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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />predominately convective systems from the stratiform storm <br />systems is that it may be quite likely they would be treated <br />with different seeding strategies were they ultimately to <br />be seeded. <br /> <br />Thus, from the above, the following four categories were <br />defined: <br /> <br />ss- Those episodes forced by synoptic-scale features <br />such as lows, troughs and fronts and composed of essentially <br />stratiform cloudiness. <br /> <br />SC- Episodes forced by synoptic features such as lows, <br />troughs, and fronts but having significant embedded convective <br />cloud elements. To be classified "SC", it was necessary <br />that convective clouds be present at least half of the <br />episode and be of appreciable vertical extent. For example, <br />stratocumulus cloud decks were considered stratiform <br />while cumulus congestug was classified as convective. <br /> <br />MS- Those episodes not linked with any discernible synoptic- <br />scale features and with predominately stratiform clouds. <br />For example, a cap-cloud over an isolated mountain peak <br />or small ridge. <br /> <br />MC- Episodes not linked with synoptic-scale features <br />and composed of predominately convective clouds. An <br />example of this type would be the daytime periods during <br />which diurnal heating generated cumulus congestus or <br />cumulonimbus over the Rim while adjacent skies remained <br />essentially cloud-free. <br /> <br />3-8 <br />