JP2.2 NOAA/NWS UPDATED PRECIPITATION FREQUENCIES FOR THE OHIO RIVER BASIN AND SURROUNDING STATES

The rainfall frequency atlases and technical papers published by the National Oceanic and Atmospheric Administration’s (NOAA) National Weather Service (NWS) serve as national standards for rainfall intensity at specified frequencies and durations in the United States. The Hydrometeorological Design Studies Center located in the Hydrology Laboratory of the NWS is updating the standards for the Ohio River basin and surrounding states published in NWS HYDRO-35 "Five- to 60-minute precipitation frequency for the eastern and central United States " (Frederick et al. 1977), Technical Paper No. 49 "Two- to ten-day precipitation for return periods of 2 to 100 years in the contiguous United States " (Miller 1964) and Technical Paper No. 40 "Rainfall frequency atlas of the United States for durations from 30 minutes to 24 hours and return periods from 1 to 100 years " (Hershfield 1961). The study includes estimates for th