Once you discover 100% of an area, creatures that occur in those subareas are listed when you click on a subarea's name or on a passages symbol that leads to this subarea. Creatures for which the Bestiary entry has not yet been unlocked are displayed as a silhouette. In addition, you will also be notified whenever a raid is about to take place in that area within the next hour.
source: https://tibia.fandom.com/wiki/Measuring_Tibia_Quest
From my own experience - yes it works exactly this way. Please, correct me if I am wrong, but as I remember 1 hour before we get an announcement on which area raid will take place (in our case - Vandura) and 30 minutes before announcement there is an info about exact subarea, so there is a sign exactly on Kharos. Then we can be sure, that Ferumbras is coming to take his revenge! :D
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