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 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