Dines' compensation
Dines' compensation, or Dines compensation principle, is a rule of thumb devised by English meteorologist William Henry Dines which states that winds converging on a given column of air at one altitude tends to be balanced by winds diverging at another altitude, and vice versa. As an example, the air under a thunderstorm rushes in at ground level, rises up through the cumulonimbus cloud, and then disperses at the top of the cloud so there is a balancing of converging and diverging air flows and no net increase in air molecules above a given location.