Scud clouds before a thunderstorm, scud clouds are moisture that is being absorbed by an updraft, which then condenses and forms clouds
Behind this building is a lake, it is one of the sources of moisture for this updraft, the other source is the high relative humidity that was already present in the air, wispy and ragged clouds in the middle, and a funnel-cloud-like cloud near the middle, which is also a scud cloud.
<a href="//commons.wikimedia.org/wiki/User:Couch-scratching-cats" class="mw-redirect" title="User:Couch-scratching-cats">Rollcloud</a>
Attribution
<span class="int-own-work" lang="en">Own work</span>