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<br />. <br /> <br />in the future, and on the basis of these forecasts Alerts at Levels 3, <br /> <br />. <br /> <br />4, 5 and 6 will be declared. For shortelr time periods existing weather, <br /> <br />and that physically approaching the study area, will assume greater <br /> <br />importance. Impending "significant cloud cover" would lead to an Alert <br /> <br />It <br /> <br />of Level 2. <br /> <br />This wil I be upgraded to Level 1 if there is - existing <br /> <br />significant cloud cover or when noticl:! is given that data collection <br /> <br />operations are to commence. <br /> <br />. <br /> <br />Several different cloud physics and kinematics experiments will be <br /> <br />conducted. They are described below. Although the experiments differ <br /> <br />in their objectives data for each experiment can be collected with one <br /> <br />. <br /> <br />or more of a relatively small number of different radar scans. Given <br /> <br />this overlap of experiments so far as raldar data collection is concerned <br /> <br />a primary sequence of several different radar scans has been devised <br /> <br />. <br /> <br />which should efficiently yield the data needed for all the experim~nts. <br /> <br />This primary sequence of scans also reduces the likelihood that data <br /> <br />unsuitable for any experiment will be collected for any length of time. <br /> <br />. <br /> <br />The primary sequence of scans obeys the following strategy. A <br /> <br />basic time period is defined within which the two radars and the <br /> <br />radiometer complete the sequence. Fo,o ease of coordination this time <br /> <br />. <br /> <br />period is chosen to be divisible into sixty minutes an integral number <br /> <br />of times. An advantage of this is that the operators of the instruments <br /> <br />then know what the other instruments are doing without extensive radio <br /> <br />. <br /> <br />communication. <br /> <br />The radio channels are then available more for <br /> <br />discussion of observations than details of scan procedures. <br /> <br />- <br />I n determining the primary sequen(:e of scans the scan rate of the <br /> <br />. <br /> <br />radiometer was key. The radiometer CClnnot complete a full 360 degree <br /> <br />azimuth scan in much less than fifteen minutes. An elevation scan with <br /> <br />. <br /> <br />-35- <br />