IDENTIFICATION: Identification header

NAME: Station Name
	
	Length:30

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

	This identifier includes all surface reporting stations, including ships, 
	buoys, etc. 
	Length:6
	Default Value:999999

NCDC: FIXED-WEATHER-STATION NCDC WBAN identifier

	This identifier includes all surface reporting stations. 
	Length:5
	Default Value:99999

DATE: GEOPHYSICAL-POINT-OBSERVATION date

	The date of a GEOPHYSICAL-POINT-OBSERVATION, comprised of integer values 
	0-9 in the format YYYYMMDD. 
	Length:8
	Default Value:99999999

HRMN: GEOPHYSICAL-POINT-OBSERVATION time

	The time of a GEOPHYSICAL-POINT-OBSERVATION based on Coordinated Universal 
	Time Code (UTC). Comprised of integer values 0-9 in the format HHMM. HH 
	is restricted to values 00-23; MM is restricted to values 00-59. 
	Length:4
	Default Value:9999

I: 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 TD3280 (not yet merged, failed element comparison checks)
	2 = TD3280 observation, candidate for merge with DATSAV3 (not yet merged, failed element comparison checks)
	3 = DATSAV3/TD3280 merged observation
	4 = DATSAV3 observation
	5 = TD3280 observation
	A = DATSAV3/TD3240 merged observation, candidate for merge with TD3280 (not yet merged, failed element
	comparison checks)
	B = TD3280/TD3240 merged observation, candidate for merge with DATSAV3 (not yet merged, failed element
	comparison checks)
	C = DATSAV3/TD3280/TD3240 merged observation
	D = DATSAV3/TD3240 merged observation
	E = TD3280/TD3240 merged observation
	

TYPE: GEOPHYSICAL-REPORT-TYPE code

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

	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
	SAO = Airways report (includes record specials)
	SAOSP = Airways special report (excluding record specials)
	AERO = Aerological report
	AUTO = Report from an automatic station
	SY-AE = Synoptic and aero merged report
	SY-SA = Synoptic and airways merged report
	SY-MT = Synoptic and METAR merged report
	SY-AU = Synoptic and auto merged report
	SA-AU = Airways and auto merged report
	S-S-A = Synoptic, airways, and auto merged report
	BOGUS = Bogus report
	SMARS = Supplementary airways station report
	

WIND: Wind header

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

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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        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:

	C: Calm
	N: Normal
	Q: Squall
	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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


TEMP: Temperature header

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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


DEWPT: Dew point header

DEWPT: AIR-TEMPERATURE-OBSERVATION dew point 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 dew point 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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


PRECIP: Precipitation header #1

PR: LIQUID-PRECIPITATION period quantity #1

	The quantity of time over which the LIQUID-PRECIPITATION was measured. 
	
	Length:2
	Scale:1
	Unit:Hours
	Default Value:99

AMT: LIQUID-PRECIPITATION depth/amount #1

	The depth of LIQUID-PRECIPITATION that is measured at the time of an observation. 
	
	Length:4
	Scale:10
	Unit:Millimeters
	Default Value:9999

I: LIQUID-PRECIPITATION condition code #1

	The code that denotes whether a LIQUID-PRECIPITATION amount was a trace 
	value. 
	Length:1
	Default Value:9
	Table of Values:

	1: Measurement impossible or inaccurate
	2: Trace
	

Q: LIQUID-PRECIPITATION quality code #1

	The code that denotes a quality status of the reported LIQUID-PRECIPITATION 
	data. 
	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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


PRECIP: Precipitation header #2

PR: LIQUID-PRECIPITATION period quantity #2

	The quantity of time over which the LIQUID-PRECIPITATION was measured. 
	
	Length:2
	Scale:1
	Unit:Hours
	Default Value:99

AMT: LIQUID-PRECIPITATION depth/amount #2

	The depth of LIQUID-PRECIPITATION that is measured at the time of an observation. 
	
	Length:4
	Scale:10
	Unit:Millimeters
	Default Value:9999

I: LIQUID-PRECIPITATION condition code #2

	The code that denotes whether a LIQUID-PRECIPITATION amount was a trace 
	value. 
	Length:1
	Default Value:9
	Table of Values:

	1: Measurement impossible or inaccurate
	2: Trace
	

Q: LIQUID-PRECIPITATION quality code #2

	The code that denotes a quality status of the reported LIQUID-PRECIPITATION 
	data. 
	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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


PRECIP: Precipitation header #3

PR: LIQUID-PRECIPITATION period quantity #3

	The quantity of time over which the LIQUID-PRECIPITATION was measured. 
	
	Length:2
	Scale:1
	Unit:Hours
	Default Value:99

AMT: LIQUID-PRECIPITATION depth/amount #3

	The depth of LIQUID-PRECIPITATION that is measured at the time of an observation. 
	
	Length:4
	Scale:10
	Unit:Millimeters
	Default Value:9999

I: LIQUID-PRECIPITATION condition code #3

	The code that denotes whether a LIQUID-PRECIPITATION amount was a trace 
	value. 
	Length:1
	Default Value:9
	Table of Values:

	1: Measurement impossible or inaccurate
	2: Trace
	

Q: LIQUID-PRECIPITATION quality code #3

	The code that denotes a quality status of the reported LIQUID-PRECIPITATION 
	data. 
	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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


PRECIP: Precipitation header #4

PR: LIQUID-PRECIPITATION period quantity #4

	The quantity of time over which the LIQUID-PRECIPITATION was measured. 
	
	Length:2
	Scale:1
	Unit:Hours
	Default Value:99

AMT: LIQUID-PRECIPITATION depth/amount #4

	The depth of LIQUID-PRECIPITATION that is measured at the time of an observation. 
	
	Length:4
	Scale:10
	Unit:Millimeters
	Default Value:9999

I: LIQUID-PRECIPITATION condition code #4

	The code that denotes whether a LIQUID-PRECIPITATION amount was a trace 
	value. 
	Length:1
	Default Value:9
	Table of Values:

	1: Measurement impossible or inaccurate
	2: Trace
	

Q: LIQUID-PRECIPITATION quality code #4

	The code that denotes a quality status of the reported LIQUID-PRECIPITATION 
	data. 
	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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


EXT TEMP: Max-min temperature header #1

PR: EXTREME-AIR-TEMPERATURE period quantity #1

	The quantity of time over which temperatures were sampled to determine 
	the EXTREME-AIR-TEMPERATURE. 
	Length:3
	Scale:10
	Unit:Hours
	Default Value:999

I: EXTREME-AIR-TEMPERATURE code #1

	The code that denotes an EXTREME-AIR-TEMPERATURE as a maximum or a minimum. 
	
	Length:1
	Default Value:9
	Table of Values:

	N: Minimum temperature
	M: Maximum temperature
	

TEMP: EXTREME-AIR-TEMPERATURE temperature #1

	The temperature of the high or low air temperature for a given period. 
	
	Length:5
	Scale:10
	Unit:Degrees Celsius
	Default Value:+9999

Q: EXTREME-AIR-TEMPERATURE temperature quality code #1

	The code that denotes a quality status of the reported EXTREME-AIR-TEMPERATURE 
	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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


EXT TEMP: Max-min temperature header #2

PR: EXTREME-AIR-TEMPERATURE period quantity #2

	The quantity of time over which temperatures were sampled to determine 
	the EXTREME-AIR-TEMPERATURE. 
	Length:3
	Scale:10
	Unit:Hours
	Default Value:999

I: EXTREME-AIR-TEMPERATURE code #2

	The code that denotes an EXTREME-AIR-TEMPERATURE as a maximum or a minimum. 
	
	Length:1
	Default Value:9
	Table of Values:

	N: Minimum temperature
	M: Maximum temperature
	

TEMP: EXTREME-AIR-TEMPERATURE temperature #2

	The temperature of the high or low air temperature for a given period. 
	
	Length:5
	Scale:10
	Unit:Degrees Celsius
	Default Value:+9999

Q: EXTREME-AIR-TEMPERATURE temperature quality code #2

	The code that denotes a quality status of the reported EXTREME-AIR-TEMPERATURE 
	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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


PRESSURE: Pressure header

ALT: ATMOSPHERIC-PRESSURE-OBSERVATION altimeter setting

	The pressure value to which an aircraft altimeter is set so that it will 
	indicate the altitude relative to mean sea level of an aircraft on the 
	ground at the location for which the value was determined. 
	Length:5
	Scale:10
	Unit:Hectopascals
	Default Value:99999

Q: ATMOSPHERIC-PRESSURE-OBSERVATION altimeter quality code

	The code that denotes a quality status of an altimeter setting 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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


STP: ATMOSPHERIC-PRESSURE-OBSERVATION station pressure

	The atmospheric pressure at the observation point. 
	Length:5
	Scale:10
	Unit:Hectopascals
	Default Value:99999

Q: ATMOSPHERIC-PRESSURE-OBSERVATION station pressure quality code

	The code that denotes a quality status of the station pressure of an ATMOSPHERIC-PRESSURE-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, from TD3280 or NCDC ASOS/AWOS
        5 = Passed all quality control checks, from TD3280 or NCDC ASOS/AWOS
        6 = Suspect, from TD3280 or NCDC ASOS/AWOS
        7 = Erroneous, from TD3280 or NCDC ASOS/AWOS
        9 = Passed gross limits check if element is present


RHX: Relative Humidity header

RH: RELATIVE-HUMIDITY-CALCULATION computed relative humidity

	The computed relative humidity 
	Length:3
	Scale:1
	Default Value:999
	Table of Values:

	Formula used for calculating relative humidity: 
RH=((6.11*10^(7.5*D/237.7+D))/(6.11*10^(7.5*T/237.3+T))*100