METAR

SPECIaviation flight categoryaviationhourly weather forecastsMETAR reportNOSIGobservationsweather information
METAR is a format for reporting weather information.wikipedia
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Automated airport weather station

AWOSAutomated Surface Observing SystemASOS
Some METARs are encoded by automated airport weather stations located at airports, military bases, and other sites.
In the United States, the AWOS/ASOS Data Acquisition System (ADAS), a computer system run by the FAA, polls the systems remotely, accessing the observations and disseminating them worldwide electronically in METAR format.

Visibility

zero visibilityvisibilitiesa good day
A typical METAR contains data for the temperature, dew point, wind direction and speed, precipitation, cloud cover and heights, visibility, and barometric pressure.
It is reported within surface weather observations and METAR code either in meters or statute miles, depending upon the country.

Weather forecasting

weather forecastweather forecastsweatherman
A METAR weather report is predominantly used by aircraft pilots, and by meteorologists, who use aggregated METAR information to assist in weather forecasting.
Stations either report hourly in METAR reports, or every six hours in SYNOP reports.

Terminal aerodrome forecast

TAFforecastsTAFOR
These are in the same format as a Terminal Aerodrome Forecast (TAF).
TAFs complement and use similar encoding to METAR reports.

Weather station

meteorological stationweather stationspersonal weather stations
METARs typically come from airports or permanent weather observation stations.
Automatic transmission of data, in a format such as METAR, is also desirable as many weather station's data is required for weather forecasting.

Precipitation

rainfallhydrometeorannual precipitation
A typical METAR contains data for the temperature, dew point, wind direction and speed, precipitation, cloud cover and heights, visibility, and barometric pressure.
The METAR code for ice pellets is PL.

Atmospheric pressure

barometric pressureair pressurepressure
A typical METAR contains data for the temperature, dew point, wind direction and speed, precipitation, cloud cover and heights, visibility, and barometric pressure.
In aviation, weather reports (METAR), QNH is transmitted around the world in millibars or hectopascals (1 hectopascal = 1 millibar), except in the United States, Canada, and Colombia where it is reported in inches of mercury (to two decimal places).

Airport

airportsPublicairstrip
METARs typically come from airports or permanent weather observation stations.
These weather observations, predominantly in the METAR format, are available over the radio, through automatic terminal information service (ATIS), via the ATC or the flight service station.

VOLMET

RAF VOLMET
METARs and TAFs are used in VOLMET broadcasts.
VOLMET (French origin vol (flight) and météo (weather report)), or meteorological information for aircraft in flight, is a worldwide network of radio stations that broadcast TAF, SIGMET and METAR reports on shortwave frequencies, and in some countries on VHF too.

Colour state

A METAR may also contain information on precipitation amounts, lightning, and other information that would be of interest to pilots or meteorologists such as a pilot report or PIREP, colour states and runway visual range (RVR).
The colour state may be appended to a METAR report.

Runway visual range

instrumented runway visual rangeRunway visibilitypublished minimum
A METAR may also contain information on precipitation amounts, lightning, and other information that would be of interest to pilots or meteorologists such as a pilot report or PIREP, colour states and runway visual range (RVR).
RVRs are provided in METARs and are transmitted by air traffic controllers to aircraft making approaches to allow pilots to assess whether it is prudent and legal to make an approach.

Overcast

undercastcloud coverclouding over
Overcast, written as "OVC" in the METAR observation, is reported when the cloud cover is observed to equal eight oktas (eighths).

Trend type forecast

TREND
A TTF is a professionally considered forecast for weather over a two-hour period, and is based on an actual weather report, such as a METAR or SPECI and appended to the end of it.

Prevailing visibility

The value obtained is usually reported on a METAR and recorded on the ATIS.

Ceiling (cloud)

cloud ceilingceilingceilings
Ceiling is not specifically reported as part of the METAR (METeorological Aviation Report) used for flight planning by pilots worldwide, but can be deduced from the lowest height with broken (BKN) or overcast (OVC) reported.

Surface weather observation

weather observationsobservationssurface observation
Airport observations can be transmitted worldwide through the use of the METAR observing code.

IWXXM

49, Vol II, such as METAR/SPECI, TAF, SIGMET, AIRMET, Tropical Cyclone Advisory and Volcanic Ash Advisory.

SYNOP

synoptic codeSYNOP (surface synoptic observations)synoptic

Weather

weather conditionsweather systemselements
METAR is a format for reporting weather information.

Aircraft pilot

pilotaviatorpilots
A METAR weather report is predominantly used by aircraft pilots, and by meteorologists, who use aggregated METAR information to assist in weather forecasting.

Meteorology

meteorologicalmeteorologistmeteorologists
A METAR weather report is predominantly used by aircraft pilots, and by meteorologists, who use aggregated METAR information to assist in weather forecasting.

International Civil Aviation Organization

ICAOICAO recommendations on use of the International System of UnitsInternational Civil Aviation Organization (ICAO)
It is highly standardized through the International Civil Aviation Organization (ICAO), which allows it to be understood throughout most of the world.

United States

AmericanU.S.USA
The United States Federal Aviation Administration (FAA) lays down the definition in its publication the Aeronautical Information Manual as aviation routine weather report while the international authority for the code form, the World Meteorological Organization (WMO), holds the definition to be aerodrome routine meteorological report. The National Oceanic and Atmospheric Administration (part of the United States Department of Commerce) and the United Kingdom's Met Office both employ the definition used by the FAA.