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weather reporting and forecasting. The utilization of
terminal forecasts affirms our commitment to a single
global format for aviation weather. The World
Meteorological Organization’s (WMO) publication
No. 782 “Aerodrome Reports and Forecasts”
contains the base METAR and TAF code as adopted
by the WMO member countries.
a. Although the METAR code is adopted
worldwide, each country is allowed to make
modifications or exceptions to the code for use in
their particular country, e.g., the U.S. will continue to
use statute miles for visibility, feet for RVR values,
knots for wind speed, and inches of mercury for
altimetry. However, temperature and dew point will
be reported in degrees Celsius. The U.S. will continue
reporting prevailing visibility rather than lowest
sector visibility. Most of the current U.S. observing
procedures and policies will continue after the
METAR conversion date, with the information
disseminated in the METAR code and format. The
elements in the body of a METAR report are
separated with a space. The only exceptions are RVR,
temperature and dew point, which are separated with
a solidus (/). When an element does not occur, or
cannot be observed, the preceding space and that
element are omitted from that particular report. A
METAR report contains the following sequence of
elements in the following order:
1. Type of report.
2. ICAO Station Identifier.
3. Date and time of report.
4. Modifier (as required).
5. Wind.
6. Visibility.
7. Runway Visual Range (RVR).
8. Weather phenomena.
9. Sky conditions.
10. Temperature/dew point group.
11. Altimeter.
12. Remarks (RMK).
b. The following paragraphs describe the elements
in a METAR report.
1. Type of report. There are two types of
report:
(a) Aviation Routine Weather Report
(METAR); and
(b) Nonroutine (Special) Aviation Weather
Report (SPECI).
The type of report (METAR or SPECI) will always
appear as the lead element of the report.
2. ICAO Station Identifier. The METAR
code uses ICAO 4−letter station identifiers. In the
contiguous 48 States, the 3−letter domestic station
identifier is prefixed with a “K;” i.e., the domestic
identifier for Seattle is SEA while the ICAO identifier
is KSEA. Elsewhere, the first two letters of the ICAO
identifier indicate what region of the world and
country (or state) the station is in. For Alaska, all
station identifiers start with “PA;” for Hawaii, all
station identifiers start with “PH.” Canadian station
identifiers start with “CU,” “CW,” “CY,” and “CZ.”
Mexican station identifiers start with “MM.” The
identifier for the western Caribbean is “M” followed
by the individual country’s letter; i.e., Cuba is “MU;”
Dominican Republic “MD;” the Bahamas “MY.” The
identifier for the eastern Caribbean is “T” followed
by the individual country’s letter; i.e., Puerto Rico is
“TJ.” For a complete worldwide listing see ICAO
Document 7910, Location Indicators.
3. Date and Time of Report. The date and
time the observation is taken are transmitted as a
six−digit date/time group appended with Z to denote
Coordinated Universal Time (UTC). The first two
digits are the date followed with two digits for hour
and two digits for minutes.
EXAMPLE−
172345Z (the 17th day of the month at 2345Z)
4. Modifier (As Required). “AUTO” identifies
a METAR/SPECI report as an automated weather
report with no human intervention. If “AUTO” is
shown in the body of the report, the type of sensor
equipment used at the station will be encoded in the
remarks section of the report. The absence of
“AUTO” indicates that a report was made manually
by an observer or that an automated report had human
augmentation/backup. The modifier “COR” indicates
a corrected report that is sent out to replace an
earlier report with an error.
2/17/05 AIM
Meteorology 7−1−61
NOTE−
There are two types of automated stations, AO1 for
automated weather reporting stations without a
precipitation discriminator, and AO2 for automated
stations with a precipitation discriminator. (A precipitation
discriminator can determine the difference between liquid
and frozen/freezing precipitation). This information
appears in the remarks section of an automated report.
　
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