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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I. <br />I <br />I' <br />I <br /> <br />The University of Delaware group also obtainE~d <br />16-mm time-lapse photos of the Patuxent River S-band weather <br />radar. These photos were also determined to be of little USE! in <br />the analysis. <br /> <br />Occasional 35-mm slide and color Polaroid pictures <br />were taken of clouds during the airborne missions. Those photos <br />were helpful in the Case study analyses. <br /> <br />4. 7 Example of Operational Period Data <br />Our analysis indicates that there were numerous <br />occasions when AgI seeding led to a sequence of radar events that <br />would follow the overall physical concept set forth for enhancing <br />convective rainfall (i. e. clouds of greater vertical extent, increased <br />echo duration and horizontal extent, see Section 5 for further expla- <br />nation. <br /> <br />Here we will present only one example of the <br />Operational Period data, as the main thrust of the analysis is con- <br />cerned with the data collected during the Experimental Period <br />covered in Section 5. The case of 2 August is used to demonstrate <br />the type of operations conducted on the sixteen operational flights. <br />On this date seeding occurred between 0822 and <br />1136 hours. Seeding began at the southwestern corner of the target <br />area and continued as the cloud complex moved northeastward <br />across the target. <br />Figure 13 gives the time history of the radar echoes <br />and a narrative of the seeding procedures (note that non-seed echoes <br />outside the target cloud complex have been omitted from the drawings <br />for clarity). The radar echo response to the cloud seeding is en- <br />couraging in that it is in agreement with the physical hyPothesi.s set <br />forth. <br /> <br />40 <br />