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<br />II. BACKGROUND <br /> <br />A. Data__Sources and Px:.~ cct:..~_~cti_~!!. <br /> <br />Of the numerous winter orographic projects which could ha.ve been <br /> <br /> <br />included in an analysis of this type, seven proj ects were finally <br /> <br /> <br />selected. The criteria used to select the projects were that the <br /> <br /> <br />meteorological and topographical extremes be covered, tha.t ran- <br />domization of seeded events was used, and that sufficient quality <br />data be readily available to permit a reasonable likelihood that <br /> <br />statistical signi ficance could be reached through testing. <br /> <br />The quality and quantity of data varied considerably from proj ect <br />to project. While some projects had only interpolated rawinsonde <br />and sparse precipitation gage data, others had physical measure- <br />ments from sources such as aircraft flights, ground microphysics <br />measurements, and radar. There were problems encountered in <br />standardizing data from the projects because of missing data <br />and inconsistencies in data ret:ords. Therefore, rather than <br />narrow the set of cases to include on.ly those few projects or <br />portions of projects with the most complete physical measurements, <br />it was decided to base the statistical analysis on precipi tat.ion <br />gage data and rawinsonde information. This information was avail- <br />able for all the projects and therefore the range of geographic <br /> <br />7 <br />