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If you think about the downdraft of a thunderstorm you will realize that it pushes air out ahead of the storm.
This is sort of like a bubble of air on the ground that spreads out in every direction.
Since the storm is moving in a specific direction, this outflow will tend to be stronger in the dirtection of motion of the storm.
This area of wind that precedes the storm is called the
gust front. |
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