How to judge weather system by isobaric gradient force

Judging the weather conditions of each pressure field in the weather system according to the near-surface isobar

(1) High pressure center: the center pressure is high and the surrounding pressure is low.

(2) Low pressure center: the center pressure is low and the surrounding pressure is high.

(3) High pressure ridge: the part where the isobar protrudes outward from the high pressure center.

(4) Low pressure trough: the part where the isobar protrudes outward from the low pressure center.