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<br />. <br /> <br />. <br /> <br />. <br /> <br />Friday, July 12 <br /> <br />3:15 p.m.-4:45 p.m. <br /> <br />regions. Tropical storms which move over the Atlantic coastline produce large precipitation <br />events over the coastal region as a result of their tropical storm dynamics and on-shore <br />convergence.. Large precipitation amounts over the mountains benefit from enhanced dynamics <br />caused by the orographic lifting as the moist air mover over the central portions of the Carolinas <br />do not have enhanced dynamics associated with the coastal or mountain rainfall centers and <br />therefore produce smaller rainfall totals. Hydrometeorological Report #51 (HMR 51) provides <br />genera1ized guidance for PMP values and tend to smooth the higher PMP values between the <br />western and eastern portions of the states. The site-specific study conducted provides improved <br />detail and structure such that the lower rainfall over the central portions of the Carolinas is <br />identified and quantified. <br /> <br />Updated maximum dew point climatologies have been constructed and the significant storms <br />have been analyzed to incorporated the new dew point climatology into the maximization <br />procedure. A family of curves have been developed to provide quantification of the rainfall <br />decreases as a function of distance from the cost. <br /> <br />Results of the PMP study will be presented. The study results are currently being reviewed by <br />FERC for approval for the use in PMP computations. <br /> <br />Climatology of Extreme Rain Events in United States <br />from Hourly Precipitation Observations <br /> <br />Harold E. Brooks and David J. Stensrud <br />NOAA/ERL National Severe Storms Laboratory <br />and <br />Daniel V. Mitchell <br />NSSL and Cooperative Institute for Mesoscale Meteorological Studies <br /> <br />Flash flooding occurs from the concentration of a meteorological event (heavy precipitation) and <br />a hydrological event. The Hourly Precipitation Dataset (HPD) provides 44 years of precipitation <br />observations from more than a thousand sites in the United States. As Such, it represents one <br />of the best sources of information on the distribution of heavy precipitation available to <br />researchers. We have used the HPD to develop a climatology of short-term (1- and 3-hour) <br />extreme precipitation amounts. <br /> <br />26 <br />