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<br />Weather Modification Permit (WM2) <br />Applicant: David Petrocco Farms, Inc. <br />Date: March 4, 1998 <br /> <br />OPERATIONAL PLAN <br /> <br />I. <br /> <br />Description of the obiectives of the proposed proiect. <br /> <br />Commercial operation of a hail suppression device using sequenced sound waves to produce <br />a cavitation effect in ice forming within cumulus cloud formations in order to inhibit the <br />. ~o~~~i~~ ?~ice partic1~s ~~using.t~e moisture. t.ofa!l a.srainrathe..r tj1~n_h~lwithiD the target _ <br />area. <br /> <br />2, <br /> <br />Description of the target area and the area reasonably expected to be effected by the proiect. <br /> <br />The target area includes the parcels listed on Attachment A located in the south central part <br />of Weld County, Colorado and north central part of Adams County, Colorado. Please see <br />attached map(s) of target area(s), <br /> <br />3. Description of how the proiect will be carried out (including location of office and weather <br />data used). <br /> <br />The project will be carried out by the instal1ation and operation of a hail cannon located within <br />the above-described target area(s). The target area will cover a circle (with the hail cannon <br />at the center) with a radius of 500 meters, Due to distortions resulting from prevailing winds, <br />the target area may becoine enlarged to the extent that the areas reasonably expected to be <br />affected by the project are those areas within a 1,000 meter (3,280 feet) radius of the hail <br />cannon. [The distortions will be dependent upon the velocity of the prevailing winds. <br />Generally, prevailing wind currents crossing the continental divide will be from the west or <br />the northwest and would present a target area elongated to the downwind side south <br />(south/east) and shortened on the upwind side of the 500 meter target radius]. <br /> <br />The hail cannon is designed to direct sound waves upward to penetrate the ice particle- <br />producing area of the clouds in order to inhibit the formation of hail stones. The hail cannon <br />is a cylinder-shaped upright chamber, in which acetylene is ignited, discharging energy (in the <br />form of sound waves) upward/perpendicular to the ground, Discharges from the hail cannon <br />are controlled by a computer which sequences the time interval between sound discharges. <br />The decision to commence operation of the hail cannon will be determined by visual <br />observation ofthe operator/applicant. Under ideal conditions, the operation of the hail cannon <br />will commence ten (10) minutes before the expected arrival of the hail-producing cloud over <br />the target area and will continue operation until the hail-producing cloud(s) has fully passed <br />over the target area. The decision to commence operation of the hail cannon will be made by <br />