Worst rain I ever saw was in a dessert of all places. It was Jordan in 1996. We were driving a Discovery and the rain was so heavy you could not see anything. I was the passenger and had to open the door and kneel in the foot well looking down to see the edge of the road so we could pull over without droping off the elevated road.
Worst cloud I was ever in (or more accurately underneath) was like that.
The only way you could tell whether you were moving or not was to touch the ground with your skistick and see whether your shoulder moved.
You couldn't see a 12in drop until your ski went over it.
I saw someone stop and then fall sideways until the only thing you could see was the bottom of her skis: she couldn't see the very large hole she had skiied into.
Strangely, poles marking the edge of the piste were visible 100m away.
In 1971, I was a passenger on the RHMS "Britanis" on her Northbound voyage from Oz to the UK.
Chandris lines were a little parsimonious, & most of our stops in ports were quite short, so the long haul across the Pacific to the Panama Canal got a bit tiresome.
To brighten things up, they had "The Captain's Cocktail Party", so all the ladies went to the hairdresser, as part of "dolling themselves up".
It was quite a young demographic, & the '70s, so the hairstyles were quite elaborate.
They couldn't do much without wrecking their hair, so many of them filled in the time till the party, lazing on the sundeck.
As we sailed through the millpond like sea, with blue sky as far as the eye could see, I noticed a small, grey cloud.
Our path intersected that of the cloud, & when it was just over us, the sky opened with rain.
Rain! ---My God!, what rain!
The very large gutters on the sundeck were totally overwhelmed in the few minutes before we sailed out from under the cloud, but getting a bit (a lot) wet wasn't what bothered all the ladies.
It was those fancy hairstyles, which were totally demolished.
The hairdresser had his work cut out fixing that, & the girls spent the rest of the day inside.
He did a terrific job, & they all looked great-----us "blokes" just looked like "blokes"!
At least it was a bit of excitement.