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I I I I I I I I I I I I shaded in variou$ colors for permanent reference purposes and for post operation analyses. Storm activity and aircraft positions were also documented by an 8 roro tlmelapse camera system mounted atop a second PP I display nearby. . Drawn onto the radar PPI 1s the outline of the target area boundaries, target area counties, neighboring counties, state lines and positions of many regional towns. Also, lines are drawn at each ten degrees af compass using the Garden City VOR as the primary aircraft navigational aid. Range marks have been put on those VOR radial lines so ~hat a close approximation of distance and direction from the VOR 1s instantly available. to the meteorologist during operations. D. AIRCRAFT SEEDING OPERATIONS Three cloud base seeding aircraft and one Cloud-top aircraft were used in the 1990 operational period. The cloud base planes were: (1) 3 single engine Piper Aircraft Comanches, PA24-250 (2) 1 twin engine Piper Navajo, PA31-325 All three cloud base aircraft were equipped with Carley-type liquid fuel generators for cloud seeding, one mounted to each wing tip. Each generator holds approximately 6 gallons of a liquid seeding agent solution and burns silver iodide at the rate of two grams per minute of operationj approximately two gallons an hour. Each plane carries approximately 720 grams of silver iodide and is capable of a minimum continuous seeding time aloft of about 3 hours <using both generators. simUltaneously), The planes were flown on an as-needed basis during the season. These aircraft worked at cloud base in the preferred updraft areas of ~be clouds. The cloud base planes were stationed at Lakin, Johnson and Scott City. The cloud top aircraft, based in Dodge City, was equipped with a specially built dry ice dispenser capable of carrying 200 pounds and releasing 5 pounds of dry ice per minute. About 200 additional pounds of dry ice could be carried aboard the plane a5 well. The aircraft normally attempted seeding at the 20.000 foot level, but final altitude assignment depended upon air traffic controllers. The plane made penetrations near cloud top releasing the dry ice into the newly growing clouds around parent storms or into incipient storm development along longer lines. The WKWM concept under which seeding operations were conducted were similar to many other programs of this kind: The meteorologist makes the operational decisions both to launch and to position the seeding aircraft as well as to send instructions pertaining to seeding operations and flight termination. Seeding 1s performed 16