NOAA Atlas 14 Download Page

• Several digital formats of the precipitation frequency estimates are available, including:
  • High-resolution (30-sec) ArcInfo ASCII Grids (regional)
  • Vector (contour) ESRI compatable Shapefiles (regional)
  • Color, Cartographic-quality Maps (state-specific) (.pdf)
  
  FINAL color cartographic maps are now available for the Ohio River Basin and Surrounding States (DC, DE, IL, IN, KY, MD, NC, NJ, OH, PA, SC, TN, VA, and WV) for ALL durations! (September 27, 2004)

  Viewing some documents may require the Adobe Reader. To download the Adobe Acrobat Reader plugin, click here.

  The files can either be retrieved via pull-down menus below or by anonymous FTP. Since the grid files and shapefiles are ~4MB (compressed), ftp is recommended for multiple-file downloads.
  
  The spatial data files are provided in an ArcInfo ASCII grid or shapefile format which can be read by most GIS software.
  NOTE: The links on this page are provided on this web page as a convenience to users and does not imply endorsement by or represent opinions of the U.S. Government.

  Region:	Return period:	Duration:	Format:	Type:
  Semiarid Southwest Ohio River Basin and Surrounding States	2-year 5-year 10-year 25-year 50-year 100-year 200-year 500-year 1000-year	5-minute 10-minute 15-minute 30-minute 60-minute 2-hour 3-hour 6-hour 12-hour 24-hour 2-day 4-day 7-day 10-day 20-day 30-day 45-day 60-day	Shapefile ArcInfo ASCII Grid	Mean Upper Limit Lower Limit

  State*:	Return period:	Duration:	Type:
  Arizona California (southeast) Delaware District of Columbia Illinois Indiana Kentucky Maryland Nevada New Jersey New Mexico North Carolina Ohio Pennsylvania South Carolina Tennessee Utah Virginia West Virginia	2-year 5-year 10-year 25-year 50-year 100-year 200-year 500-year 1000-year	5-minute 10-minute 15-minute 30-minute 60-minute 2-hour 3-hour 6-hour 24-hour 48-hour 4-day 7-day 10-day 20-day 30-day 45-day 60-day	Mean

  * Note: The Ohio River Basin and Surrounding States cartographic maps are divided into 5 zones. Visit the Ohio River Basin and Surrounding states cartographic zone map for details.

• Please review the Semiarid ASCII grid metadata or Ohio River Basin and Surrounding states ASCII grid metadata, disclaimer and README (usage caveat) file before using these datasets. The shapefile metadata is contained in a single, compressed 'tar' file. (For information about metadata in general, click here )

• To obtain the point or areal precipitation frequency estimates without downloading files, please visit the interactive Precipitation Frequency Data Server (PFDS)

• Version numbers are part of each filename. To determine the most recent version number and the associated date, please view the version tables below:

  Version no.	Date	Notes	Station lists
  Semiarid Southwest - NOAA Atlas 14, Volume 1
  Version 1	10/30/2002	Draft data used in peer-review.	n/a
  Version 2	07/14/2003	First final released data.	n/a
  Version 3	01/07/2004	Updated final data. Version 2 vs. version 3 (annual maxima series based) difference maps for: 100-year 60-minute, 100-year 24-hour and 100-year 48-hour.	Hourly station list Daily station list
  Ohio River Basin and Surrounding States - NOAA Atlas 14, Volume 2
  Version 1	08/15/2003	Draft data used in peer-review..	n/a
  Version 2	06/29/2004	First final released data..	Hourly station list Daily station list

• FTP Retrieval Information

  Clicking on files with a .gz suffix or ftp:// prefix will cause your browser to make an "ftp" retrieval. You will want to save this retrieval in a file rather than view it on your screen. See your browser's instructions on how to do this. You may use anonymous ftp to retrieve files that are too large to conveniently retrieve with a broth, or if you wish to retrieve several or all files. Give the login name as anonymous and your email-address as the password. When transferring the .pdf or shapefiles, remember to use the binary transfer method.

  For example, to get sa1000yr24ha.ver3 (The 100-year 24-hour ArcInfo ASCII grid) and save it on your computer, you would need to do the following from a prompt. If using an FTP tool, you will use the same logic.
  
  

  Action	Type this
  Open ftp to the server.	ftp hdsc.nws.noaa.gov
  Login as anonymous user.	anonymous
  Give the password, your email id.	myemail@company.com
  Switch to binary mode	binary
  Change directory.	cd pub/hdsc/data/sa/ (or pub/hdsc/data/orb/)
  Get the file.	mget sa100yr24hr.ver3.gz (or sa100yr24hr.ver3.gz)
  Optionally, get other files;wildcard "*" is often useful	mget ...
  Quit ftp.	quit

• Annual Maximum (AMS) and Partial Duration (PDS) Series datasets are available. The AMS is a listing of the highest observed precipitation depth, per duration, per station, per year. The PDS is a listing of the N greatest observed precipitation depths, regardless of how many occurred in the same year. For more information about AMS and PDS data, please visit the Documentation. These files represent the raw input to the regional L-Moment statistical procedure used to estimate the precipitation frequency depths at various return periods.

  Region:	Series:	Duration:
  Semiarid Southwest Ohio River Basin and Surrounding States	Annual Maximum Series Partial Duration Series	60-minute 2-hour 3-hour 6-hour 12-hour 24-hour 48-hour 4-day 7-day 10-day 20-day 30-day 45-day 60-day