The info in forecasts?

[turboscrew]

Does someone know what do the seeing indices mean in the Meteoblue forecasts?
I've seen the index 1 ranging from 1 to 5, but the index 2 has been above 2 only when the sky is fully clouded.

Now it looks like this:

Like in the midnight, the arc seconds is 1.00, but the seeing indices are 2 and 1.

Also, the Clear Outside forecast shows now data from 7timer.info.
What is the lifted index? And what kind of effect can that cause?
The Clear Outside forecast looks like this.

[GCoyote]

Good question. At first I thought it was related to turbulence from high Jet Steam velocities but there is more to it than that.

[Ruud]

Don't know, but I thought it was visual vs photographic. One would very rapid vibration on a small scale, the other more like things bobbing up and down, like boats on water. The latter does not hinder visual observation much. Both are bad for long exposure photography.

Meteblue says about seeing "The estimated seeing indexes (1 & 2) range from 1 (poor) to 5 (excellent) seeing conditions. These values are computed based on the integration of turbulent layers in the atmosphere." This is why I think both numbers account for the entire air column and describe a different kind of effect on the image quality.

Actually, I'm pretty sure Meteoblue respond to just about any question. I'll send them a link to this thread and ask them if they can help us.

[turboscrew]

Don't know, but I thought it was visual vs photographic. One would very rapid vibration on a small scale, the other more like things bobbing up and down, like boats on water. The latter does not hinder visual observation much. Both are bad for long exposure photography.

Meteblue says about seeing "The estimated seeing indexes (1 & 2) range from 1 (poor) to 5 (excellent) seeing conditions. These values are computed based on the integration of turbulent layers in the atmosphere." This is why I think both numbers account for the entire air column and describe a different kind of effect on the image quality.

Actually, I'm pretty sure Meteoblue respond to just about any question. I'll send them a link to this thread and ask them if they can help us.

Good idea.
It also looks like this has been added when I wasn't looking: "Seeing 2 gives more weight to the effect of density fluctuations, and is more likely to indicate air "flickering" due to turbulence."

It's still unclear what is included in the indices.