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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 />be made to estimate the most seedable periods for the various <br />storm types that affect the region. <br /> <br />Cloud systems that produce precipitation are usually <br />composed of a mixture of ice and water, even though some or <br />all of the cloud is at a temperature colder than the freezing <br />level. Often much or most of the cloud mass is composed of <br />tiny water droplets with only a relatively few ice crystals. <br />These liquid cloud droplets are referred to as supercooled <br />liquid water (SLW) because they remain in a liquid state even <br />though below freezing. In order for cloud seeding to be effective <br />in enhancing precipitation, SLW must be present within the <br />cloud mass, for it is the conversion of some of the SLW to <br />ice crystals by the introduction of seeding material that <br />act as ice crystal nuclei, that augments the natural precipitation <br />process. In developing the storm climatology it is hoped <br />that a better understanding of the composition of the storms <br />that affect the Mogollon Rim will ultimately provide answers <br />to important questions regarding seedability such as: <br /> <br />How often and in what quantity is SLWpresent in winter <br />storm clouds? <br /> <br />Is SLW more frequent with particular storm types (e.g., <br />shallow storms with low cloud tops)? <br /> <br />How often is it cold enough for significant AgI (silver <br />iodide) nucleation when SLW is present? <br /> <br />Is SLW content related to wind speed and direction? <br /> <br />3-2 <br />