Shock at the volume of rain
MANY of those who witnessed the downpour have spoken of their shock at the volume of rain – proclaiming they had "never seen anything like it".
So what did cause such freak – and localised – extreme weather conditions?
The two most crucial ingredients were the humid, moist air that had settled over the UK and the cold front which swept in to meet it.
The injection of the cooler air causes the warm air to rise rapidly, forming cumulonimbus clouds – which are very dense and usually associated with thunderstorms – at around 30,000ft.
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The weather was so localised, as thunderstorms tend to travel in the direction in which wind at three km high – or steering wind – is blowing.
The air can't rise enough to form thunderstorms everywhere, so you often find that there are places that see little or no rain and, sometimes, even sunshine!