We DO NOT get two different effects from the same atmospheric condition! How many times do I have to answer the same objection?
Do you know what a temperature inversion is?
Let me just tell you.
Normally warm air masses want to rise and cold air masses want to sink. A temperature inversion happens when warm air is trapped UNDER cold air.
But warm air is less dense than cold air and so why would it bend light toward the surface, you might ask.
The answer is because temperature is not the only thing that determines the density of air. There is also atmospheric pressure and humidity. Warm air, especially when it happens to be over a relatively warm body of water can hold a great deal more water vapor which is more dense than dryer, colder air above it. This leads to a reasonably stable condition that can persist for some period of time. Conditions, however, have to be just right for the air mass to remain clear. It's easy to create clouds under such conditions and if the lower air mass warms too much, then its extra buoyancy overcomes the other factors and bye bye temperature inversion.
If you want to understand the topic there are plenty of places to go that have NOTHING at all to do with whether the Earth is flat.
Mirages in Finland
What doesn't fit with Flat Earth Theory is the fact that we cannot typically see across a 50 mile stretch of the Earth, which we should easily be able to do on a regular basis. What you say isn't the issue to you is the exact thing that should be the issue! Have you ever heard the saying, "The exception proves the rule."? Most people who have heard it don't understand what it means. They think it some sort of logical fallacy because counter examples would normal disprove something, not prove it. But that isn't what it means. It means that you ought not treat an exception to the norm as if it was the norm, which is exactly what the line of thinking you presented above does.
If the rare occurrence of the ability to see 50 miles across a lake is proof that the Earth is flat, then what does the normal every day occurrence of only being able to see 3-4 miles prove?
Clete