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<br />2.3 No-cost Evaluation by Seeding Contractor
<br />
<br />The Denver Water Department program's seeding contractor, Larry Hjermstad, proposes
<br />the testing ofa currently utilized Seeding Response Model developed by Western
<br />Weather Consultants (WWC) to evaluate operational seeding programs. Since this model
<br />was based upon similar results found from evaluating both the Colorado River Basin
<br />Pilot Project (a randomized research seeding program) and the Vail Seeding Program (a
<br />long-term operational program), this evaluation tool is worthy of testing. We would be
<br />looking for both a comparative (CSU RAMS and WWC Model) amount or percentage
<br />change of the natural forecast precipitation and evaluate how this amount or percentage
<br />changes with respect to average directional storm movement through the region or cloud
<br />types being seeded. WWC will provide the meteorological data for the test as part of the
<br />operational data. The purpose of this analysis is to compare with what the model
<br />estimates at the same observation sites.
<br />
<br />References
<br />
<br />Cooper, W.A. (1980) A method of detecting contact ice nuclei using filter samples.
<br />Preprints, 8th International Conf on Cloud Physics, Clermont-Ferrand, France:
<br />665-668.
<br />
<br />Cotton, W.R., G. Thompson, P.W. Mielke, Jr (1994) Real-time mesoscale prediction on
<br />workstations. Bull Amer Met Sac 75: 349-362.
<br />
<br />Cotton, W.R., R.A. Pielke, Sr., R.L. Walko, G.E. Liston, c.J. Tremback, H. Jiang, R.L.
<br />McAnelly, J.Y. Harrington, M.E. Nicholls, G.G. Carrio, J.P. McFadden (2003)
<br />RAMS 2001: Current status and future directions. Metear. Atmas Physics, 82, 5-
<br />29.
<br />
<br />Curry, J.A., P.V. Hobbs, M.D. King, D.A. Randall, P. Minnis, G.A. Isaac, J.O. Pinto, T.
<br />Uttal, A. Bucholtz, D.G. Cripe, H. Gerber, C.W. Fairall, T.J. Garrett, J. Hudson,
<br />J.M. Intrieri, C. Jakob, T. Jensen, P. Lawson, D. Marcotte, L. Nguyen, P.
<br />Pilewskie, A. Rangno, D.C. Rogers, K.B. Strawbridge, F.P.J. Valero,
<br />A.G.Williams, D. Wylie (2000) FIRE Arctic clouds experiment.
<br />
<br />DeMott P.J., M.P. Meyers, W.R. Cotton (1994) Parameterization and impact of ice
<br />initiation processes relevant to numerical model simulations of cirrus clouds. J
<br />Atmas Sci 51: 77-90.
<br />
<br />Deshler, T. (1982) Contact ice nucleation by submicron atmospheric aerosols. PhD
<br />dissertation, Dept of Physics and Astronomy, University of Wyoming, Laramie,
<br />WY,107pp.
<br />
<br />Feingold, G, R.L. Walko, B. Stevens, W.R. Cotton (1998) Simulations of marine
<br />stratocumulus using a new microphysical parameterization scheme. Atmas Res
<br />47-48: 505-528.
<br />
<br />II-14
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