (..)1991 Terminator 2: Judgment Day