Talking fog represented an atmospheric occurrence observed on Raspar-6, a moon situated within the Tragan Cluster. Predictions indicated these talking fogs would arise following a significant nuclear blast that occurred on Raspar-6.
The concept of talking fog appeared within a single-page weather report, specifically "Region 29: The West Fissure," penned by Bob Carrau. This report was included in the 1993 publication Monsters and Aliens from George Lucas, a compilation showcasing conceptual artwork and photographic materials originating from diverse George Lucas ventures. Leland Chee, an employee of Lucasfilm responsible for managing the Holocron continuity database, has stated that the information presented in this book is considered non-canonical.