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<br /> <br />ATLANTIC <br /> <br />a Water <br />. Flight Areas <br />00 Rain Gages <br /> <br />Figure 2. - Facility locations, target areas and rain gage network. <br /> <br />During the active portion of the day, significant radar <br />echoes were mapped from the scope at intervals of 15 <br />to 20 minutes, providing a record of echo and movement <br />growth for later analysis. Figures 4 (a)-(d) are a sample <br />sequence of these maps, showing how the development <br />and movement of shower groups could be followed and <br />the aircraft directed accordingly. These maps, together <br />with the observations made by the Commission's <br />network of rain gages and printouts from the onboard <br />instrumentation systems on the airplanes, comprised <br /> <br />6 <br /> <br />.J <br /> <br />\ <br /> <br />'I <br /> <br />100 om (DME) <br /> <br />.~ <br /> <br />~ <br /> <br />50 om (DME) <br /> <br /> <br />/ ~ACIFIC <br /> <br />the data base for assessment of program results. <br /> <br />Operational missions tended to follow natural ups and <br />downs of the local weather, which divided the period <br />into rainy episodes separated by relatively dry condi- <br />tions. These episodes, lasting from 4 to 8 days, <br />corresponded to the passage of disturbed portions of <br />the intertropical convergence belt. Fourteen episodes <br />were recognizable during the course of the operational <br />period. <br />