Scan the entire sky. In certain years the Leonids sported thousands of meteors per hour rather than tens. One of the most important factors is the density of the dust in the meteor stream. The clump orbits the sun in the same way the parent comet does. They are not dangerous to anything on the ground.
Space dust is very fragile stuff.
No Leonid meteors would ever make it to the ground. However, even something the size of a fleck of paint travelling 70 kilometers per second can be dangerous in space. Thus, some scientists are concerned that the meteoroids might harm satellites orbiting the Earth. It remains to be seen whether this will be true or not. By analyzing data from past Leonid showers, scientists believe they know the size and orbit of the greatest density of the meteor stream.