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<br />~ <br /> <br />M <br /> <br />m. <br />on <br />,fts <br /> <br />be <br /> <br />ng <br />,er- <br />-to <br />:ek <br /> <br />eo- <br />:ra- <br />red <br /> <br />VI. PHASE II OPERATIONAL PLAN <br /> <br />conditions, calibrate generator output, if this proves <br />practical, and maintain radio contact with the <br />Steamboat Springs headquarters for operating in- <br />structions. The output from anyone generator will <br />be about 1013 nuclei/second as measured at -200 c; <br />this output will produce about 104 nuclei/ms over <br />the target area. Four percent AgI-acetone solution <br />will be used in the generators. Although two gen- <br />erators should be adequate under the prescribed- <br />operating conditions, the others will be available for <br />reliability assurance. <br /> <br /> <br />Particle Detection <br /> <br />During November, December and January, about <br />five ZnS diffusion runs-using the Emerald Moun- <br />tain and auxiliary dispensing sites, one aircraft and <br />one truck detecting station-will be made to <br />confirm Phase I diffusion data under early winter <br />conditions. The operating procedures will be ex- <br />actly the same as those used in Phase I. <br />Snowmelt samples from the diffusion tests and <br />from artificial nucleation operations will be an- <br />alyzed for ZnS content with the detector developed <br />during Phase I. Our experience indicates that it is <br />important to have uncontaminated snow samples <br />and that the test tubes used for the analysis be <br />clinically clean and sealed before use. Since the <br />analysis procedure is simple, samples can be ex- <br />_ amined immediately after a storm and no backlog <br />in this work need develop. The same snowmelt <br />samples, and replicas taken during each storm, will <br />be analyzed for Ag-by the neutron activation an- <br />alysis technique-and for supercooled water drops <br />-optically. <br />Natural nuclei count, using the expansion cham- <br />ber technique, will be continued at the Valley View <br />Lodge laboratory. <br /> <br />Measurement Network Operation <br />and Servicing <br /> <br />The measurement network will consist of the <br />stations shown in figure 73. All needed equipment <br />has been installed during Phase I, except stream <br />gages. Table 13 shows the measurement to be taken, <br />and how often. <br />The precipitation network servicing cycle will be <br />on a flexible schedule during Phase II. We have <br />proved in Phase I that sensor operation can be <br />extended to 10 days without battery replacement, <br />and data reduction at reduced paper speed pre- <br /> <br />Ii <br />I' <br />'i <br /> <br />69 <br /> <br />Operation <br /> <br />Table 13.-Network Measurement Characteristics-Phase n. <br /> <br />When conducted <br /> <br />Snow-rate measuremenL____....... <br />Surface temperature <br />measurement. <br />Surface wind measuremenL_____ <br />Surface pressure measurement. <br />Surface humidity <br />measurement. <br /> <br />Continuous. <br /> <br />Continuous. <br /> <br />Continuous. <br /> <br />Continuous. <br /> <br />Continuous. <br /> <br />Radar observations-_____________ PPI-one/30 min. <br />A Scope-one/30 <br />min. over all <br /> <br />Rawinsonde observation____......_ <br /> <br />Rawin observation__......__...__...__ <br /> <br />Artificial nucleation________________ <br /> <br />Tracer dispersion______...________...____ <br /> <br />Snowflake replicas } <br />Nuclei count <br /> <br />Snowmelt sampling___..._______________ <br /> <br />Storm total precipitation <br /> <br />measurement. <br /> <br />Stream gage measuremenL_____,_ <br /> <br />during <br />storm <br />periods <br /> <br />stations, one <br />minute <br />exposure. <br />One each storm period or <br />each 6 hours for protracted <br />storms. <br />One each hour during storm <br />periods. <br />I. Precipitation at Steamboat <br />Springs. <br />2. Emerald Mountain at or <br />a bove freezing level. <br />3. 11,000 foot ASL wind <br />3000-1800 true. <br />One hour during each nu- <br />cleated storm period. <br />One hour during, to 3 hours <br />after, nuclei dispersion; at <br />least once in each storm; 12 <br />hours all times. <br />Within I day after nuclei dis- <br />persion or after each storm, <br />3 ft. deep core x 6 in. diam. <br />eter. <br />Within I day after each storm <br />period. <br />Continuous. <br /> <br />sents no difficulties. However, in the interest of <br />better timing and precipitation-total measurements, <br />we will service all stations as soon as possible after a <br />storm, and all instruments at anyone station will be <br />serviced at the same time. During Phase I, we <br />never aborted a servicing cycle because of weather, <br />but the IO-day sensor capability does give us in- <br />creased flexibility in case a protracted bad-weather <br />situation develops. <br />The Soil Conservation Service will make snow- <br />course measurements at all 21 existing network <br />snowcourses and at the Valley View Lodge labora- <br /> <br />