Why does the horizontal airflow in the weather system diverge clockwise and the central airflow sinks?

(1) The horizontal airflow flows counterclockwise from the periphery to the center, which is a cyclone in the northern hemisphere.

(2) Cyclones in the northern hemisphere rise vertically, which is easy to condense clouds and cause rainfall.

(3) Cyclones develop strongly in tropical oceans and form typhoons.

So the answer is:

(1) northern cyclone

(2) More rain

(3) Typhoon