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<br />Evidenc~ from the 1982-83 field season and other seasons lends strength <br />to the thought that on1 y certain port ions of the general orographic/ <br />area-wide precipitation occurring in Sierra storms may be seedab1e. A <br />concerted effort will be made to identify these storm periods uti1 izing <br />aircraft, radar, rad iometer, and ground-based microplnys i ca1 observa- <br />t ions. Simi 1 arit ies in the synopt ic/mesosca1 e featur1es observed when <br />large amounts of liquid water are present will be established to aid in <br />our forecasting of these events. <br /> <br />e <br /> <br />3 . Can we fin a 1 i z e a S C P P - 2 des i g n for ran d om i zed see din g 0 f <br />orographic/area-wide precipitation? <br /> <br />To the extent we are able to answer question 2 above, WE! will be able to <br />answer thi s quest ion. There are several questions concern ing target <br />area size, targeting abi1 ity and sensitivity of instrumentation to see <br />the seeding effects that are of major concern before final izi ng a <br />design. Observations during 1983-84 are specifically aimed at these <br />problems. <br /> <br />e <br /> <br />4. Can we support and beg in eva1 uating a meaningful ground seeding <br />experiment (SCPP-2A)? <br /> <br />SMUD has been conducting ground-based seeding in the southern ARB for <br />several years. They will continue such operations dur'ing the 1983-84 <br />field season in cooperation with the Bureau seeding operations. Supple- <br />mental radar, rawinsonde, precipitation and some aircriift data will be <br />taken during SMUD seeding events between December and April 1. SMUD <br />will perform a ~andomized experiment using their ground generator <br /> <br />e <br /> <br />1-24 <br />