Wall clouds over the Oslo fjord

Oslo has experienced a fair amount of unstable weather for the past month or so. We have had days that start out sunny and warm, then the clouds roll in and darken the sky. Sometimes it rains, other times it doesn't. Sometimes we experience a brief rain shower, other times the rainfall is torrential. When we were sailing back to the harbor on Saturday after a pleasant boat trip on the Oslo fjord, I captured some of the really weird cloud formations that appeared around 6 pm local time. I say weird, because I've never seen anything like these formations before in Oslo. Perhaps they have occurred before and I just haven't seen them. I commented to my husband that one of the formations looked like the clouds you see in the Midwest (USA) when tornadoes form. And then I googled these types of cloud formations (square clouds) and found out that these types of clouds are called 'wall clouds', and sure enough, can be associated with the formation of tornadoes. I often wonder why we don't get more tornadoes in our part of the world. But we have experienced waterspouts; the Oslo fjord experienced a waterspout some years ago (https://norwaytoday.info/news/waterspout-oslo-saturday/) and in 2014 southern Norway experienced the same (https://www.thelocal.no/20140624/mini-tornadoes-stun-southern-norway).

Here are some photos of these weird cloud formations: 

never seen anything like this before

almost looks like a tornado is forming