Laserfiche WebLink
<br />authors provided a climatology of supercooled water measurements similar to that <br />in Figure 23, but for 1 hour averages. The magnitude and general characteris- <br />tics of th'e distribution of supercooled water measurements in both locations <br />, . <br /> <br />were very similar, an in.teresting' result considering that the 'arinua1 precipita- <br />tion at the crest of the Grand Mesa is only two-thirds of that measured in the <br /> <br />Sierra Nevada. <br /> <br />8. IMPLICATIONS FOR CLOUD SEEDING <br /> <br />Lastly, we discuss the implication of our results for cloud seeding opera- <br /> <br />tions in the Sierra Nevada. The success of cloud seeding, when used to augment <br /> <br />precipitation, depends on many factors, one of which is the presence of super- <br /> <br />cooled water. Our results indicate that supercooled water is present in <br /> <br />distinct regions of Sierra Nevada storms. The location of these regions, and <br /> <br />the magnitude and duration of the presence of supercooled water depend strongly <br /> <br />on the synoptic scale structure, intensity, evolution and trajectory of the <br /> <br />storms. <br /> <br />Sinc~ the dGration of ~upercooled water in clouds is typically 2-10 hours, <br />it is important to be able to forecast these events reliably in order to seed <br />effectively. The post-frontal regions of storms with zonal flow characteristics <br />appear to provide the best situation for forecasting supercooled water events <br />since the subsidence region associated with a reduction.in cloud depth is often <br />evident as a distinct high cloud boundary on satellite photographs. Identifying <br />this boundary was one of the primary forecasting techniques used operationally <br />during SCPP. Reyno1d~ and Kuciauskas (1987) have provided detailed analyses of <br />the structure of the atmosphere in the vicinity of this boundary using radar, <br />satellite and other data. These authors showed that radar and satellite may be <br /> <br />32 <br />