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  • Heavy Rainfall Frequencies for the U.S.

    NCDC is the world's largest active archive of weather data. NCDC produces numerous climate publications and responds to data requests from all over the world. NCDC operates the World Data Center for Meteorology which is co-located at NCDC in Asheville, North Carolina, and the World Data Center for Paleoclimatology which is located in Boulder, Colorado.

    NCDC supports a three tier national climate services support program - the partners include: NCDC, Regional Climate Centers, and State Climatologists.

    top of page Rainfall Frequencies by State

    These data are useful in, and often required for, the engineering design of any structure subject to the affects of heavy rainfall-such as drainage culverts, pipes, roof tops, etc. The new publications, which are linked here, provide users with rainfall frequency distributions which are more detailed than (and often differ from) the previous publications. The NWS Hydrometeorological Design Studies Center has issued a web page ("Current Precipitation Frequency Information and Publications") which lists which publications should be used for each state, and the time periods for which each should be used (5 min-60 min, 1 hr-24 hr, and 2-day-10-day periods).

    Go to top of page NOAA Atlas 14

    • Semiarid Southwest
      NOAA - Atlas 2 is no longer valid for the "Semiarid Southwest." This includes the following states: Arizona, Nevada, New Mexico, Utah, and Southeast California. For these states, NOAA - Atlas 2 (Volumes 4, 6, 7, 8 and part of 11) has been replaced by NOAA Atlas 14, Volume 1. This publication is available ONLY as an online version and can also be found at:

    • Ohio River Valley
      Hydro-35 and Tech Paper No. 40 are no longer valid for most states in the Ohio River Valley and surrounding states. This includes the following states: Delaware, Illinois, Indiana, Kentucky, Maryland, New Jersey, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Virginia, West Virginia, and Washington, DC. For these states, Hydro-35 and Tech Paper -40 have been replaced by NOAA Atlas 14, Volume 2. This publication is available ONLY as an online version and can be found at:
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    Last Updated Friday, 23-Jan-2009 08:15:32 EST by
    Please see the NCDC Contact Page if you have questions or comments.