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What is convergence?
It is basically the meeting of two winds of different directions. Normally, providing that the air masses in each wind direction are different, one will ride up over the other, thus creating lift. However, if both winds are the same in temperature and density, then they will both ride up together, also creating an area of lift. In convergence zones, the thermals are generally more concentrated and are often stronger because the air around is already going up.
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