As the atmosphere of the planet is warming up, (and there is no doubt that it is warming up) so the air can hold more water vapour. Although we do not understand the processes completely, it is becoming clear that more water vapour in the atmosphere will mean more rain clouds and it seems likely that in certain parts of the world we will be experiencing harder and more violent downpours.
According to one group of researchers at Oxford University who ran computer models of the atmosphere with and without the excess carbon dioxide that humans have put into the air, the probability of floods in England and Wales has increased with increased atmospheric emissions, making severe future flooding more likely.
Computer modelling of climate even in relatively small areas of the surface of the world like England and Wales is far from an exact science. There are two major variables about which we understand little. One variable is the formation of clouds and the other variable is the worldwide oscillations of pressure and weather systems. This makes prediction even based on sophisticated computer modelling using robust data very difficult.
The UK government will be spending much more money on flood protection than it has previously over the next few decades, but there is a limit to how much can be protected by trying to retrofit flood protection. It is far better to design new buildings with built in flood protection. We should not build on flood plains and we should design buildings so that they do not site in the way of likely areas of flooding.
Between 1950 and 2000 there has been an increase in the frequency of exceptionally heavy rainfall in the Northern Hemisphere. According to Canadian and British scientists the only explanation for such increased heavy rainfall frequency is the slow increase in atmospheric warming over that period. The researchers seem to have linked in fact what climate change scientists have postulated over the years; that increasing human emissions have made the air warmer, and that warmer air holds more moisture which ends up being released in heavy rainfall.
Yes, wherever you have been and where ever you are a hard rain is going to fall.