National Weather Service United States Department of Commerce

NOAA Atlas 2 Precipitation Frequency Estimates
in GIS Compatible Formats

Notes:
Effective August 6, 2003, NOAA Atlas 2 has been superseded by NOAA Atlas 14 Volume 1 for Arizona, Nevada, New Mexico, and Utah.
Effective April 8, 2011, NOAA Atlas 2 has been superseded by NOAA Atlas 14 Volume 6 for California.
Effective April 19, 2013, NOAA Atlas 2 has been superseded by NOAA Atlas 14 Volume 8 for Colorado.
Visit the Precipitation Frequency Data Server for more information.

This web page provides access to high-resolution (15-sec) NOAA Atlas 2 precipitation frequency grids for 2-year and 100-year average recurrence intervals and for 6-hour and 24-hour durations for 5 states in the western U.S. (Idaho, Montana, Oregon, Washington, Wyoming).

To view a scanned version of current NOAA Atlas 2 document for a specific state, please visit our PF Documents page.

To view a complete set of scanned maps from NOAA Atlas 2, visit the Western Regional Climate Center page.


  • PRECIPITATION FREQUENCY ESTIMATES AT A POINT
    To obtain the precipitation frequency estimates at a given point, enter the latitude and longitude (as a negative number) in decimal degrees:
     
                   Latitude: Longitude:
  • PRECIPITATION FREQUENCY GRIDS
    These spatial data sets are provided in an ArcInfo ASCII grid format. Please read the metadata before making any use of the datasets.
     
    The files can either be downloaded via pull-down menu or anonymous ftp:

    1) Via pull-down menu:
     
     
    2) By anonymous ftp:
     
    Action Type
    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 bin
    Change directory cd pub/hdsc/data/idaho/
    Get the file Example: get na2_id_100yr24hr.zip (this will download the 100-year 24-hour ArcInfo ASCII grid for Idaho)
    Optionally, get other files Example: get na2_id_100yr*.zip (the wildcard '*' in this case will get all durations for 100 year in Idaho)
    Quit ftp quit

    The GIS formats are provided as a convenience to users and do not imply endorsement by or represent opinions of the U.S. Government.

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