Original: An average of 86 tropical cyclones of tropical storm intensity form annually worldwide, with 47 reaching hurricane/typhoon strength, and 20 becoming intense tropical cyclones (at least Category 3 intensity on the Saffir-Simpson Hurricane Scale).
Simplified: Usually, about 86 tropical cyclones of tropical storm strength form worldwide every year, with 47 reaching hurricane/typhoon strength, and 20 becoming strong tropical cyclones (at least Category 3 intensity on the Saffir-Simpson Hurricane Scale).