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Last modified
7/28/2009 2:28:51 PM
Creation date
10/1/2006 2:17:07 PM
Metadata
Fields
Template:
Weather Modification
Applicant
Western Weather Consultants
Project Name
Central Mountain Area/Cloud Seeding
Date
11/15/1980
Weather Modification - Doc Type
License & Permits
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<br />i: :-C " : <br />f! .' . <br />~ ' <br /> <br />At tac hm"n t il <br /> <br />" <br /> <br />~: <br />, <br />; <br /> <br />S);CUING CIUTf:IUA <br /> <br />'I'll" s"lecti"n o( suitable cioud systems (or seeding operations will be based <br />on an evaluation of multiple meteorological and cloud physics p.\rameters. <br />It is the understandinj; that the following criteria \,ill be adhered to: <br /> <br />a. Cloud base water - Natural Precipitation. Cloud systems with a <br /> a cloud base water content of 1. 5 gms/kgm (Nor th Sector) to <br /> 1. 8 gms/kgm (South Sector) or greater will be considered as <br /> potentially seedable. In this consideration a weather system <br /> will be evaluated for seeding potential if it is determined <br /> that at least natural precipitation is likely to occur. <br /> <br />b. Effective temperature Pre-trough or Pre-frontal. Cloud <br />"ystellls with a 500 Mil temperature of _270 C or warmer \-(ill <br />be considered as potentially seedable. <br /> <br />c. Effective temperature Post-trough or Post-frontal. _Cloud <br />systems with cloud' top temperatures of _1.7" C (North Sectorr <br />to _300 C (South Sector) wiIl be considered as.potentially <br />seedable. <br /> <br />d. \larrier level \,inds. Hind speeds [rom favorable directions al:. <br />heij;hts approximately 2,000 feet above the seeded harrier of <br />30 knots or less for pre-trough cloud types and up La ~ro knots <br />or' Ie,ss fur p,'st-trough clouds wUI be considered ,~s potentinlly. <br />favorable for seeding treatment. Some adjustments are made to <br />the ucccptablc \.ind velociLy ran!;es depending on the wideh of <br />the barrier to be seeded. <br /> <br />..- <br /> <br />t'. Cloud base height. Cloud systems ,,,ith bnses less thnn 2,000 <br />f.,et abovu the mean I>nrr1cr height I'J.ll be considet'cd ns . <br />potentially seedable. <br /> <br />f. <br /> <br />Additional weather system considerations. AddiCional adjustments <br />will be made on the seeding rate or the seeding potential of a <br />cloud system bnsed upon the depth of the cloud sysJ.em to. be. <br />seeded, whether the cloud system is indicating ref~evelopment or. . <br />is near its decaying stage and I'hether the cloud/system has a <br />potential source of abundant natural nuclei from higher cloud. <br />systems. <br /> <br />-' <br /> <br />Once. a weather system is considered seedable by evaluating the <br />:IIHlV., cloud '\lid l\luteol"olugical parameters. an -appropriate seed _ . " <br />r:lte is cnlculated for the initial portion of the "eather system. <br />As the forecast and observetl parameters.of the weather system ." <br />change seeding rates are re-evaluated and changed as is necessary <br />for the new or expected cloud conditions. <br />
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