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<br />Changnon, S. A., 1979: An assessment of the socio-economic and environmental aspects of weather
<br />modification. World Meteorological Organization Report, No. 13, Precipitation Enhancement Project,
<br />Geneva, Switzerland, 122-135.
<br />
<br />No abstract.
<br />
<br />Changnon, S. A., and F. A. Huff, 1979: Review of societal, environmental, and legal aspects of precipitation
<br />modification in lllinois. Report, NOAA Contract 03-78-BOI-89. Illinois State Water Survey,
<br />Champaign, IL, 79 pp.
<br />
<br />No abstract.
<br />
<br />Chou, He-Y., 1991: Doppler radar analysis of the 17 July 1989 squall line in North Dakota. M.S. thesis,
<br />Department of Meteorology, South Dakota School of Mines & Technology, Rapid City, SD, 88 pp.
<br />
<br />No abstract.
<br />
<br />Cleveland, H. (Chainnan, The Weather Modification Advisory Board), 1978: The Management of Weather
<br />Resources. Vol. l. Proposals for a national policy and program. Supt. of Doc: US-GPO,
<br />Washington, DC (003-018-00090-3), 229 pp.
<br />
<br />No abstract.
<br />
<br />Cotton, W. R, E. E. Hindman, G. J. Tripoli, and P. A. Walsh, 1983: Numerical simulation and observational
<br />analysis of the dynamic response of towering cumuli to massive seeding. Final Report, NOAA Grant
<br />NA81RAHooool. Department of Atmospheric Science, Colorado State University, Fort Collins, CO,
<br />365 pp.
<br />
<br />No abstract.
<br />
<br />Czys, R R., and R. W. Scott, 1993: A simple objective method used to forecast convective activity during the
<br />1989 PACE cloud seeding experiment. Journ~l of Applied Meteorology, 32 (accepted).
<br />
<br />A simple objective procedure used exploratively to forecast the occurrence, height, and coalescence
<br />activity of summertime convective clouds in lllinois during the cloud seeding trials of the 1989
<br />Precipitation Augmentation for Crops Experiment is described. The method used the temperature of the
<br />convective condensation level (fcCL) and potential buoyancy (PB) at 500 mb, easily determined from
<br />morning National Weather Service sounding data, to forecast afternoon convection. Maximum echo top
<br />heights were found to group according to TcCL and PB. The physical basis of TCCL and PB to
<br />implicitly represent a period of time for coalescence to produce supercooled drizzle and rain drops is
<br />discussed. The technique performed well at forecasting the occurrence and height of afternoon
<br />convective clouds. Aircraft measurements of supercooled rain drop concentrations showed that a
<br />discriminator function, dependent only on T CCL and PB, gave a good indication of the presence or
<br />absence of supercooled drizzle and rain drops in the updrafts of clouds at the -lOoC seeding level.
<br />Median concentrations of supercooled drizzle and rain drops (ND > 300) in updraft regions at the -lOoC
<br />level were found to be best approximated by a third-order polynomial dependent on TCCL and PB,
<br />presenting a possible physical link between cloud scale environment and in-cloud conditions..
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