Water evaporating from the sea rises into the atmosphere and condenses back into clouds. As these clouds move from being over a cool ocean to warm land the cloud becomes unstable and releases its water content in the form of either Rain, Hail or Snow.
When you have a large body of water (picking something entirely at random, lets say the Atlantic), and it hasn’t met any land for a long time it’s likely to have built up into quite large clouds.
So with this knowledge, why did I come to Galway, about the most westerly city in Europe (ignoring Iceland as its so much closer to North America there isn’t nearly as much ocean) without either a rain coat or an umbrella.
In the space of 5 minutes it went from clear blue sky to torrential downpour (the only saving grace being the conveniently positioned bus shelter and the sense as I walked past it to look up and think, this probably isn’t just a few spots).
And it keeps happening. In the less than five hours I’ve been in Galway I’ve had to dive for cover from half a dozen hefty showers, and delayed leaving the hotel because it was coming down so heavily that I could barely see the other side of the car park.
Still it is my own fault; I did know it would probably be a little damp...