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<br />I <br />I <br />I <br />I <br />I <br /> <br />Western Kansas may be even a better area for similar clouds developing than in the research area <br />in Texas. In our early years scant attention was paid to those weak-appearing multiple-celled <br />cloud clusters until one had grown fairly large.. If those cloud systems had been treated in their <br />early stages instead of waiting to see whether they would grow to become larger, most likely <br />more frequent success in rain stimulation and/or hail suppression probably would have occurred. <br />Today, however, we anticipate that these smaller cloud clusters can develop into larger cloud <br />systems and can provide targets of opportunity to produce increased rainfall over large areas, or <br />that these could become regions of severe storm development. Spectacular rain enhancement <br />results appear to have occurred on some past occasions when seeding such cloud systems. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I I <br />I <br />I <br />I <br /> <br />Another storm sequence, particularly bothering to cloud base seeders, occurs somewhat <br />often. This particular type of storm is often part of a line of severe storms and it may, or may not, <br />have been seeded. The storm collapses sending out a large gust front, however, there remains <br />strong, new feeder storms attached to the parent storm. While the parent storm had been <br />obtaining most of its moisture from below cloud base, as the storm collapses it appears that it <br />maintains strong feeder growth due to mid-level convergence and sufficient mid-level moisture <br />which is present. Many other factors may help detennine whether the parent storm will collapse or '. <br />whether after a short period of re-organization, it will resume as a new storm. Some of the <br />factors detennining whether the storm will persist or die appears to depend upon the storm's <br />direction of movement, atmospheric instability, the amount of mid-level moisture present and the <br />strength and organization of the winds at mid-levels and at cloud top; there are undoubtedly other <br />factors as well. <br /> <br />What makes this storm difficult to treat is that no steady updrafts can be found and what <br />are found below cloud base are embedded in heavy turbulence along with equally sharp <br />downdrafts. Sustained, steady updrafts are not found; however, above cloud base the feeder cells <br />continue to grow rapidly, eventually producing precipitation cores containing property and crop- <br />damaging hail. This type of storm can only be seeded properly above cloud base. <br /> <br />12 <br />