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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />f <br />j, <br />I <br />I <br />I <br /> <br />"back" side. The "front" side is downwind, ahead of the line. <br />Although some updrafts are found on the front part of these storms, <br />it is not considered of primary importance in the formation of <br />precipitation. Normally, the important updrafts are found below <br />cloud base at some distance behind the precipitation area, along <br />its trailing edge. Storm movements often become variable depending <br />upon several factors, among them terrain effects, dynamic factors <br />within the storm, cloud height and variability of wind speed and <br />direction with height. <br /> <br />Seeding a Typical Air Mass Storm Complex <br /> <br /> <br />30,000 FT. <br /> <br />20,000 FT. <br /> <br />~~-'i; <br /> <br />CLOUD TOP SEEDING <br /> <br />15,000 FT, <br />MSL <br /> <br />8.,000 FT. <br />MSL <br />CLOUD BASE <br />SEEDING <br /> <br />3.000 FT, <br />MSL <br /> <br />_ ~r <br />I""" <br />~~ <br /> <br />16'20,000 Fr. <br /> <br />UPDRAFT AREA <br /> <br />" <br /> <br />FIG. 4 <br /> <br />10 <br />