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Special Announcement

The Office of Hydrologic Development maintains historical hydrologic data up to September 30, 2005.

NEXRAD Stage I File Description


These data products are encoded in binary format.  The individual hourly products have a naming convention of the following format:

"nnnHDPxxx.mmdd.hhmmss"

For the period of record prior to January 2002:
Each day these encoded products are compressed and tarred into a daily file named "SimmddyyRFCIDraw.tar". At the end of month, these daily files are tarred into a monthly file and posted on the web in the form of "SimmyyRFCIDraw.tar".

For the period of record beginning January 2002:
Each day these encoded products are compressed and tarred into a daily file named "stage1raw_mmddyyyy_RFCIDraw.tar". At the end of month, these daily files are tarred into a monthly file and posted on the web in the form of "stage1raw_mmyyyy_RFCIDraw.tar".

To extract hourly NEXRAD Stage I files, first untar the monthly files to get the daily files, then untar the daily files to get the compressed hourly files, then uncompress the hourly files.

Use the UNIX tar and uncompress utilities or equivalent.

The following notation applies.

	nnn	three character NWS office identifier
	xxx	three character radar identifier
	mm	two-digit month number (01-12)
	dd	two-digit day of the month (01-31)
	yy	two-digit year (00-99)
        yyyy    four-digit year (beginning 2002)
	hh	two-digit hour in UTC (00-23)
	mm	two-digit minute in UTC (00-59)
	ss	two-digit second in UTC (00-59)
	RFCID	two character River Forecast Center identifier


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Page last modified: April 19, 2010

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