196 
Frank Carney 
An area of high pressure means that there the barometer 
registers more than normal. It signifies heavier atmosphere; 
that heavy atmosphere will move outward, displacing lighter 
atmosphere. If Columbus is the center of such a high pressure 
area, over the neighboring land surface the atmosphere is moving 
outward. A low pressure area signifies atmosphere which is 
lighter than normal. At some distance from such a center, the 
atmosphere is always heavier and consequently is moving towards 
the center upward from which the lighter air is rising. 
Weather conditions about cyclonic and anti-cyclonic centers. 
These storm centers, anti-cyclonic (high pressure) and cyclonic 
(low pressure) areas, sometimes are very large, not infrequently 
having a diameter several times that of our state. In that case, 
the movement of the atmosphere on the surface involves several 
degrees of latitude, and a corresponding change in temperature 
so far as it is influenced by latitude. A current of air moving 
southward from the anti-cyclonic center, warms as it goes; grow- 
ing warmer, it can hold more and more moisture; consequently, 
the sky will be clear in the path of the atmosphere which moves 
southward. According to the same principle, a current of air 
moving northward from the storm center grows cooler, its mois- 
ture commences to show in the sky as clouds, and with further 
cooling precipitation falls. 
With a low pressure area central at Columbus, the atmosphere 
from all directions moves towards that city. Atmosphere com- 
ing from the Kentucky side moves into higher latitude and accord- 
ingly is cooled, with clouds and precipitation in that part of the 
storm area. But atmosphere moving from the northern part of 
the state to lower latitudes, warms as it goes, and is able not only 
to hold its own moisture, but to acquire more; on that side of the 
cyclonic area there will be clear sky. 
Over the center of the high pressure area the atmosphere is 
settling or descending; this increasing pressure keeps the tem- 
perature warm or at least constant, hence the sky is clear ; whereas 
at a cyclonic center the air is rising and expanding; thus it cools 
and precipitation falls. 
On account of the earth’s rotation the surface air currents 
about these ^^high” and ^Tow” centers do not move in a straight 
line, but are diverted constantly to the right, as they move, in 
this hemisphere, and to the left, south of the equator. When we 
