Release Notice for Oklahoma Mesonet Data
September 20, 1996, rev. November 16, 1999, rev. February 2, 2000

Raw Data Files: sgp05okmX1.00 (ends 10/11/99)
		sgp15okmX1.00 (ends 10/11/99)
		sgpokmX1.00 (begins 12/01/99 source of .a1 data streams)
		sgpokmX1.01 (begins 1/1/99 source of .b1 data streams)
	
Data Streams: sgp05okmX1.a1 (05 minute averages)
	      sgp15okmX1.a1 (15 minute averages)
	      Beginning January 1, 1999:
	      sgp05okmX1.b1 (05 minute averages with quality assurance flags)
	      sgp15okmX1.b1 (15 minute averages with quality assurance flags)
	   
Introduction: 

The Oklahoma Mesonet (sponsored by University of Oklahoma and Oklahoma State)
provide 05 and 15 minute averaged surface data daily in near real-time and
quality assured data files with about a monthly delay.  
 
Stations:

Automated observing stations located throughout the state.  Their 
names, latitudes and longitudes can be found at the following URL address
under "Site Description":

http://okmesonet.ocs.ou.edu/siteinfo/  

Instruments:

See 
http://okmesonet.ocs.ou.edu/overview/instruments.html
for sensor specifications.

05 Minute Measurements:

Parameters are sampled every 3 seconds except barametric pressure, which is
sampled every 12 seconds.  The averaging interval is 5 minutes.
The parameter value for the average represents the time at the end of the
averaging interval.  The parameters measured are:

	relative humidity (percent)
	air temperature at 1.5 meters (C)
	average wind speed at 10 meters (m/s)
	vector average wind magnitude (m/s)
	vector average wind direction at 10 meters (degrees)
	standard deviation of wind direction (degrees)
	standard deviation of wind speed (degrees)
	maximum wind speed (m/s)
	accumulated rainfall (mm)
	pressure (hPa)
	solar radiation (watts/m^2)
	air temperature at 9 meters (C)
	average wind speed at 2 meters (m/s)
	

15 Minute Measurements:

Parameters are sampled every 30 seconds.  The averaging interval is 15 minutes.
The value for the average represents the time at the end of the averaging 
interval.  The parameters measured are:

	soil temperature at 10cm beneath natural sod cover (C)
	soil temperature at 10cm beneath bare soil (C)
	soil temperature at 5 cm beneath natural sod cover (C)
	soil temperature at 5 cm beneath bare soil (C)
	soil temperature at 30 cm beneath natural sod cover (C)
	leaf wetness index (percent) **
	site battery voltage (volts)
	
** the leaf wetness index appears in the .a1 files until 10/10/99 but
the Oklahoma Mesonet scientists report that the sensor never worked
properly and that the data should not be used. This measurement is
not included in the .b1 level data.	

Quality control flags (values from 0-9) are available for each
measurement in the 5 and 15 minute averaged data in the .b1
data streams. The flag values and their meaning are as follows:

1  Suspect (there is concern about accuracy of datum) 
2  Warning (datum is very questionable but information can be extracted) 
3  Failure (datum is unusable) 
4  Not Installed Yet (station awaiting installtation of sensor) 
5  - (internal use only) 
6  - (internal use only) 
7  parameter not checked 
8  Never Installed (station is not intended to measure this parameter 
9  Not Applied / Missing Datum (datum is missing for this station and 
	parameter or QA not applied) 

Missing Data Values:

-99999 denotes invalid or missing value
 
More information about the automated quality assurance procedure
can be made available.

Questions regarding the content of the data stream should be directed to:

	Laurie Gregory
	gregory@bnl.gov
	631-344-2266