![]() |
KEY TO DECODING THE U.S. METAR OBSERVATION REPORT |
Example METAR Report
METAR KABC 121755Z AUTO 21016G24KT 180V240 1SM R11/P6000FT -RA BR BKN015 0VC025 06/04 A2990 RMK A02 PK WND 20032/25 WSHFT 1715 VIS 3/4V1 1/2 VIS 3/4 RWY11 RAB07 CIG 013V017 CIG 017 RWY11 PRESFR SLP125 POOO3 6OOO9 T00640036 10066 21012 58033 TSNO $
See
Observing and Coding Present Weather Group for
additional information.
KEY TO DECODING A METAR REPORT
METAR TYPE OF
REPORT METAR: hourly (scheduled) report; SPECI:
special (unscheduled) report.
KABC ICAO STATION (location)
IDENTIFIER Four character ICAO location identifier.
121755Z DATE/TIME group
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.
AUTO REPORT MODIFIER
AUTO: Indicates a fully automated report with no human
intervention. It is removed when an observer logs on to the system. COR:
Indicates a corrected observation. No modifier indicates human observer or
automated system with human logged on for oversight functions.
21016G24KT 180V240 WIND
DIRECTION AND SPEED Direction in tens of degrees from true
north (first three digits); next two digits: speed in whole knots; if needed,
include character as:
Gusts (character) followed by maximum observed speed; always
appended with KT to indicate knots; 00000KT for calm; if
direction varies by 60o or more and speed greater than 6 knots,
a Variable wind
direction group is reported, otherwise omitted. If wind direction is variable
and speed 6 knots or less, replace wind direction with VRB followed by
wind speed in knots. Observing and Coding Wind for
additional information.
1SM VISIBILITY
Prevailing visibility in statute miles and fractions with space
between whole miles and fractions; always appended with SM to
indicate statute miles; values <1/4SM reported as M1/4SM.
See
Observing and Coding Visibility for additional
information.
R11/P6000FT RUNWAY
VISUAL
RANGE A 10-minute RVR evaluation value in hundreds of feet
is reported if prevailing visibility is < or = 1 mile or RVR < or = 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. See
Observing and Coding Runway Visual Range for
additional information.
-RA BR
WEATHER PHENOMENA
Present weather:
QUALIFIER
Intensity or Proximity
- Light "no sign" Moderate + Heavy
VC Vicinity: but not at
aerodrome; in U.S. METAR, between 5SM and 10SM of the point(s) of
observation.
Descriptor
MI Shallow
BL Blowing BC
Patches
SH showersPR Partial
DR DriftingTS
Thunderstorm
FZ Freezing
WEATHER PHENOMENA
Precipitation
DZ Drizzle
IC Ice Crystals
UP Unknown
in automated
observationsRA Rain
PL Ice
pelletsSN Snow
GR HailSG Snow grains
GS Small hail/
snow pelletsObscuration
BR Mist (< or = 5/8SM)
SA SandFU
Smoke
HZ HazeVA Volcanic Ash
PY SprayDU Widespread Dust
Other
SQ Squall
FC Funnel CloudSS Sandstorm
+FC Tornado/
WaterspoutDS Duststorm
PO Well developed
dust/sand whirls
BKN015 OVC025
SKY CONDITION
Cloud amount and height: CLR (In automated METAR reports only,
no clouds detected below 12000 feet.); SKy Clear 0/8;
FEW 1/8-2/8; SCattered
3/8-4/8; BroKeN 5/8-7/8;
OVerCast 8/8; 3-digit height of base in
hundreds of feet; followed by Towering
CUmulus or CumulonimBus if
present. For an observed sky: Vertical
Visibility followed by vertical veisibility in hundreds of
feet into the obscuration, example: VV004. More than 1
layer may be reported.
See
Observing and Coding Sky Conditions for
additional information.
06/04
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).
See
Observing and Coding Temperature and
Dew Point for additional information.
A2990
ALTIMETER
Altimeter setting (in U.S. reports) is always prefixed with an
A indicating inches of mercury; reported using four digits: tens,
units, tenths, and hundredths.
See
Observing and Coding Pressure for
additional information.
The following groups are reported in the
Remarks section of the METAR report
RMK
REMARKS IDENTIFIER
Remarks includes clarifying or augmenting data concerning
elements in the body of the METAR, additive coded data and maintenance data.
TORNADO, FUNNEL CLOUD or WATERSPOUT
TORNADIC ACTIVITY
Augmented; report should include TORNADO, FUNNEL CLOUD or
WATERSPOUT, time (after the hour) of beginning/end, location, movement; e.g.,
TORNADO B25 N MOVE E
See
Observing and Coding Remarks for
additional information.
AO2
TYPE OF AUTOMATED STATION
AO1; automated station without a precipitation descriminator.
AO2; automated station with precipitation descriminator.
See
Observing and Coding Remarks for
additional information.
PK WND 20032/25
PEAK WIND
PK WND dddff(F)/(hh)mm; direction in tens of degrees, speed in
whole knots, time in minutes after the hour. Only minutes after the hour is
included if the hour can be inferred from the report.
See
Observing and Coding Remarks for
additional information.
WSHFT 1715
WIND SHIFT
WSHFT followed by hours and minutes of occurrence. The term
FROPA may be entered after the time if it is reasonably certain that the
wind shift was a result of a frontal passage.
See
Observing and Coding Remarks for
additional information and here for wind
definitions.
Not on this report
TOWER OR SURFACE VISIBILITY
TWR VIS vvvvv: visibility reported by tower personnel,
e.g., TWR VIS 2; SFC VIS vvvvv: visibility reported by ASOS or observer.
See
Observing and Coding Remarks for
additional information and here for visibility
criteria and definitions..
VIS 3/4V1 1/2
VARIABLE PREVAILING VISIBILITY
VIS vnvnvnvn
vnVvxvxvx
vxvx; reported if prevailing visibility is <3 statute
miles and variable.
See
Observing and Coding Remarks for
additional information and here for visibility
criteria and definitions.
VIS 3/4 RWY11
VISIBILITY AT SECOND LOCATION
VIS vvvvv(LOC); reported if different than the reported
prevailing visibility in the body of the report.
See
Observing and Coding Remarks for
additional information and here for visibility
criteria and definitions.
Not on this report
LIGHTNING
(FREQUENCY) LTG (LOCATION); when detected the frequency and
location is reported, e.g., FRQ LTG NE, meaning frequent lightning to northeast
of station.
See
Observing and Coding Remarks for
additional information.
RAB07
BEGINNING AND ENDING OF PRECIPITATION AND
THUNDERSTORMS
w'w'B(hh)mmE(hh)mm; TSB(hh)mmE(hh)mm, where w'w' is the present
weather precipitation contraction, B indicates began, E indicates ended; (hh)
indicates the hour the phenomena began or ended and can be omitted if the hour
can be inferred from the report, mm indicates the minutes after the hour the
phenomenon began or ended.
See
Observing and Coding Remarks for
additional information.
Not on this report
VIRGA
Augmented to report by human observer; indicates precipitation
not reaching the ground is observed.
See
Observing and Coding Remarks for
additional information.
CIG 013V017
VARIABLE CEILING
CIG hnhnhnVhx
hxhx;
reported if the ceiling in the body of the
report is < 3000 feet and variable. See
Observing and Coding Remarks for
additional information.
CIG 017 RWY11
CEILING HEIGHT AT SECOND LOCATION
CIG hhh[LOC]; Ceiling height reported if secondary
ceilometer site ceiling value is different than the ceiling height in the body
of the report. See
Observing and Coding Remarks for
additional information and here for sky condition
criteria and definitions.
PRESFR
PRESSURE RISING OR FALLING RAPIDLY
PRESRR or PRESFR; pressure rising or falling rapidly at time
of observation. See
Observing and Coding Remarks for
additional information and here for pressure
criteria and definitions.
SLP125
SEA LEVEL PRESSURE
SLPppp; sea level pressure reported for ppp in tens, units, and
tenths of hPa. See
Observing and Coding Remarks for
additional information and here for pressure
criteria and definitions.
P0003
HOURLY PRECIPITATION AMOUNT
Prrrr; in tens, units, tenths and hundredths of an inch since
last regular hourly METAR. A trace is reported as P0000. See
Observing and Coding Remarks for
additional information.
60009
3- AND 6-HOUR PRECIPITATION AMOUNT
6RRRR; precipitation amount, including water equivalent, to
nearest 0.01 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. See
Observing and Coding Remarks for
additional information.
Not on this report
24-HOUR PRECIPITATION AMOUNT
7R24R24R24R24;
precipitation amount to nearest 0.01 inches for past 24 hours reported in
12 UTC observation; e.g., 70015 indicates 0.15 inches of precipitation for
past 24 hours. See
Observing and Coding Remarks for
additional information.
T00640036
HOURLY TEMPERATURE AND DEW POINT
TsnTaTaTa
snT'aT'aT'a; reported to nearest
tenth of oC; sn: 1 if temperature or dew point below
0oC and 0 if temperature/dew point 0oC or higher. See
Observing and Coding Remarks for
additional information.
10066
6-HOUR MAXIMUM TEMPERATURE
1snTxTxTx; maximum
temperature for past 6 hours reported to nearest tenth of degree Celsius;
reported on 00, 06, 12, 18 UTC reports; sn = 1 if temperature
below 0oC and 0 if temperature 0oC or higher.. See
Observing and Coding Remarks for
additional information.
21012
6-HOUR MINIMUM TEMPERATURE
2snTnTnTn; minimum
temperature for past 6 hours reported to nearest tenth of degree Celsius;
reported on 00, 06, 12, 18 UTC reports; sn = 1 if temperature
below 0oC and 0 if temperature 0oC or higher.. See
Observing and Coding Remarks for
additional information.
Not on this report
24-HOUR MAXIMUM AND MINIMUM TEMPERATURE
4snTxTx
TxsnTnTnTn; maximum
temperature for past 6 hours reported to nearest tenth of degree Celsius;
reported on midnight local standard time reports; sn = 1 if
temperature below 0oC and 0 if temperature 0oC or higher;
e.g., 400461006 indicates a 24-hour maximum temperature of 4.6oC and
a 24-hour minimum temperature of -0.6oC. See
Observing and Coding Remarks for
additional information.
58033
PRESSURE TENDENCY
5appp; the character (a) and amount of change in pressure (ppp) in
tenths of hPa for the past 3 hours. See
Observing and Coding Remarks for
additional information.
TSNO
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 (may
indicate augmenting weather observer not logged on); VISNO [LOC} visibility at
second location not available, e.g. VISNO RWY06; CHINO [LOC}: (cloud-height-
indicator) sky condition at secondary location not available, e.g.,
CHINO RWY06. See
Observing and Coding Remarks for
additional information.
$
MAINTENANCE CHECK INDICATOR
Maintenance is needed on the system. See
Observing and Coding Remarks for
additional information.
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.