We can summarize low pressure storms generally in the following manner:
They have a wind circulation inward and upward and are elliptical in
form. Their velocity varies from six hundred to nine hundred miles per
day, moving in the same general direction. They are characterized in
their eastern quadrants by cloudy weather, southerly and easterly winds,
precipitation, temperature oppressive in summer and abnormally high in
winter, falling barometer, increasing humidity and followed by clear
weather, rising barometer, decreasing humidity and falling temperature
in the western quadrants.
Buys Ballot’s law of winds is, that in the Northern Hemisphere if one
stands with his back to the wind, the low barometric pressure will be
invariably to the left hand; in the Southern Hemisphere the lowest
pressure is always to the right. This law explains one of the
characteristics of low pressure storms.