June 29, 2004
Final Updated Ohio River Basin and Surrounding States Precipitation Frequency Estimates published!
The Hydrometeorological Design Studies Center (HDSC) of NOAA's National Weather Service has published updated precipitation frequency estimates for the Ohio River Basin and Surrounding States (Delaware, District of Columbia, Illinois, Indiana, Kentucky, Maryland, New Jersey, North Carolina, Ohio, Pennsylvania, South Carolina, Tennesse, Virginia and West Virginia). The new estimates (known as NOAA Atlas 14 Volume 2) cover the full range for durations from 5 minutes to 60 days and for average recurrence intervals from 2 to 1000 years. For the first time, confidence limits are included.
The new estimates replace those contained in 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), NWS HYDRO-35 "Five- to 60-minute precipitation frequency for the eastern and central United States" (Frederick et al., 1977) and Technical Paper No. 49 "Two- to ten-day precipitation for return periods of 2 to 100 years in the contiguous United States" (Miller et al., 1964).
The final estimates are available through the new Precipitation Frequency Data Server (PFDS) as a link ("PF Data Server" on the left sidebar) on the HDSC's home page at http://www.nws.noaa.gov/ohd/hdsc/. Documentation of the estimates will be added in the near future.
For states not included in the Semiarid or Ohio River Basin updates, links are provided to current precipitation frequency (PF) documents on-line.
Fur further information please contact HDSC at HDSC.Questions@noaa.gov
NOTE: Recent visitors to the PFDS may have to force PFDS web pages to reload to see the newest material, otherwise an old cached page may load. To do this, hold down the Ctrl key while reloading the page.
For further information regarding Ohio precipitation data please contact: