thunderstandable

Used to describe an action or idea which is within the realm of reason, given the deafeningly-noisy storm that was raging at the time.

Motorist: I would have stopped for you earlier, Pal, but I never heard you till just now --- this storm drowned out your horn till you got closer behind me.
Motorist's buddy, who had been honking for him to pull over so that he could tell him something: That's thunderstandable --- I'd figgered as much.