It doesn't take much of a rainstorm to see localized flooding. Some debris over the storm drain is enough to flood a street. Hard to anticipate that happening.
replyDangerous localized flooding has also occurred for other reasons unrelated to weather, like broken dams or embankments.
replyIt can also occur downstream many many miles from the rain - see flash floods in the desert from mountain rains far away - https://www.youtube.com/watch?v=ORJtxkuD62E
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