Piper Aircraft, Inc.
>INDEX   >DATABASES   >Wx TEXT   >RADAR   >Wx MAPS   >SATELLITE   >NEWS   >REFERENCE   >AIRLINES   >HOTELS   >CAR RENTAL LAST UPDATE JANUARY 1, 2010  


METAR Reference Chart
Download this chart to print. (Word .doc) 38K

KEY TO DECODE AN ASOS (METAR) OBSERVATION
METAR KABC 121755Z AUTO 21016G24KT 180V240 1SM R11/P6000FT -RA BR BKN015 OVC025 06/04 A2990 RMK AO2 PK WND 20032/25 WSHFT 1715 VIS 3/4V1 1/2 VIS 3/4 RWY11 RAB07 CIG 013V017 CIG 017 RWY11 PRESFR SLP125 P0003 60009 T00640036 10066 21012 58033 TSNO $
TYPE OF REPORT METAR: hourly (scheduled) report; SPECI: special (unscheduled) report. METAR
STATION IDENTIFIER Four alphabetic characters; ICAO location identifier. KABC
DATE/TIME All dates and times in UTC using a 24-hour clock; two-digit date and four-digit time; always appended with Z to indicate UTC. 121755Z
REPORT MODIFIER Fully automated report, no human intervention; removed when observer signed-on. AUTO
WIND DIRECTION AND SPEED Direction in tens of degrees from true north (first three digits); next two digits: speed in whole knots; as needed Gusts (character) followed by maximum observed speed; always appended with KT to indicate knots; 00000KT for calm; if direction varies by 60° or more a Variable wind direction group is reported. 21016G24KT

180V240
VISIBILITY Prevailing visibility in statute miles and fractions (space between whole miles and fractions); always appended with SM to indicate statute miles; values <1/4 reported as M1/4. 1SM
RUNWAY VISUAL RANGE 10-minute RVR value in hundreds of feet; reported if prevailing visibility is one mile or RVR 6000 feet; always appended with FT to indicate feet; value prefixed with M or P to indicate value is lower or higher than the reportable RVR value. R11/P6000FT
WEATHER PHENOMENA RA: liquid precipitation that does not freeze; SN: frozen precipitation other than hail; UP: precipitation of unknown type; intensity prefixed to precipitation: light (-), moderate (no sign), heavy (+); FG: fog; FZFG: freezing fog (temperature below 0°C); BR: mist; HZ: haze; SQ: squall; maximum of three groups reported; augmented by observer: FC (funnel cloud/tornado/waterspout); TS (thunderstorm); GR (hail); GS (small hail; <1/4 inch); FZRA (intensity; freezing rain); VA (volcanic ash). -RA BR
SKY CONDITION Cloud amount and height: CLR (no clouds detected below 12000 feet); FEW (few); SCT (scattered); BKN (broken); OVC (overcast); followed by 3-digit height in hundreds of feet; or vertical visibility (VV) followed by height for indefinite ceiling. BKN015 OVC025
TEMPERATURE/DEW POINT Each is reported in whole degrees Celsius using two digits; values are separated by a solidus; sub-zero values are prefixed with an M (minus). 06/04
ALTIMETER Altimeter always prefixed with an A indicating inches of mercury; reported using four digits: tens, units, tenths, and hundredths. A2990


REMARKS ON REVERSE SIDE

REMARKS IDENTIFIER:   RMK RMK
TORNADIC ACTIVITY:   Augmented; report should include TORNADO, FUNNEL CLOUD, or WATERSPOUT, time begin/end, location, movement; e.g. TORNADO B25 N MOV E.
TYPE OF AUTOMATED STATION:   AO2; automated station with precipitation discriminator. AO2
PEAK WIND:   PK WND dddff(f)/(hh)mm; direction in tens of degrees, speed in whole knots, and time. PK WND 20032/25
WIND SHIFT:   WSHFT (hh)mm WSHFT 1715
TOWER OR SURFACE VISIBILITY:   TWR VIS vvvvv: visibility reported by tower personnel, e.g., TWR VIS 2; SFC VIS vvvvv: visibility reported by ASOS, e.g. SFC VIS 2
VARIABLE PREVAILING VISIBILITY:   VIS vnvnvnvnvnVv xvxvxvxvx; reported if prevailing visibility is < 3 miles and variable. VIS 3/4V1 1/2
VISIBILITY AT SECOND LOCATION:   VIS vvvvv [LOC]; reported if different than the reported prevailing visibility in body of report. VIS 3/4 RWY11
LIGHTNING:   [FREQ] LTG [LOC]; when detected the frequency and location is reported, e.g. FRQ LTG NE.
BEGINNING AND ENDING OF PRECIPITATION AND THUNDERSTORMS:   w'w'B(hh)mmE(hh)mm; TSB(hh)mmE(hh)mm RAB07
VIRGA:   Augmented; precipitation not reaching the ground, e.g. VIRGA
VARIABLE CEILING HEIGHT:   CIG hn hnhnVhxhxhx; reported if ceiling in body of report is < 3000 feet and variable. CIG 013V017
CEILING HEIGHT AT SECOND LOCATION:   CIG hhh [LOC]; Ceiling height reported if secondary ceilometer site is different than the ceiling height in the body of the report. CIG 017 RWY11
PRESSURE RISING OR FALLING RAPIDLY:   PRESRR or PRESFR; pressure rising or falling rapidly at time of observation. PRESFR
SEA-LEVEL PRESSURE:   SLPppp; tens, units, and tenths of SLP in hPa. SLP125
HOURLY PRECIPITATION AMOUNT:   Prrrr; in .01 inches since last METAR; a trace is P0000. P0003
3- AND 6-HOUR PRECIPITATION AMOUNT:   6RRRR; precipitation amount in .01 inches for past 6 hours reported in 00, 06, 12, and 18 UTC observations and for past 3 hours in 03, 09, 15, and 21 UTC observations; a trace is 60000. 60009
24-HOUR PRECIPITATION AMOUNT:   7R24 R24R24R24; precipitation amount in .01 inches for past 24 hours reported in 12 UTC observation. 70015
HOURLY TEMPERATURE AND DEW POINT:   Tsn TaTaTasnT'a T'aT'a; tenth of degree Celsius; sn: 1 if temperature below 0°C and 0 if temperature 0°C or higher. T00640036
6-HOUR MAXIMUM TEMPERATURE:   1sn TxTxTx; tenth of degree Celsius; 00, 06, 12, 18 UTC; sn: 1 if temperature below 0°C and 0 if temperature 0°C or higher. 10066
6-HOUR MINIMUM TEMPERATURE:   2sn TnTnTn; tenth of degree Celsius; 00, 06, 12, 18 UTC; sn: 1 if temperature below 0°C and 0 if temperature 0°C or higher. 21012
24-HOUR MAXIMUM AND MINIMUM TEMPERATURE:    4snTxTxTxsn TnTnTn; tenth of degree Celsius; reported at midnight local standard time; 1 if temperature below 0°C and 0 if temperature 0°C or higher, e.g. 400461006
PRESSURE TENDENCY:   5appp; the character (a) and change in pressure (ppp; tenths of hPa) the past 3 hours. 58033
SENSOR STATUS INDICATORS:   RVRNO: RVR missing; PWINO: precipitation identifier information not available; PNO: precipitation amount not available; FZRANO: freezing rain information not available; TSNO: thunderstorm information not available; VISNO [LOC]: visibility at secondary location not available, e.g., VISNO RWY06; CHINO [LOC]: (cloud-height-indicator) sky condition at secondary location not available, e.g., CHINO RWY06. TSNO
MAINTENANCE CHECK INDICATOR:   Maintenance needed on the system. $
If an element or phenomena does not occur, is missing, or cannot be observed, the corresponding group and space are omitted (body and/or remarks) from that particular report, except for Sea-Level Pressure (SLPppp). SLPNO shall be reported in a METAR when the SLP is not available.

U.S. DEPARTMENT OF COMMERCE - NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION - National Weather Service - Observing Systems Branch, 1325 East-West Highway, Silver Spring, Maryland 20910 METAR\TA


RETURN TO HOME PAGE


Disclaimer: No warranty or claims are made or implied regarding the accuracy or worthiness of the information, databases, and sites included or linked to via this site. The forecast information provided by the weather sites listed here should not used for preflight planning or in lieu of officially disseminated weather forecasts and warnings. Inclusion of a site on these pages does not constitute an endorsement of goods or services provided by a firm or company.


      Piper Aircraft, Inc.
      Air Safety Investigation
      Send comments and suggestions to:
      ASIResource@sbcglobal.net
      Copyright © 1996 - 2016 Piper Aircraft, Inc.
      All rights reserved.
Piper Aircraft, Inc.