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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 />produced ridging over the research area latc In the day on the 19 Fchruary, resulting in a pronounced <br />backing of the ,..rinds to more south\\'cstcrly directions, but only slight warming since the pool of cold <br />air with the main trough rcmainl.-d in place over most uflhe western U.S. The 0500 700 mb pattern <br />and the cloud field arc ShO\\l1 in Fig. 22. <br />The research area \\'as in a region of broken 10 scattered clouds which passed over RRS <br />during the day. The 19 February RRS data in Fig. 23 show the carly morning short wave passage at <br />about 0530. This ,",,'as followed by variabk SLW depths indIcative of\','cak convection. One seeding <br />experiment was conducted with silver iodide released from only the MSU gcm:rator at liAS. ^ <br />research flight took place from 0800 through 1130. A GOES image recorded near the end of the <br />experiment 3t 1100 is shown in Fig. 24. RelatIvely \\-'ann-topped clouds remained over the centml <br />mountains of Utah with a fairly cloud-free region to the south through west over Arizona and <br />southern California. <br /> <br />- <br />~. <br /> <br />I>-- <br /> <br /> <br /> ..... <br /> 2860 <br /> 2880 <br /> ~ <br /> - 2900 <br />\ l...., <br />j,RRS <br /> 292 <br /> OJ" <br /> ....------ I <br />/ <br /> ~ 2960~ i <br /> / <br />-- - <br /> <br /> <br />2880 <br /> <br />29 0 L..- <br /> <br /> <br />29 0 <br /> <br />2~~0 <br /> <br /> <br />PI?,,,re 22. Same a.\. Fig. ~. except/or /200 GAiT (0500 A/Sf) on /9 February /99~. <br /> <br />32 <br />