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I I I I I I I I I I I I I I I I I I I ~".,"_".._""."_T'_.n Project instruments for measuring and recording precipitation, wind, temperature, and microphysical characteristics of storms are installed yearly within, around, and downwind of the project area prior to the beginning of the field operational period on October 15. The instru- mentation network is operated through the following May 15 after which time most of the instruments arl9 removed for the summer months. How- ever, a smaller instrument network consisting of 20 recording precipi- tation gages and 4 hygrotherm09raphs is maintained during the May 16 through October 15 period to obtain data for studies which examine: (1) the accumulation and melt of snowpack and the occurrence of summertime precipitation as they effect the environment and ecology of the San Juan Mountain Range area, and (2) the complete hydrological cycle of the area, including separation of runoff resulting from melting snowpack from that caused by summer precipitation. In addition to the instrument network installed and operated by WSSI personnel, a telemetry meteorological system was installed by WSSI in the pilot project area during the 1969-70 winter season. This telemetry system consists of a base station, five radio repeaters, three remote meteorological stations, and a remote controlled cloud seeding generator. This network was turned over to the seeding contractor for operation following installation and testing. 2.1.6 Field Operations and Safety Procedures - Background measurements of activated ice nucleus concentrations at various temperatures I measure- ments of low level winds using pilot balloons, and time lapse movie pictures of the wolf Creek Pass area are being obtained daily during the October 15 - l\Aay 15 period. Daily measurements of precipitation amounts from nonrecording gages and snowboards, and samples of freshly fallen snow are obtained after each 24-hour period in which precipitati(~m occurs. The recording precipitation gages, hygrothermographs, and mountaintop wind systems are all "serviced on a routine schedule. Travel to remote measurement sites in the project area is by 4-wheel drive vehicle, over-snow vehicles, Cind helicopter. Figure 3 shows two meteo- rological technicians servicing a remote recording precipitation gage which they reached by a WSSI owned over-snow vehicle. Note the spare light duty over-snow vehicle and lugqage carrier which contains emergency medical supplies, food, water, tent, heater, sleeping bag, and dry clothing for use in the event vehicle breakdown occurs while field service personnel are at high elevations far from travelled roads. A schedule is established prior to each day's work by field crews when the work involves travel to remote project areas via over-snow vehicles and rescue operations are initiclted if personnel have not checked in with the field supervisor prior to a prearranged time. It has been necessary to implement th is procedure only once during the 4t seasons of activity -8-