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<br />:1 <br />'I <br />'I <br /> <br />-21- <br /> <br />'" <br /> <br />4) DDC area tornado watches - Same as 3), but only for the <br />Dodge City area. <br />5) Perfect tornado forecast - Operations are suspended on <br />those days with a tornado reported within the DDC area. <br />The last three crite~ria consider the tornado threat as <br />the only reason for suspending cloud seeding activitie!s. In <br />fact, this is not true. Some suspension criteria should be <br />defined for damaging hail, damaging winds and flooding rains. <br />The derivation of these criteria is beyond the scope of this <br />study. <br />Severe weather watches are more likely to be issued on <br />days with widespread moderate to heavy rainfall according to <br />Table 3 which shows the relationship between watches and <br />rainfall in amount categories. About 72% of the very light <br />(0.3-3.0 rom) rainfalls as compared to anywhere from 81-100% <br />of the rainfalls greater than 3.0 rom would have been eliminated <br />if the operations were subject to the most conservative suspen- <br />sion criterion. These percentages decrease as the restrictions <br />are relaxed. The tornado watches (DDC area) criterion would <br />suspend operations on only 31% of the potential seeding oppor- <br />tunity days. By contrast, only 8% of the seeding opportunity <br />days would also be tornado days. <br /> <br />. <br /> <br />TABU'; 3, PerCenla!;C of June seeding opportunity days (rain days) <br />for whieh opcrations would havc to bc ~uspend,"od, <br />- <br /> I'creen t by suspension <br />Rain amount criteria Total number of rain <br />(mm) :! 3 4 S days, June 1965-71 <br />0.3-3.0 72 43 26 16 0 61 <br />3-6 100 84 58 S3 21 19 <br />6-12 8\ 63 44 38 13 16 <br />12-25 86 64 64 57 2\ 14 <br />>25 \00 50 25 25 0 4 <br />Total 81 55 39 31 8 114 <br />