A warm front that is detached from a depression's cold front and partially encircles the low-pressure core. During cyclogenesis the original frontal zone may fracture near the centre of the depression into two separate zones with strong thermal gradients. The cold front advances eastwards, and the warm front develops westwards. The system appears, superficially, like the form more conventionally described as a back-bent occlusion, but observations suggest that the revised model more satisfactorily accounts for features found in many depressions.
Subjects: Meteorology and Climatology.