[matt]

OK....I'll kick this off...but I'll only get the list started...others can/will chime in with the extra bits and pieces.

First of all, we're talking about seeing, as opposed to transparency. Seeing is about the prevailing atmospheric conditions as opposed to cloud/smog/fog/dew etc which is transparency.

So...for good seeing, it usually accompanies a high pressure system and airflow at varying altitudes moving in pretty much the same direction at comparatively low speeds.

Also, study the effects of laminar airflow over even terrain, rather than being on the receiving end of airflow which is 'falling' on you after rising over a nearby range.