 There are several varying types of ‘‘bores’’ in different layers of the atmosphere, such as the mesospheric bore which occurs in the mesosphere.Rare but not unknown in a great many locations, the waves appear with some predictability and regularity in the Gulf of Carpentaria during Spring.They have been seen as frequently as six days in a row according to reports by the two pilots who have most experience with 
soaring these sometimes enormous examples of the undular bore, known in Australia as the Morning Glory cloud.