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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 /> <br />are likely to be composed of either stable orographic clouds <br />(generally the best candidates for seeding provided the air <br />mass temperature is not too cold) or at other times may contain <br />embedded wet convective clouds. <br /> <br />3.1.2 <br /> <br />Episode Definition <br /> <br />with this background, the weather patterns which affected <br />the Arizona Mogollon Rim region during the mid-January to <br />mid-March 1987 field season were examined to allow a comparison <br />with the earlier climatological analysis. One of the goals <br />was to attempt to determine whether there were significant <br />differences in the production of supercooled liquid water <br />(SLW) from one weather type to another. If there was, this <br />might be quite useful in making decisions about the seedability <br />of a given storm. Also, it was hoped that the analysis might <br />provide additional insight into whether certain phases of <br />the weather type were more seedable than others, e.g., a period <br />(or periods) when more SLW was being produced. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />storm episodes were defined as generally continuous periods <br />of SLW and/or precipitation, and having no interval longer <br />than 2 hours during which neither some precipitation or SLW <br />was recorded. Integrated SLW measurements (in mm per hour) <br />were made by the Bureau's dual-channel microwave radiometer <br />near the Happy Jack Ranger Station. This instrument was operated <br />in a vertically pointing mode with.readings of liquid water <br />and water vapor made at two minute intervals. These readings <br />were then averaged for each hour for each of the episodes. <br />Average hourly values less than .01 mm were considered to <br />be in the noise range of the instrument and were not used <br />in determining the episode SLW average. However, since they <br /> <br />3-6 <br />