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WMO Publication No. 9 - Weather Reporting
Volume C1 - Catalogue of Meteorological Bulletins

FILE NAMING

Semi annual updates:	File Naming	Record Format	File Transfer
Advanced Notifications:	File Naming	Record Format	File Transfer

Advanced Notifications		Semi Annual Files		Description
ED02229O.txt ED02229P.txt (CCnnmddF.txt)		EDZW2229O.txt EDZW2229P.txt (CCCCmddF.txt)		Description
ED	CC	EDZW	CCCC	CC/CCCC = The international four-letter location indicator (in upper-case) of the responsible RTH (eg EDZW, RJTD, EGRR etc..Full details as regards abbreviated headings are contained in WMO Publication No. 386 - Manual on the GTS - Vol I - Part II.
02	nn	n/a	n/a	nn = Sequence number of the advanced notification file. There are two different series of the sequence number (01 to 99) one for "observational data" and one for "products" (i.e. “F”= O and “F”= P) which are initialized at the beginning of each year.
2	m	2	m	m = The month of updating the file: 1=January 6=June A=October 2=February 7=July B=November 3=March 8=August C=December 4=April 9=September 5=May
29	dd	29	dd	dd= The day of updating the file: 01= 1st of the month, 02= 2nd of the month etc... Sequence number of the advanced notification file. There are two different series for the sequence numbers (01-99) one for "observational data" and one for "products" (i.e. “F”= O and “F”= P). These are initialized at the beginning of the year.
O/P	F	O/P	F	F = File identification: to distinguish the type of the contents: O = observational data file / P = product file Observational data file =O for Observations: where T1= any other letter than those used for Products Product file =P for Products: where T1=D, G, H, J, P, Q, X, Y
.txt	.txt	.txt	.txt	.txt = Is a constant character-set (small letters) which indicates a file in ASCII format. In case of a server which has no distinction between capital and small letters in file system, either of them is used for the file name.