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<br />The HMS review of historical storms explored three ';)eneral areas of storm <br />information: <br /> <br />1, Identification of key historical storms, <br /> <br />2, Detailed atmospheric data sets derived for key histor'ical storms, and <br /> <br />3, Previous studies of Colorado flood-producing thunderstorms and general <br />storms which affected high elevation portions of the state or nearby states, <br /> <br />Each of these information sources waS investigated for input to the preparation <br />of the site-specific PMP study. The enhanced data sets developed in steps two <br />and three provided information which formed some of the basis for elevation <br />adjustments made to the local and general storm PMP calculation, <br /> <br />2.1 Identification of key historical stclrms <br /> <br />HMS relied on the following primary SOUrCI:lS of extreme precipitation eVEmts to <br />assist in the identification of key historical storms to be used for transposition and <br />maximization over the basin: <br /> <br />1. List of major storms contained in Tablle :2.1 {pages 12-15} ~Ind T~lble 2.2 <br />(pages 18-19) found in HMR 55A, <br /> <br />2. List of extreme precipitation reports compiled by the Colorado <br />Climatological Center as part of the Colorado Extreme PrecipitalticlrI <br />Study and, <br /> <br />3. List of regional extreme precipitation events recommended by the <br />Extreme Precipitation Task Force to the Colorado State Engineer's <br />Office for consideration in local site-specific PMP studies. <br /> <br />Summary information on extreme precipitation events of importanee to high <br />elevation sites in Colorado is provided in Appendix A of the present report It <br />represents the "list of storms" which HMS investigated for transposition into the <br />Mason Reservoir basin. HMS has a long history of meteorological consulting in <br />Colorado which dates back to 1972. f~MS was a funded participant in the <br />Colorado Extreme Precipitation Study, This study was supported by the <br />Colorado Water Conservation Board and the Colorado State Engineer's Office <br />and charged with a historical review of heavy precipitation events in the state, <br />The final report of this Study will identify those events considered mandatory in <br />any future site-specific PMP studies. The candidate storms for such <br />consideration were identified at an October 24, 1996 meeting of the Extreme <br />Precipitation Task Force, Proceedings of this Workshop are summarized in <br />Appendix A. Many storms used in this Study were identified from HMS storm <br />logs and records. <br /> <br />4 <br />