"Probable" means likely or reasonably likely to occur, as in "a reasonable probability of more than a moderate effect on the quality of the environment" (see WAC 197-11-794). Probable is used to distinguish likely impacts from those that merely have a possibility of occurring, but are remote or speculative. This is not meant as a strict statistical probability test.
Wash. Admin. Code § 197-11-782
Statutory Authority: RCW 43.21C.110. 84-05-020 (Order DE 83-39), § 197-11-782, filed 2/10/84, effective 4/4/84.