. The climate and weather of Baltimore . In describing the distribution of pressure, winds, temperature, andclouds in typical cyclones and anti-cyclones in the preceding paragraphsno reference was made to their movement as a whole. The systems arenot stationary for any length of time. In addition to the internalcirculation of the winds described, the entire systems are carried east-ward by the general drift of the upper atmosphere in the middle lati-tudes, retaining at the same time their chief characteristics as cyclones MARYLAND WEATHER SERVICE 325 and anti-cyclones for many hundreds, and so
. The climate and weather of Baltimore . In describing the distribution of pressure, winds, temperature, andclouds in typical cyclones and anti-cyclones in the preceding paragraphsno reference was made to their movement as a whole. The systems arenot stationary for any length of time. In addition to the internalcirculation of the winds described, the entire systems are carried east-ward by the general drift of the upper atmosphere in the middle lati-tudes, retaining at the same time their chief characteristics as cyclones MARYLAND WEATHER SERVICE 325 and anti-cyclones for many hundreds, and sometimes thousands of small whirls formed in a rapidly flowing river and carried downstream with the general current, while at the same time maintaining theirown gyratory motion, are often cited as illustrations of the drift ofcyclones and anti-cyclones in the general eastward flow of the atmos-phere between the parallels of 30° and 70° north and south highs and lows do not extend to a great altitude, but are. Fig. 89.—Typical Cyclone and Anti-cyclone of March 3, 1904. formed apparently only in the lower portions of the atmosphere, thegreat majority of them being confined to the atmospheric strata belowthe highest mountain ranges. They are carried in an easterly directionin the middle latitudes with a varying velocity but averaging about 600miles per day, while moving across the United States. There is a con-stant and rapid succession of these atmospheric whirls, or waves of highand low pressure, in the winter and spring season. In summer andearly fall they are less frequent and not so well developed. There is 326 THE CLIMATE OF BALTIMORE an excellent example of a well developed low or cyclone, followed bya high or anti-cyclone in the chart for March 3, 1904. (Fig. 89.) The shifts in the direction of the wind experienced during the passageof these lows and highs may be illustrated upon this chart bynoting the directions of the wind at points along a
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