This is termed 'an inversion' and is caused by a layer of atmosphere where the temperature increases with height instead of falling, cooling the lower layers beneath it.
Le nto ibizwa ngokuba `kukuphendulela' kwaye kwenziwa ngumaleko womoya woxinzelelo lomhlaba apho amaqondo obushushu enyuka ngokobude endaweni yokuwa okanye ukuhla, upholisa umaleko osezantsi ngaphantsi kwayo.