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interfacing the radar and computer were produced by Mr. Dennis Tredennick, of SPEC, Inc., Boulder, CO. The software was an outgrowth of a version of an original program developed in South Africa in the early 1970's by Mr. Tredennick for a previous long- term hail suppression project there. The height of the 45 dBZ intensity level within clouds has been used commonly to examine hail potential in storms, analyzing storm intensity (or potential destructiveness) relative to another storm in order to make the best operational decision regarding the placement of aircraft. Output is displayed in color on a computer monitor. Although one person can operate the whole system easily, it works better with an assistant independently operating the computer while the meteorologist mans the radar console. There were 3757 storm measurements (RBIs and PPls) archived in 1993. In the PPI mode the display automatically shows all regional boundaries, counties, neighboring counties, state lines, the VOR navigational aids, positions of county seats and other regional towns. Radar echo intensities are contoured in different colors. On the radar system PPI display radial lines are drawn at each ten degrees of compass using the Garden City VOR as the primary aircraft navigational aid. Range marks have been put on the radials to be able to closely approximate distance and direction from the VOR when needed during operations. The use of the GPS systems in some of our aircraft, referred to earlier, will make using VOR directions nearly obsolete in the future. Also incorporated into the total operational radar system is an aircraft interrogator/transponder flight tracking system. Radar specifications and interrogator/transponder specifications are found in Appendices E and F, respectively. Although we are able to simultaneously track three differen~ transponder codes, only two are used on any given operation. The cloud base aircraft use a single code assigned to us by the Federal Aviation Administration through long-standing agreement with them (Feb. 1984); whereas, cloud top flights are given a different code each flight. D. AIRCRAFT SEEDING OPERATIONS Four cloud base seeding aircraft and one cloud-top aircraft were used in the 1993 operational period: (1) 4 single engine Piper Aircraft Comanches, PA24-250 (2) 1 twin engine Piper Navajo, PA31-325 All four cloud base aircraft are equipped with Carley-type liquid fuel generators for cloud seeding, one mounted to each wing tip. Each generator carries approximately 6 gallons of liquid 17