United States Weather Agency Identifiers
The National Weather Service uses several schemes for identifying stations. It typically relies on the ICAO and WMO identifiers, although several weather forecast offices (WFOs) and weather radar sites that have moved away from airports have been given their own codes which do not conflict with existing codes. These typically end in X, such as where Birmingham, Alabama (BHM) had its radar site replaced by one south of the city (BMX), or where the Knoxville (TYS) office was moved to nearby Morristown, Tennessee (MRX). Others have changed such that Miami, Florida is now MFL instead of MIA, and Dallas/Fort Worth (formerly DFW) is now FWD. Climatological applications use the WBAN (Weather Bureau Army Navy) system, which is a five-digit numeric code for identifying weather stations under its jurisdiction.
Recently it began using four-letter-plus-one-number identifiers for specialized weather requirements such as hydrometeorological stations. These are used by the USFS RAWS system, and by the stream gauges operated by the USGS, both of which report through GOES weather satellites operated by NOAA. These use three letters which are a mnemonic for the location, followed by the first letter of the U.S. state, followed by a numeral indicating the alphabetical order within that letter (for example, North Carolina stations end with N7). The mnemonic may be the nearest town, or the name of the stream, or a combination of the two; and the same names may be rearranged into different mnemonics for different nearby locations. For example, VING1 is the gauge at Vinings, Georgia, and is differentiated from other stations along the Chattahoochee River (such as CHAG1 in nearby Oakdale) which are also at the Atlanta city limit like Vinings is, and from other streams in Atlanta such as Peachtree Creek (AANG1).
The United States Air Force Weather Agency (AFWA), acting on behalf of all the American military services, assigns special use ICAO identifiers beginning with "KQ", for use by deployed units supporting real-world contingencies; deployed/in-garrison units providing support during exercises; classified operating locations; and units that have requested, but not yet received a permanent location identifier.
One system still used by both the Air Force and National Climatic Data Center is the Master Station Catalog or MASLIB code. This is a 6-digit numeric code that is essentially the same scheme as the WMO station identifier but adds an extra digit, allowing many more stations to be indexed. This extra digit is always "0" when referencing an actual WMO station using the 5-digit identifier, but may be 1..9 to reference other stations that exist in the vicinity. The MASLIB identifiers are not generally recognized outside the United States.
Read more about this topic: Location Identifier
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