Freshwater lake in Central Florida during the rain this always happens. As far as I can tell the surface doesn’t look oily but storm drains do run off into the lake. Once the storm passes the surface of the lake returns to normal.
I can’t post a picture with my post so all include an example in the comments.
In: Other
[Wavy lines](https://imgur.com/gallery/AxAf2B2)
Wind. As the wind blows across the surface of the lake, it transfers energy to the surface of the lake, which in turn forms all different forms of waves on the surface of the lake. Adding rain or other precipitation affects this even more.
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