But even with better data, monsoons are ill-understood once they leave the sea or low-lying land.

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Less serious flood watches, affecting nearly all of England and Wales, indicate that low-lying land and roads could become flooded.

BBC: Parts of UK on flood alert amid heavy rain

Such land is prevalent in low-lying Bangladesh.

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This rugged, remote land was shaped by volcanoes and many of its low-lying islands are ringed by flawless beaches and protected by coral reefs.

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Such land is prevalent in Bangladesh, which has many low-lying, swampy areas.

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As it crossed over land, it began to weaken but still brought torrential rainfall and floods to the low-lying areas.

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