IDENTIFICATION: CDS header
	Length:0

USAF: Identification FIXED-WEATHER-STATION USAF MASTER STATION CATALOG identifier

	The identifier that represents a FIXED-WEATHER-STATION. 
	Length:6

NCDC: Identification FIXED-WEATHER-STATION NCDC WBAN identifier

	The identifier that represents a FIXED-WEATHER-STATION. 
	Length:5

DATE: Identification GEOPHYSICAL-POINT-OBSERVATION date

	The date of a GEOPHYSICAL-POINT-OBSERVATION. 
	Length:8

HRMN: Identification GEOPHYSICAL-POINT-OBSERVATION time

	The time of a GEOPHYSICAL-POINT-OBSERVATION based on Coordinated Universal 
	Time Code (UTC). 
	Length:4

I: Identification GEOPHYSICAL-POINT-OBSERVATION data source flag

	The flag of a GEOPHYSICAL-POINT-OBSERVATION showing the source or combination 
	of sources used in creating the observation. 
	Length:1
	Default Value:9
	Table of Values:

	1: DATSAV3 observation, candidate for merge with DSI-3280 (not yet merged, failed element cross-checks)
	2: DSI-3280 observation, candidate for merge with DATSAV3 (not yet merged, failed element cross-checks)
	3: DATSAV3/DSI-3280 merged observation
	4: DATSAV3 observation
	5: DSI-3280 observation
	6: ASOS/AWOS observation from NCDC
	7: ASOS/AWOS observation merged with DATSAV3 observation
	8: MAPSO observation (NCDC)
	A: DATSAV3/DSI-3240 merged observation, candidate for merge with DSI-3280 (not yet merged, failed element cross-checks)
	B: DSI-3280/DSI-3240 merged observation, candidate for merge with DATSAV3 (not yet merged, failed element cross-checks)
	C: DATSAV3/DSI-3280/DSI-3240 merged observation
	D: DATSAV3/DSI-3240 merged observation
	E: DSI-3280/DSI-3240 merged observation
	F: Form OMR/1001 - Weather Bureau city office (keyed data)
	G: SAO surface airways observation, pre-1949 (keyed data)
	H: SAO surface airways observation, 1965-1981 format/period (keyed data)
	I: Climate Reference Network observation
	J: Cooperative Network observation
	K: Radiation Network observation
	L: Data from Climate Data Modernization Program (CDMP) data source
	N: NCAR / NCDC cooperative effort (various national datasets)
	

TYPE: Identification GEOPHYSICAL-REPORT-TYPE code

	The code that denotes the type of geophysical surface observation. 
	Length:5
	Default Value:99999
	Table of Values:

	AERO: Aerological report
	AUST: Dataset from Australia
	AUTO: Report from an automatic station
	BOGUS: Bogus report
	BRAZ: Dataset from Brazil
	COOPD: US Cooperative Network summary of day report
	COOPS: US Cooperative Network soil temperature report
	CRB: Climate Reference Book data from CDMP
	CRN05: Climate Reference Network report, with 5-minute reporting interval
	CRN15: Climate Reference Network report, with 15-minute reporting interval
	FM-12: SYNOP Report of surface observation form a fixed land station
	FM-13: SHIP Report of surface observation from a sea station
	FM-14: SYNOP MOBIL Report of surface observation from a mobile land station
	FM-15: METAR Aviation routine weather report
	FM-16: SPECI Aviation selected special weather report
	FM-18: BUOY Report of a buoy observation
	GREEN: Dataset from Greenland
	MEXIC: Dataset from Mexico
	PCP15: US 15-minute precipitation network report
	PCP60: US 60-minute precipitation network report
	S-S-A: Synoptic, airways, and auto merged report
	SA-AU: Airways and auto merged report
	SAO: Airways report (includes record specials)
	SAOSP: Airways special report (excluding record specials)
	SMARS: Supplementary airways station report
	SOD: Summary of day report from U.S. ASOS or AWOS station
	SOM: Summary of month report from U.S. ASOS or AWOS station
	SURF: Surface Radiation Network report
	SY-AE: Synoptic and aero merged report
	SY-AU: Synoptic and auto merged report
	SY-MT: Synoptic and METAR merged report
	SY-SA: Synoptic and airways merged report
	WBO: Weather Bureau Office
	WNO: Washington Naval Observatory
	

WIND: WIND-OBSERVATION header
	Length:0

DIR: WIND-OBSERVATION direction angle

	The angle, measured in a clockwise direction, between true north and the 
	direction from which the wind is blowing. 
	Length:3
	Scale:1
	Unit:Angular Degrees
	Default Value:999
	Table of Values:

	999: Missing.  If type code (below) = V, then 999 indicates variable wind direction.
	

Q: WIND-OBSERVATION direction quality code

	The code that denotes a quality status of a reported WIND-OBSERVATION direction 
	angle. 
	Length:1
	Default Value:9
	Table of Values:

	0: Passed gross limits check
	1: Passed all quality control checks
	2: Suspect
	3: Erroneous
	4: Passed gross limits check , data originate from an NCDC data source
	5: Passed all quality control checks, data originate from an NCDC data source
	6: Suspect, data originate from an NCDC data source
	7: Erroneous, data originate from an NCDC data source
	9: Passed gross limits check if element is present
	

I: WIND-OBSERVATION type code

	The code that denotes the character of the WIND-OBSERVATION. 
	Length:1
	Default Value:9
	Table of Values:

	A: Abridged Beaufort
	B: Beaufort
	C: Calm
	H: 5-Minute Average Speed
	N: Normal
	Q: Squall
	R: 60-Minute Average Speed
	T: 180 Minute Average Speed
	V: Variable
	

SPD: WIND-OBSERVATION speed rate

	The rate of horizontal travel of air past a fixed point. 
	Length:4
	Scale:10
	Unit:Meters per Second
	Default Value:9999

Q: WIND-OBSERVATION speed quality code

	The code that denotes a quality status of a reported WIND-OBSERVATION speed 
	rate. 
	Length:1
	Default Value:9
	Table of Values:

	0: Passed gross limits check
	1: Passed all quality control checks
	2: Suspect
	3: Erroneous
	4: Passed gross limits check , data originate from an NCDC data source
	5: Passed all quality control checks, data originate from an NCDC data source
	6: Suspect, data originate from an NCDC data source
	7: Erroneous, data originate from an NCDC data source
	9: Passed gross limits check if element is present
	

TEMP: AIR-TEMPERATURE-OBSERVATION header
	Length:0

TEMP: AIR-TEMPERATURE-OBSERVATION air temperature

	The temperature of the air. 
	Length:5
	Scale:10
	Unit:Degrees Celsius
	Default Value:+9999

Q: AIR-TEMPERATURE-OBSERVATION air temperature quality code

	The code that denotes a quality status of an AIR-TEMPERATURE-OBSERVATION. 
	
	Length:1
	Default Value:9
	Table of Values:

	0: Passed gross limits check
	1: Passed all quality control checks
	2: Suspect
	3: Erroneous
	4: Passed gross limits check , data originate from an NCDC data source
	5: Passed all quality control checks, data originate from an NCDC data source
	6: Suspect, data originate from an NCDC data source
	7: Erroneous, data originate from an NCDC data source
	9: Passed gross limits check if element is present
	

DEWPT: AIR-TEMPERATURE-OBSERVATION-DEWPOINT header
	Length:0

DEWPT: AIR-TEMPERATURE-OBSERVATION-DEWPOINT temperature

	The temperature to which a given parcel of air must be cooled at constant 
	pressure and water vapor content in order for saturation to occur. 
	Length:5
	Scale:10
	Unit:Degrees Celsius
	Default Value:+9999

Q: AIR-TEMPERATURE-OBSERVATION-DEWPOINT quality code

	The code that denotes a quality status of the reported dew point temperature. 
	
	Length:1
	Default Value:9
	Table of Values:

	0: Passed gross limits check
	1: Passed all quality control checks
	2: Suspect
	3: Erroneous
	4: Passed gross limits check, data originate from an NCDC data source
	5: Passed all quality control checks, data originate from an NCDC data source
	6: Suspect, data originate from an NCDC data source
	7: Erroneous, data originate from an NCDC data source
	9: Passed gross limits check if element is present
	

RHX: RELATIVE-HUMIDITY-CALCULATION header
	Length:3

RHX: RELATIVE-HUMIDITY-CALCULATION computed relative humidity

	new field description 
	Length:3
	Scale:1
	Unit:Percent
	Default Value:999