Areas where the pressure is above the mean are termed 'High Pressure Systems' and those below 'Low Pressure Systems'.
Iindawo apho uxinzelelo lungaphezulu kwesiphakathi zibizwa ngokuba `zizixokelelwano ezinoxinzelelo oluphakamileyo' kwaye ezo zingaphantsi okanye zingezantsi `zizixokelelwano ezinoxinzelelo olusezantsi'.