What determines how hard it rains?

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Offline chris

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What determines how hard it rains?
« on: 13/08/2012 08:39:08 »
Sometimes a gentle drizzle falls persistently (very UK-esque!); other times the most incredible deluge resembling stair-rods drops from the sky making it sound like someone is rapping on the roof with a hammer.

The raindrop size is clearly very different between the two extremes; so how do these different rain conditions come about?
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