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<br />DATA BASE <br /> <br />The data base for this summary of weather lnodification activities is com- <br />posed of the Initial, Interim, and Final Reports submitted to NOAA. On <br />receipt of an Initial Report, NOAA assigns a file number for the activity; <br />appendix D is a list of the 64 activities analyzed herein for 1979. The <br />records and other information obta.ined under the reporting procedures are <br />available for inspection at NOAA on written Tequest. <br /> <br />All reports are reviewed, and rE~quests are sent or telephoned to the <br />operators when the data are incomplete; replies to these infrequent re- <br />quests for additional information are usual~~ prompt. Experience with the <br />reporting program shows that the information most often requiring a follow- <br />up request concerns sponsor and operator identification, target area maps, <br />aircraft and equipment used, dispersal rates of modification agents, date <br />on which final weather modification activity occurred, and signature. <br /> <br />NOAA maintains surveillance of activities through news-clipping services, <br />National Weather Services Offices, and technical publications, scientific <br />conferences, and personal contacts with the 'weather modification community <br />to ensure that weather modification activities are properly reported. This <br />monitoring procedure disclosed four fog dispersal activities that had not <br />been reported because of misunderstandings between the operator and sponsor <br />regarding responsibility for reporting. After notification of the require- <br />ment to report, the operators subnlitted the proper information. There is no <br />evidence that any other attempts 1:0 modify weather by scientifically accept- <br />ed techniques were not reported during 1979. <br /> <br />S unn:nary of Data <br /> <br />The reported information for calendar year 1979 has been arranged in <br />several categories for conveniencE~ in analyzing the data. These categories <br />are discussed in the following seetions. <br /> <br />Number of Activities <br /> <br />" <br /> <br />Inspection of the 64 reports of weather modification activity listed in <br />appendix D shows that the following pairs of projects were carried out at <br />the same locations in 1979: <br /> <br />3 <br />