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National Weather Service
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National Weather Service
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As a result of the requirement in METAR for the use of 4-letter site identifiers as opposed to 3-character site identifiers used at many sites in the current SA code, a number of identifier changes will take place. Some will actually occur after METAR has been implemented.
The FAA is the source of change for these identifiers and as they forward changes to the NWS the changes will be posted on this page by their effective date. These listings are not meant to preclude the FAA's normal notification process for identifier changes via the publication of their Location Identifier Handbook 7350.6 . It is merely provided as information to aid in the transition to the METAR code. The responsible FAA organization for making these identifier changes is the National Flight Data Center (ATM-612). A subscription to the FAA's Handbook 7350.6 is available by writing to the following address or by calling 202-512-1800 (voice) or 202-512-2250 (fax):
Superintendent of Documents Government Printing Office Washington, DC 20402
The listings provided on the home page give you the city/state, airport name (if available), old 3-character identifier, new 3-letter identifier, and new 4-letter International Civil Aviation Organization (ICAO) identifier. Please note that for identifier changes in the conterminous 48 states, the ICAO identifier merely prefixes a "K" in front of the new 3-letter site identifier. For Alaska sites, a "PA" is prefixed which means that one of the 3 letters of the site identifier is truncated. Hawaii sites will have a prefix of "PH" added and Guam will have a prefix of "PG" added. Like the Alaska sites, the Hawaii "PH" or Guam "PG" prefixes will mean one of the 3-letters in the identifier may have been truncated.
The official list of ICAO identifiers is published by the ICAO in document 7910. This document is available from the ICAO at the following address or by calling 514-954-8219 (voice) or 514-954-6077(fax):
International Civil Aviation Organization
999 University Street
Montreal, Quebec
Canada H3C 5H7
Email: icaohq@icao.org
Click on the effective date you want in order to view the identifier changes effective for that 56-day cycle.
Search the NWS Meteorological Site ID Database or the FAA Airport and NAVAID Database from AirNav
Page Author: A.W. Jarvi, NWS Office of Systems Operations