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NOAA Atlas 14 Precipitation Frequency Estimates
in GIS Compatible Format

This web page provides access to NOAA Atlas 14 precipitation frequency estimates (with upper and lower bounds of the 90% confidence interval) in GIS compatible format. For Volumes 2 and 3, only partial duration series (PDS)-based grids are available for download; annual maximum series (AMS)-based grids can be calculated by applying ratios from Table 4.6.2 from corresponding NOAA Atlas 14 documents. For NOAA Atlas 14 Volume 1, and Volume 4 and above, both, AMS- and PDS-based grids are available for download. Please note that the precipitation frequency estimates for each volume of NOAA Atlas 14 were computed independently using all available data at the time. Some discrepancies between volumes at project boundaries are inevitable and they will generally be more pronounced for rarer frequencies.


To display and interpret the data, two separate files are needed:
  1. Zipped ASCII grids - These files contain the final, spatially interpolated, high-resolution NOAA Atlas 14 precipitation frequency estimates with confidence limits, and are the basis for the PFDS interface results.

  2. Grid metadata file - These files contain information on projection, grid resolution, precipitation units, and other details relevant to data shown in ASCII grid files. Grid metadata files are in the XML format and are automatically downloaded with zipped ASCII grids. The grid metadata files can be also viewed and downloaded separately below.

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Page Author: HDSC webmaster
Page last modified: October 6, 2014
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