Updating U.S. Precipitation Frequency Estimates for the Midwestern Region

The purpose of this study is to determine annual exceedance probabilities (AEP) and average recurrence intervals (ARI) for durations ranging from 5 minutes to 60 days and for ARIs from 1 to 1,000 years. The point estimates will be spatially interpolated to a spatial resolution of approximately 4km x 4 km. The study results will be published as volumes of National Oceanic and Atmospheric Administration (NOAA) Atlas 14, a wholly web based publication available at www.nws.noaa.gov/ohd/hdsc. The publication will include the artifacts provided in Volumes 1 and 2 including access through the Precipitation Frequency Data Server, base grids in standard formats, electronic copies of maps, results of trend analyses, charts of seasonal distributions and probabilistic temporal distributions, and detailed documentation. Updated areal reduction factors are being developed as a separate appendix to NOAA Atlas 14 for the entire U.S. including Alaska. The project will review and process all reasonably available rainfall data. It is recognized that the rainfall data archived by NOAA's National Climatic Data Center (NCDC) may not be sufficient to accomplish the objectives of this project. Therefore, other data available from sources such as State Climatologists and other Federal, State and local agencies will be examined and included if appropriate. The state of the art techniques and processes developed and applied for NOAA Atlas 14 Volumes 1 and 2 will be applied. They include regional frequency analysis based on L-moments including error estimates, a combination of PRISM based techniques and CRAB for spatial interpolation, techniques for the analysis of climatic trend, temporal distribution and seasonality, internal consistency checks and variety of automated processes designed to enhance productivity. Intermediate results in the form of hourly and daily estimates at several ARIs will be distributed for peer review as will the final documentation.


  • English


  • Status: Completed
  • Funding: $1642013
  • Contract Numbers:


  • Sponsor Organizations:

    Minnesota State Aid


    Oklahoma Department of Transportation

    200 NE 21st Street
    Oklahoma City, OK  United States  73105

    South Dakota Department of Transportation

    700 East Broadway Avenue
    Pierre, SD  United States  57501

    Nebraska Department of Roads

    1500 Highway 2
    Lincoln, NE  United States  68502

    Missouri Department of Transportation

    1617 Missouri Boulevard
    P.O. Box 270
    Jefferson City, MO  United States  65102

    Minnesota Department of Transportation

    395 John Ireland Boulevard
    St Paul, MN  United States  55155

    Kansas Department of Transportation

    Eisenhower State Office Building
    700 SW Harrison Street
    Topeka, KS  United States  66603-3754

    Iowa Department of Transportation

    800 Lincoln Way
    Ames, IA  United States  50010

    Colorado Department of Transportation

    4201 East Arkansas Avenue
    Denver, CO  United States  80222
  • Project Managers:

    Kerenyi, Kornel

  • Start Date: 20090410
  • Expected Completion Date: 0
  • Actual Completion Date: 20140930
  • Source Data: RiP Project 29762

Subject/Index Terms

Filing Info

  • Accession Number: 01563882
  • Record Type: Research project
  • Source Agency: Federal Highway Administration
  • Contract Numbers: TPF-5(187)
  • Files: RIP, STATEDOT
  • Created Date: May 23 2015 1:01AM