The cause was primarily exceptionally heavy downpour from a storm cell over Llandudno, which spewed roughly 4.5" of water in two hours and poor design of the Marine Drive around the Orme, which had no storm drain-type gaps to allow exceptional rainfall to pour through and into the sea. I was hit just as I attempted to drive up to a friend's place on Llys Helig and the road was simply funnelling immense quantities of water along with a lot of debris into Llandudno. There was a fire engine, with the water rising steadily above its wheel arches, with the fire crew sitting on the top parked at the Paddling pool, where a pumping station had apparently succumbed to the water inflow. I'd also had to rescue my wife who'd been in a hairdresser's in Garden St, where the water had risen up the glass door, exerting so much pressure on it that the door couldn't be opened until a fireman, armed with an axe, opted for the easy option. Certainly sticks in the memory.