WMOD00284

• Applicant: Thompson, J.R., G.W. Wilderson, and D.A. Griffith, North American Weather Consultants
• Sponsor Name: USBR
• Title: Cloud Seeding Data Collection, and Analysis Assoc. with the Colo River Augmentation Demonstration Program
• Prepared For: USBR, Divison of Atmospheric Research
• Prepared By: Thompson, Wilderson, Griffith
• Date: 12/1/1987
• State: AZ
• Weather Modification - Doc Type: Scientific Study

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In March 1985, North American Weather Consultants (NAWC)
was awarded a contract (as part of the CRADP) to provide the
necessary personnel, supplies, materials and equipment, transport
vehicles, permits, licenses, and insurance required to carry
out experimental cloud seeding over the Grand Mesa. NAWC's
additional contractual obligations included meteorological
data collection and analysis.

Subsequent to the contract award, NAWC applied for and
was granted a license to modify weather within the state of
colorado by the Department of Natural Resources. In Colorado,
individuals are granted licenses rather than Corporations.
Therefore, the actual licensee was John Thompson, a NAWC employee.
He was also designated as the Principal Investigator for the
contract with the Bureau. Following this, NAWC/Thompson made
application for a permit to conduct winter cloud seeding research
over the Grand Mesa. A notice of intent to conduct weather
modification research was published in eight newspapers in
the six counties surrounding the research area, and after
a public hearing in September 1985, the applicant was granted
a permit for the period from November 1, 1985 through March
31, 1986. The permit was later amended to extend through
June 30, 1986, for the express purpose of system testing two
prototype cloud seeding generators which were under development
for the Bureau.

Limited experimental cloud seeding was conducted for
the first time as part of the CRADP during the 1985-86 winter
season over the Grand Mesa. Seeding activities, which included
aerial and ground releases of a silver iodide-ammonium iodide-
acetone complex, were associated with three research areas,
e.g., microphysical experiments, transport and dispersion

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