East Coast Australia weather patterns

So I was having a brief discussion with fellow inhabitants of my work place, discussing (very cliche) the weather. On the east coast of Australia, during summer, there is a distinct pattern to rain fall that holds during most years; ie: it will storm ~25% of days on the afternoon, at or just after 5pm.
(Citation needed)

It occurred to me that at 5pm, or just before for lucky government workers, most wage slaves exit their air-conditioned office spaces and venture out into the 80+% humidity and 30 something Celsius that passes for ambient conditions. Whereupon they will exude about 500ml of salty water.

A lot of this water will evaporate, either directly, or after it has soaked into clothing which will provide a larger surface area aiding the evaporation. In a city like Brisbane, where there are 1million inhabitant, that is not an insignificant amount of water vapour. Assuming the CBD working population is say 100,000, this is then 50,000L.

Added to the existing high humidity, this will result in localised zones of super saturation, resulting in cloud formations, and (due to the inevitable atmospheric agitation of 250,000 people trying to get home to watch crap on the TV) will result in typical vertical thunderstorm clouds.

It seems obvious to me therefor to blame (or attribute) regular summer storms on the east coast of Australia on western civilization's work habits.