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)
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