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NOAA Atlas 14 Precipitation Frequency Estimates
in GIS Compatible Formats
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This web page provides access to NOAA Atlas 14 precipitation frequency estimates (mean values and upper and lower bounds of the 90% confidence interval) that were calculated based on the analysis of partial duration series in GIS compatible formats.
- ASCII grids - These files contain the final, spatially interpolated, high-resolution (~800 m) NOAA Atlas 14 precipitation frequency estimates and are the basis for the PFDS interface results. Please review the grid metadata (below) for projection, units, and other details.
Grid metadata:
- Shapefiles - These vector files were created by contouring the gridded precipitation frequency estimates and they were used to create the cartographic maps. Please review the metadata contained in the downloaded *.tar file for projection, units, and other details. The vectors represent a simplification of the underlying gridded precipitation estimates and are not recommended for extraction of point precipitation frequency estimates.
The GIS formats are provided as a convenience to users and do not imply endorsement by or represent opinions of the U.S. Government.
DOWNLOAD GIS DATA:
The files can either be downloaded 1) via pull-down menu, 2) by anonymous ftp or 3) via web browser. Since the size of compressed ASCII grid files and shapefiles is between 2 and 4 MB, ftp is recommended for multiple-file downloads. To obtain precipitation frequency estimates without downloading files, please visit the PFDS interface.
1) Via pull-down menu:
2) By anonymous ftp:
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Action
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Type
this
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Open
ftp to the server:
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ftp hdsc.nws.noaa.gov
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Login
as anonymous user:
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anonymous
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Give
the password (your email id):
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myemail@company.com
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Switch
to binary mode:
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binary
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Change
directory:
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cd pub/hdsc/data/xx/ (replace "xx" with "sa" for Semiarid, "orb" for Ohio River Basin and Surrounding States, "pr" for Puerto Rico or "hi" for Hawaii)
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Get
one file:
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Example: mget sa100yr24ha.ver4.gz (this will download the 100-year 24-hour ArcInfo ASCII grid for the Semiarid Southwest)
Example: mget sa100yr24hav4_shp.tar.gz (this will download the 100-year 24-hour ESRI Shapefile and associated metadata file for the Semiarid Southwest)
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Get several files
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Example: mget sa*yr24ha.ver4.gz (The wildcard '*' in this case will get all frequencies for the 24-hour duration)
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Quit
ftp:
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quit
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3) Via web browser:
alternatively you can peruse the ftp directory via a browser.
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www.nws.noaa.gov
