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1. INTRODUCTION During the summer of 1996 the Colorado Climate Center (CCC) and Henz Meteorological Services (HMS), in support ofthe CCC Extreme Precipitation Study, entered into discussions concerning historic storms which have produced heavy precipitation particularly over higher elevation locations in the State of Colorado. Six Storm Regions, as defined by the CCC and discussed at an October 1996 Workshop in Denver, are as follow (see Figure 1): I. Great Plains, 2. Front Range and Eastern Foothills, 3. Southwest Mountains, 4. Northern Mountains, 5. Colorado Plateau (southwest Colorado), and 6. Northern Basin (northwest Colorado). At the October Workshop participants agreed on li~;ts of important stonns for consideration for each of these Regions. CCC entered into a Service Agreement with HMS in early September 1996 which requested HMS to review and interpret the clata availability for certain stOlm events which affected Colorado and southern Wyoming: A copy of this Service Agreement is included in an Appendi x attached to this report. These events, a subset of the lists produced at the Workshop, are as follow: . Event 1: Penrose, Colorado; June 2-6,1921, . Event 2: Cimmaron, Colorado; June 3, 1952., . Event 3: Plnm Creek and Kiowa Creek, Colorado; June 16-17, 1965, . Event 4: Big Thompson Canyon, Colorado; July 31,1976, . Event 5: Poudre River and Rist Canyon, Colorado; August 1, 1976, . Event 6: Frijole Creek, Colorado; July.3, 1981, . Event 7: Cheyenne, Wyoming; August ]1, 1985, . Event 8: Opal, Wyoming; August 16,1990, . Event 9: Muddy Creek, Colorado; June 20, 1994, . Event 10: Robideau Creek, Colorado; August 10, 1993, and . Event 11: Pagosa Springs, Colorado; August 22,1'995. In addition to reviewing and interpreting available data, HMS was also asked to identify storms meriting rainfall reconstruction and to consider the: implications ofthe~se eleven events for future site-specific PMP determinations.