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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 />soutlnvcstcrly \\1nO incrca.<;cd in spl.oed as the trough approached. The regional cloud pallcm and 700 <br />mb fields at 0500 arc shO\'IT1 in Fig. J 1 Here it is evidcnt that the SLW ma:'(imum noted at RRS <br />between 0300 and 0500 \vas 81thc leading edge of the advancing cloud hand, in the area of the <br />warrnt.:r-toppt:d clouds. The arrival of the coldcr.toppt:d cloud hand, to the west ofRRS in Fig. 31, <br />coincided with the decrease in SLW at RRS shortly after 0500. <br /> <br /> <br /> <br />'" <br />2980 29 <br />"\ <br /> <br />--- <br /> <br />(, <br /> <br />'" <br /> <br />Ul...... <br />, <br /> <br />y <br /> <br />-- <br /> <br />I <br />O€O~, <br />! ~~~ <br />'{ <br />\,\ <br />-t <br /> <br />.-RRS <br /> <br />\ <br /> <br />~ <br /> <br />I <br /> <br />2%0 <br /> <br />2980 <br />\ <br /> <br /> <br />I... <br /> <br />""- <br />"-- <br /> <br />L",," <br />I <br />I;igure 3/. Same 11.\ Fig. 4, except filY 1200 (;Arr (0500 M.\7J on 22 '''ehruary /99-1. <br /> <br />'. <br /> <br />\ <br /> <br /> <br />~ <br /> <br />'" <br /> <br />I <br />I <br /> <br />The cloud st..-ooing experiment on 22 February made use oflhc three spt.'Cial valley generators. <br />Seeding commenced at 2200 on 21 February and ended at about 1030 on 22 February. An SF6 <br />release occurred from one of the sites hetween 0715 and 1023. The research aircraft flew from 0728 <br /> <br />until ahoutlll5. As evidenced in Fig. 30, the aerosol plumes were detected at RRS until ahout 30 <br />min after seeding ended. <br />The wind shift at about 1400 (Fig. 30) apparently marked the trough passage~ Although SLW <br /> <br />41 <br />