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Hi Olaf and Michael,
This kind of superior mirage (fata morgana) can be seen when warm air lies
above cold air (opposite what Michael explained). There is often a very
strong inversio layer between cold and warm air. What Michael explained
causes those "water on the road" -mirages. You can see that kind of
mirages
in northern regions when warm air is over water or ice which is still
cold.
Here in Finland we can see similar mirages in spring time over sea or
lakes
when water is still cold and warm air is coming from sun heated land
areas.
Temperature difference between cold air layer and warm air layer must be
over 12°C for decent effect.
Here is one of my photos from similar mirage (sorry, this is a small one):
http://www.netppl.fi/~jarmom/i_halo/mirage.jpg
It was the first warm day of the summer but the water was still cold.
Jarmo
> Olaf,
>
> Those maybe the islands you are talking about.
> The type of mirage you seen is when a distant
> object is reflected off a layer of cold air that
> lies above the warm air. Sometimes things like
> mountains ships may be mistaked as a UFO or some
> unknown sea creature. I have not see that type of
> mirage but I have seen the type that looks like
> water on the road on a hot day.
>
> Best,
> Michael
>
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