In most cases they don't. In the cases that they do there is
usually severe flooding. There are two possible explanations for
such a scenario. First, thunderstorms move by the wind. If there is
little wind to move the storm, then it will move very little.
Another scenario is called storm training, where thunderstorms line
up and move over the same area one after another, sometimes merging
to form a continuous line of heavy rain.
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In most cases they don't. In the cases that they do there is
usually severe flooding. There are two possible explanations for
such a scenario. First, thunderstorms move by the wind. If there is
little wind to move the storm, then it will move very little.
Another scenario is called storm training, where thunderstorms line
up and move over the same area one after another, sometimes merging
to form a continuous line of heavy rain.