. Elementary physical geography . orting out those movementswhich they need, and not being retarded by those which areopposed to their motion. It has been suggested by ProfessorLangley that it is not impossible that these air movementsmay be employed in aerial navigation by man himself. REFERENCE BOOKS. Ferrel. —A Popular Treatise on the Winds. Wiley & Sons, New edition, 1890. 8vo. $ (In part a republication of KecentAdvances in Meteorology, Report of U. S. Signal Service for 1885, PartII., Washington.) Buchan.— Report on Atmospheric Circulation, Challenger Reports,Physics and
. Elementary physical geography . orting out those movementswhich they need, and not being retarded by those which areopposed to their motion. It has been suggested by ProfessorLangley that it is not impossible that these air movementsmay be employed in aerial navigation by man himself. REFERENCE BOOKS. Ferrel. —A Popular Treatise on the Winds. Wiley & Sons, New edition, 1890. 8vo. $ (In part a republication of KecentAdvances in Meteorology, Report of U. S. Signal Service for 1885, PartII., Washington.) Buchan.— Report on Atmospheric Circulation, Challenger Reports,Physics and Chemistry, Volume II. Eyre & Spottiswoode, London,England, 1889. 4to. 52s. 6d. (Contains a remarkable series of chartsrelating to temperature, pressure, and atmospheric circulation.) See also the general books by Davis, Waldo, Greely, and others, referred toat the end of the other chapters. CHAPTER V. STORMS. Cyclonic Storms.— As used here, a storm is any con-dition of cloudiness accompanied by rain. On coasts that. Fig. 41. Ideal diagram of a storm. Large arrow shows path of storm; small arrows,inhlowing winds; circles, lines of barometric pressure; and shaded areas, dis-tribution and intensity of rain. rise in the paths of moist winds, clouds and rain are oftencaused by the condensation of water vapor, which results 85 86 PHYSICAL GEOGRAPHY. from the rising of the air, and the consequent cooling untilthe dew-point is reached. In the same way, air that rises asa result of convection may reach the dew-point, thus form-ing clouds and rain. These kinds of rainstorms are not ofparticular importance in northern United States, and there-fore need not be considered in detail. These causes aid in the formation of the very importantgroup of storms which bring the greater part of the rainthat falls in the northern half of this country. To these thename cyclonic storms may be given ; and these are not of BAROMETER ITHACA — ^— S~ \^- \^ 1 ^ 24 25 28 291893 Fig. 42. 31 Se
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