| SL.us008001/ | Data root: for NWS Telecommunication Gateway Server (top directory) | 
		
			| ST.expr/ | Status of data as experimental: NDFD data is being made operational in a transitional manner | 
		
			| ST.opnl/ | Status of data: operational | 
		
			| DF.gr2/ | WMO GRIB files: Edition two, also known as GRIB2 | 
		
			| DC.ndfd/ | Data category: National Digital Forecast Database | 
		
			| AR.aaaaaaaa | Area of Data: aaaaaaaa could be: CONUS, 1 of 16 overlapping NDFD CONUS, the Virgin Islands; Northern Hemisphere; North Pacific Ocean | 
		
			| VP.###-### | Valid Period: ### can be the following: 001-003 covers Days 1-3; 004-007 covers days 4-7; 008-450 covers days 8-450 | 
		
			| ds.sssss | FILE NAME = data subcategory containing abbreviated NDFD element names (sssss). The current file for each element will be kept until overwritten by a new file for the same element |