TEMPERATURE TMPC - Temperature in Celsius TMPF - Temperature in Fahrenheit TMPK - Temperature in Kelvin STHA - Surface potential temperature in Kelvin STHK - Surface potential temperature in Kelvin STHC - Surface potential temperature in Celsius STHE - Surface equivalent potential temperature in Kelvin STHS - Surface saturation equiv. pot. temp. in Kelvin TVRC - Virtual temperature in Celsius TVRF - Virtual temperature in Fahrenheit TVRK - Virtual temperature in Kelvin THTV - Virtual potential temperature in Kelvin TDXC - Maximum 24-hour temperature in Celsius TDNC - Minimum 24-hour temperature in Celsius TDXF - Maximum 24-hour temperature in Fahrenheit TDNF - Minimum 24-hour temperature in Fahrenheit T6XC - Maximum 6-hour temperature in Celsius T6NC - Minimum 6-hour temperature in Celsius T6XF - Maximum 6-hour temperature in Fahrenheit T6NF - Minimum 6-hour temperature in Fahrenheit DMAX - Daily weather map maximum temperature in Fahrenheit DMIN - Daily weather map minimum temperature in Fahrenheit SSTC - Sea surface temperature in Celsius SSTF - Sea surface temperature in Fahrenheit LTMP - Temp. in Celsius of surface air lifted to 500 or !x mb MOISTURE DWPC - Dewpoint in Celsius DWPF - Dewpoint in Fahrenheit DWPK - Dewpoint in Kelvin DPDC - Dewpoint depression Celsius DPDF - Dewpoint depression Fahrenheit DPDK - Dewpoint depression Kelvin SMXR - Surface mixing ratio in g/kg SMXS - Surface saturated mixing ratio in g/kg RELH - Relative humidity in percent TMWK - Wet bulb temperature Kelvin TMWC - Wet bulb temperature Celsius TMWF - Wet bulb temperature Fahrenheit VAPR - Vapor pressure in millibars VAPS - Saturation vapor pressure in millibars PRESSURE AND ALTIMETER PRES - Station pressure in millibars PMSL - Mean sea level pressure in millibars PALT - Pressure in millibars from altimeter ALTI - Altimeter setting in inches of mercury ALTM - Altimeter setting converted to millibars SALT - Abbreviated altimeter in millibars SMSL - Abbreviated mean sea level pressure SALI - Abbreviated ALTI RMSL - First 3 digits left of decimal of PMSL * 10 RSLI - First 3 digits left of decimal of ALTI * 100 RSLT - First 3 digits left of decimal of ALTM * 10 PTND - Complete pressure tendency with symbol PTSY - Pressure tendency symbol only P03C - Pressure change over 3 hours P03D - Pressure tendency and change group, appp P24C - Pressure change over 24 hours ZMSL - Estimated height at PMSL Z000 - Estimated height at 1000 mb Z850 - Estimated height at 850 mb Z800 - Estimated height at 800 mb WIND ARRW - Wind arrow (m/s) ARRM - Wind arrow (m/s) ARRK - Wind arrow (knots) BARB - Wind barb (m/s) BRBM - Wind barb (m/s) BRBK - Wind barb (knots) BRBS - Wind barb (mi/hr) DARR - Wind arrows of uniform length UWND - U component of the wind in meters/second VWND - V component of the wind in meters/second UKNT - U component of the wind in knots VKNT - V component of the wind in knots DRCT - Wind direction in degrees SPED - Wind speed in meters/second SKNT - Wind speed in knots SMPH - Wind speed in miles/hour PSPD - Packed speed and direction (ddfff) in meters/second PKNT - Packed speed and direction (ddfff) in knots GUST - Wind gusts in knots GUMS - Wind gusts in meters/second PWDR - Peak wind direction in degrees PWSP - Peak wind speed in meters/sec PWHR - Hour of peak wind PWMN - Minutes of peak wind CLOUD For the following parameters, the character x may be replaced by L, M, or H, indicating low, middle or high clouds. The character T indicates the value of the parameter at the level of maximum cloud coverage. xCLD - Character cloud coverage TCLD - Character maximum cloud coverage xCLO - Fractional cloud coverage TCLO - Fractional maximum cloud coverage CLCx - Numeric cloud coverage CLCT - Numeric maximum cloud cover CLDS - Combined cloud coverage from three levels CMBC - Numeric combined cloud coverage from three levels CLHx - Cloud height in hundreds of feet CLDx - Combined cloud height and coverage CLDT - Maximum value of CLDx COMx - Numeric combined cloud height and coverage COMT - Maximum value of COMx CEIL - Ceiling in hundreds of feet For the next two cloud parameters the x can be replaced by 1, 2, or 3 and represents the cloud report number. CHCx - Numeric combined cloud height and coverage CHDx - Combined cloud height and short code The following numeric cloud parameters are WMO standard codes. CFRT - Fraction of celestial dome covered by cloud from WMO Code 2700 CFRL - Fraction of celestial dome covered by low or mid clouds from WMO Code 2700 CTYL - Low-level cloud genera from WMO Code 0513 CTYM - Mid-level cloud genera from WMO Code 0515 CTYH - High-level cloud genera from WMO Code 0509 CBAS - Cloud base height from WMO Code 1600 CSYL - Low cloud type symbol CSYM - Middle cloud type symbol CSYH - High cloud type symbol CSYT - Cloud type symbol on first reported level SKYC - Sky coverage symbol SKYM - Sky coverage symbol with wind barbs in m/s SKYK - Sky coverage symbol with wind barbs in knots The following numeric parameter follows the guidelines in the National Weather Service Operations Manual, Chapter D-31. XVFR - Categorical identification of flight rules 0 = Low Instrument Flight Rules (LIFR) 1 = Instrument Flight Rules (IFR) 2 = Marginal Visual Flight Rules (MVFR) 3 = Visual Flight Rules (VFR) WEATHER WTHR - Character weather code from any numeric code WCOD - Character weather code WNUM - Numeric weather code WSYM - Present weather symbol WTMO - Character weather code from WMO WWMO - Numeric WMO weather code PWTH - Past weather symbol PWWM - Numeric past weather in WMO code STATION VARIABLES STID - Character station identifier STNM - 5-digit station identifier SLAT - Station latitude in degrees SLON - Station longitude in degrees, West is negative SELV - Station elevation in meters SPRI - Station priority MODEL OUTPUT STATISTICS MXMN - Maximum or minimum temperature in Fahrenheit TNTF - Night temperature fcst in Fahrenheit TNCF - Night temperature climatology in Fahrenheit TNAF - Night temperature anomaly in Fahrenheit TDYF - Day temperature fcst in Fahrenheit TDCF - Day temperature climatology in Fahrenheit TDAF - Day temperature anomaly in Fahrenheit TCNT - Night cloud coverage fcst TCDY - Day cloud coverage fcst CL12 - Prevailing total sky cover fcst for a 12-hr period 1 = CL = mostly clear 4 = OV = mostly overcast 7 = PC = mixed clouds and clear skies SKNN - Night wind speed fcst in knots SKND - Day wind speed fcst in knots SK12 - Maximum sustained surface wind speed fcst for a 12-hr period 5 = light 0 - 12 knots 15 = Moderate 13 - 21 knots 25 = Strong 22 - 33 knots 40 = High greater than or equal to 34 knots PP06 - Probability of precipitation fcst in a 6-hr period PP12 - Probability of precipitation fcst in a 12-hr period PP1C - Probability of precipitation climatology in a 12-hr period PP1A - Probability of precipitation anomaly in a 12-hr period PPNT - Probability of precipitation fcst for night PPNC - Probability of precipitation climatology for night PPNA - Probability of precipitation anomaly for night PPDY - Probability of precipitation fcst for day PPDC - Probability of precipitation climatology for day PPDA - Probability of precipitation anomaly for day PP24 - Probability of precipitation fcst in a 24-hr period PP2C - Probability of precipitation climatology in a 24-hr period PP2A - Probability of precipitation anomaly in a 24-hr period QP06 - Quantitative precipitation fcst in a 6-hr period 1 = 0.01 - 0.09 inches 2 = 0.10 - 0.24 inches 3 = 0.25 - 0.49 inches 4 = 0.50 - 0.99 inches 5 = 1.00 - 1.99 inches QP12 - Quantitative precipitation fcst in a 12-hr period 0 = no precipitation expected 1 through 5 same as QP06 6 = greater than or equal to 2.00 inches QP24 - Quantitative precipitation fcst in a 24-hr period 0 through 5 same as QP12 6 = 2.00 - 2.99 inches 7 = greater than or equal to 3.00 inches TS06 - Unconditional probability of thunderstorms occurring in a 6-hr period TS12 - Unconditional probability of thunderstorms occurring in a 12-hr period TS24 - Unconditional probability of thunderstorms occurring in a 24-hr period TC06 - Conditional probability of severe weather occurring in a 6-hr period TC12 - Conditional probability of severe weather occurring in a 12-hr period PCPT - Categorical forecast of precipitation 0 = R = rain 1 = S = snow 2 = Z = freezing POZP - Conditional probability of freezing precipitation (not included during the warm season) POSN - Conditional probability of snow (not included during the warm season) PSNT - Conditional probability of snow for night (not included during the warm season) PSDY - Conditional probability of snow for day (not included during the warm season) SN06 - Categorical forecast of snow amount falling in a 6-hr period 0 = no snow 1 = trace to less than 2 inches 2 = greater than or equal to 2 inches SN12 - Categorical forecast of snow amount falling in a 12-hr period 0 and 1 same as SN06 2 = 2 to less than 4 inches 4 = 4 to less than 6 inches 6 = greater than 6 inches (not included during the warm season) SN24 - Categorical forecast of snow amount falling in a 24-hr period 0 = no snow or a trace 1 = greater than a trace to less than 2 inches 2 = 2 to less than 4 inches 4 = 4 to less than 6 inches 6 = 6 to less than 8 inches 8 = greater than 8 inches (not included during the warm season) PZ12 - Conditional probability of freezing precipitation in a 12-hr period PS12 - Conditional probability of snow in a 12-hr period PR12 - Conditional probability of mixed liquid/frozen precipitation in a 12-hr period PC12 - Categorical forecast of precipitation type in a 12-hr period 0 = R = liquid 1 = S = frozen 2 = Z = freezing 3 = RS = mixed liquid and frozen precipitation 4 = RZ 5 = SZ 6 = RSZ FCIG - Categorical forecast of ceiling height conditions 1 = less than 200 feet 2 = 200 - 400 feet 3 = 500 - 900 feet 4 = 1000 - 3000 feet 5 = 3100 - 6500 feet 6 = 6600 - 12,000 feet 7 = greater than 12,000 feet FVIS - Categorical forecast of visibility conditions 1 = less than 0.5 miles 2 = 0.5 - 0.875 miles 3 = 1.0 - 2.75 miles 4 = 3.0 - 5.0 miles 5 = greater than 5.0 miles FVSA - Categorical forecast of visibility conditions (for new MOS) 1 = less than 0.25 miles 2 = 0.25 to less than .5 mile 3 = .5 mile to less than 1.0 mile 4 = 1.0 to less than 3.0 miles 5 = 3.0 to 5.0 miles 6 = 6.0 miles 7 = greater than 6.0 miles OVIS - Categorical forecast in plain language of obstructions to vision 0 = N = none of the following 1 = FG or F = fog or ground fog (vis. less than .625 mile) 2 = HZ or H = haze, smoke, dust 3 = BR = mist (fog with visibility greater than .625 mile) 4 = BL = blowing dust, sand, snow MARINE WHGT - Wave height in meters WHFT - Wave height in feet WPER - Wave period in seconds HOWW - Height of wind wave in meters POWW - Period of wind wave in seconds HOSW - Height of predominant swell wave in meters POSW - Period of predominant swell wave in seconds DOSW - Direction of predominant swell wave in degrees HOS2 - Height of secondary swell wave in meters POS2 - Period of secondary swell wave in seconds DOS2 - Direction of secondary swell wave in degrees WAV2 - Combined wind wave period and height in feet ("2 group") WAV3 - Combined predominant and secondary swell wave direction in tens of degrees ("3 group") WAV4 - Combined predominant swell wave period and height in feet ("4 group") WAV5 - Combined secondary swell wave period and height in feet ("5 group") WPHM - Combined wave period and height in half meters WVSW - Combined swell wave direction, period and height in half meters SWEL - Character combined swell wave direction, period and height in half meters DAWV - Swell wave direction arrows of uniform length IDTH - Thickness of ice on ship in meters ROIA - Rate of ice accretion on ship from WMO code table 3551 IGRO - Rate of ice accretion on vessel in salt water in inches per 3 hours DIGR - Character rate of ice accretion in inches per three hours SHPD - True direction from which ship is moving (for 3 hours before obs) in degrees SHPK - Ship's average speed (for 3 hours before obs) in knots DASH - Ship's true direction arrows of uniform length AIRCRAFT TURB - Amount of turbulence TBSE - Base of turbulence in feet TTOP - Top of turbulence in feet HBOT - Base of turbulence in meters HTOT - Top of turbulence in meters FQOT - Frequency of turbulence TPOT - Type of turbulence TBSY - Turbulence symbol ICNG - Amount of airframe icing IBSE - Base of icing in feet ITOP - Top of icing in feet HBOI - Base of icing in meters HTOI - Top of icing in meters TPOI - Type of icing ICSY - Icing symbol WBSE - Base of weather in feet WTOP - Top of weather in feet HBWX - Base of weather in meters HTWX - Top of weather in meters CLC1 - Numeric cloud coverage 1 CBS1 - Cloud base 1 in feet CTP1 - Cloud top 1 in feet CB1M - Cloud base 1 in meters CT1M - Cloud top 1 in meters CLC2 - Numeric cloud coverage 2 CBS2 - Cloud base 2 in feet CTP2 - Cloud top 2 in feet CB2M - Cloud base 2 in meters CT2M - Cloud top 2 in meters ACRT - Aircraft report type SELV - Flight level in meters FELV - Flight level in hundreds of feet ITSY - Icing type symbol TTSY - Turbulence type symbol TFSY - Turbulence frequency symbol ACTP - Character aircraft type ATP1 - Numeric aircraft type MISCELLANEOUS DDEN - Density of dry air in kg/(m**3) VSBY - Visibility in statute miles VSBK - Visibility in kilometers VSBN - Visibility in nautical miles VSBF - Character visibility in fractions of statute miles for visibilities between 0. and 1. VSBC - Character visibility in fractions of statute miles for all visibility numbers PnnI - Precipitation over last nn hours in inches nn = 01, 03, 06, 09, 12, 18 or 24 PnnM - Precipitation over last nn hours in millimeters nn = 01, 03, 06, 09, 12, 18 or 24 DPRC - Character daily weather map precipitation in inches PR24 - Precipitation over last 24 hours in inches, as sum of four successive 6-hour precip amounts SNOW - Snow depth in inches SNEW - Amount of new snow in inches SNRT - Forecast snow and ice pellet accumulation to watch threshold ratio SI12 - Forecast snow and ice pellet 12-h accumulation in inches SNIP - Snow and ice pellet watch threshold in inches FZRT - Forecast freezing rain accumulation to watch threshold ratio FZ12 - Forecast Freezing rain 12-h accumulation in inches FZRN - Freezing rain watch threshold in inches WEQS - Water equivalent of snow on the ground in inches HAIL - Hail flag HLSZ - Hail size in centimeters HEAT - Heat index in Fahrenheit HMTR - Humiture (apparent temperature) in Fahrenheit WCEQ - Wind chill equivalent temperature in Fahrenheit WCHT - Revised wind chill temperature in Fahrenheit MSUN - Duration of sunshine in minutes FFnn - Flash flood guidance for next nn hours in inches nn = 01, 03, 06, 12 or 24 TOST - Type of station (manned or automatic) 0 = automatic 1 = manned STIM - Report hour and minutes as hhmm TEXT - Undecoded data SPCL - Undecoded special reports MARK - Markers SPACING SPAC - Plot a space, accounted for in FILTER BLNK - Plot a blank, not accounted for in FILTER