Thread: What when why?

I have noticed that since it has got real hot weather 95° that early in the mornings around 5:30 am I am getting these pictures on my 899 sonar. The settings are and remain the same and then later when the sun comes up good the pictures clear up and look completely different. What is this is this what they call the lake turn over? When is this just in the hot summer or will it also happen in the winter? and Why is this? Has anyone else seen this happen? The first 4 pictures are early in the morning and the others are later after sun has been up a couple of hours. Like I said the settings has not been changed or moved?????