This is a complete myth.
The laugh of the kookaburra has nothing to do with weather patterns. The kookaburra's laugh is really a territorial call and a warning to others.
means that rain is coming
Rain is coming.
Rain does not bother kookaburras. Like other birds, they remain on a tree branch.
No, flies biting does not necessarily indicate that rain is coming. Fly behavior is not a reliable indicator of weather patterns. Changes in barometric pressure and other environmental factors are more closely linked to predicting rain.
"Where are you ? .... the rain is coming"
did you see black clouds , that's the sign of rain is coming
You can use the term "torrential rain" to describe rain coming down heavily or in a torrent.
If there is DARK clouds and there is cold air then there is a good chance of rain.
i think they are thinking about it
Not really it just depends, you know its going to rain because you can feel a nice cool breeze but you just have to check the news.
You probably won't be able to. You can identify them as idioms because they won't mean anything in the context in which they are used. You can try to puzzle out the probable meaning, but you'll probably just have to ask someone what they mean. For example, in the sentence, "It was coming on to rain," you might be able to determine that "coming on to" means that rain seemed imminent, but you'd be better off asking to be certain.
the effects were the rain coming from canada