Cruising through an Arcus - Morning Glory Roll Cloud in the Baltic Sea

While Cruising in the Baltic sea we encountered with a rare phenomenon called Arcus Rolling type Cloud, also known in Australia as the "Morning Glory".

From WIKIPEDIA :
A roll cloud (Cloud Atlas name Volutus) is a low, horizontal, tube-shaped, and relatively rare type of arcus cloud. They differ from shelf clouds by being completely detached from other cloud features. Roll clouds usually appear to be "rolling" about a horizontal axis. They are a solitary wave called a soliton, which is a wave that has a single crest and moves without changing speed or shape.
One of the most famous frequent occurrences is the Morning Glory cloud in Queensland, Australia, which can occur up to four out of ten days in October.
One of the main causes of the Morning Glory cloud is the mesoscale circulation associated with sea breezes that develop over the Cape York Peninsula and the Gulf of Carpentaria. However, similar features can be created by downdrafts from thunderstorms and are not exclusively associated with coastal regions.
Coastal roll clouds have been seen in many places, including California, the English Channel, Shetland Islands, the North Sea coast, coastal regions of Australia, and Nome, Alaska.
(wikipedia.org/wiki/Arcus_cloud#Roll_cloud)