When cold air replaces warm air it is called a Cold Front, and when warm air replaces cold air, a Warm Front.
Xa umoya obandayo uthatha indawo yomoya oshushu ibizwa ngokuba yingqimba yomoya obandayo, kwaye xa umoya oshushu uthatha indawo yomoya obandayo, ingqimbo zomoya oshushu.