THIS is a real rainout!

[Granny Gremlin]

Dad noted that he was able to take a bar of soap and shower in the open during the monsoon storms whilst in Burma in '44, and probably was not joking...

We used to do that at summer camp (Algonquin region, ON, CA).  Once a season there'd be a crazy downpour.

.... but not before the annual mudwrestle  battle royale in front of the boathouse.