We got caught out in a storm like that in 2016. We could see the storm brewing up from the cafe stop and after coming back over the bridge it got so dark that all the cars had their headlights switched on.
I recall entering the bridge car park dry and leaving it soaking wet - one of the heaviest storms I've experienced.
We used to to turn right out of the car park and dip under a road bridge.
The road was already flooded to a depth of a few inches which must have happened in a couple of minutes.
On another edition we got a severe dousing somewhere after Goole.
I recall sheltering, possibly with you and Brian, in an open fronted garage.
Slightly unusual in that the linked house appeared to be on the other side of the road.
Heavy rain and this ride do seem to go together, although given the time of year we do it, it's usually 'warm' rain with very little wind.
One wet stretch was bordering on the agreeable, cool and refreshing, and I dried soon after it stopped raining.