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" ~ '... '1j ~ r.Il 1 l "':1 ;~ \- Kern COWlty, and a small segment of northwestern Ventura County. Included in this area are the San Rafael Mountains which drain into both the Santa Ynez and Sisquoc rivers, the Sierra Nadre Nountains which drain into both the Sisquoc and Cuyama Rivers, and the Caliente Range which also con- tributes runoff to the Cuyama River and ultimately Twitchell Reservoir. 2.1 Aerial Seeding Plan In the aerial seeding mode the NAWC meteorologist would be located at the Vandenberg radar site during stoms. He would be supported by addi- tional NAh'C persOJUlel located in the NAWC forecast laboratory where com- plete monitoring of storms is done through analysis of weather data received via teletype and facsimile and telemetered raingage data from several raingages located within Santa Barbara and San Luis Obispo COWlties. The seeding potential of individual stonns varies greatly. Large increases can be obtained from some stoms, while seeding other stoms will have little effect or even produce decreases. The atmospheric con- ditions which produce these changes in seeding potential are well known and predictable as a result of NAWC's past research. It is therefore possible to seed only those bands which will produce increases and leave the bands not suitable for treatment unseeded. From the Vandenberg radar site the NAWC meteorologist is able to observe the approach of the stonn on radar, select those portions of the stoms which are most amenable to seeding and utilize the radar and aircraft guidance facilities of Vanden- berg to position the seeding aircraft correctly. This is the operating procedure that was stlccessful1y utilized during the second phase of the Santa Barbara Research Program. A nvin Commanche aircraft, suitably equipped to dispense silver iodide from two seeding tanks was acquired and. became available on Jamlary 6, 1978. At this time, however, aerial operations were not approved since final authority to operate under the guidance of the Air Force surveil- lance radar at Vandenberg had not been granted. Therefore it was 2-5