Arcus cloud - 19.8.2016 at 19.00 - 19.8.2016 at 20.20 Mustasaari
Observation number 56043
The thunder front passed 20 miles away, but it blew a dry avalanche cloud to the side. li high contrast to the completely calm weather as a gust of wind from the avalanche rumbled around the road.
Here's a 12.5x timelaps video from a tidal cloud. At the end I think it will be the beginning of the tornado;)