Earth's highs and lows, the constant Moon, and taming the fuel of stars

From: The Sunday Telegraph London | Date: June 23, 2002| Author: | Copyright information

In weather forecasts we hear of high and low pressure - but is there a medium pressure in between?

J. R. Johnson, Preston

There is a mathematical dividing line between high and low pressure, set according to a standard "reference model" of the atmosphere arrived at in 1965, according to which the average sea- level pressure is 1,013.25 millibars. In practice, however, meteorologists are more concerned with the behaviour of low- or high- pressure regions, and focus instead on the flow of the air within them. In the northern hemisphere, a low-pressure region is defined as having anti-clockwise ...

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