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<br />. <br /> <br />. <br /> <br />transport would have been then. This additional information may improve <br /> <br /> <br />procedures of the operational project. <br /> <br /> <br />Current and impending weather, upon which an experiment decision is <br /> <br />based, will be derived from the usual forecast products, from GOES <br /> <br /> <br />satellite imagery, from Adamsville rawinsonde data, from local meteoro- <br /> <br /> <br />logical observations, and from wind data from the C-band Doppler radar. <br /> <br />This radar can make Velocity-Azimuth-Display (V AD) scans, and from these <br /> <br /> <br />it is simple to estimate the wind speed and direction in the clouds <br /> <br /> <br />overhead. This information is more frequent than that from the rawin- <br /> <br /> <br />sonde. Some C-band Doppler radar operations will therefore be conducted <br /> <br /> <br />before and during the delivery experiments. Chaff tracking experiments <br /> <br /> <br />using the Ka-band dual-polarization radar may be conducted alongside <br /> <br /> <br />some of the delivery experiments to g,ather supplemental, supporting <br /> <br /> <br />information. Once a decision has been made to conduct the delivery <br /> <br /> <br />experiments they will be carried out in the following manner. <br /> <br /> <br />a. SF,. tracer experiments. Because SF6 is an inert gas occurring <br /> <br /> <br />in very small concentrations naturally its presence downwind of a <br /> <br /> <br />release site can be attributed to transport and delivery of the released <br /> <br /> <br />material through the atmosphere to that site. SF6 is thus often used to <br /> <br /> <br />trace the movement of air pollutants. Its use in the present weather <br /> <br />modification research program will be somewhat of a feasibility study. <br /> <br /> <br />This is partly because the SF6 does not physically interact with the <br /> <br /> <br />cloud in the same way as silver iodide ice nucleating material. Thus <br /> <br /> <br />SF6 measurements may not entirely reflect the transport of silver iodide <br /> <br />which would have .occurred had there be~m seeding. <br /> <br /> <br />Relatively standard equipment will be used for releasing and <br /> <br /> <br />sampling the SF6. Release will be from bottles containing 99.5 percent <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />-27- <br />