METAR: Difference between revisions

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[[Image:weather_scenario.jpg|thumb|250px]]
#REDIRECT(Weather#METAR)
A [[METAR]] is a codified observation message indicating an airfield weather conditions observed at a given time. There are different ways of messaging weather reports, but in [[FlightGear]] is [[METAR]] used.
 
The [[METAR]]-message can be found acros the menu (Weather > Weather Scenario). To have the actual weather (or playing with [[ATC]]) you need to enable the Real weather fetch in the [[FlightGear Wizard]].
 
Such a message is established every hour.
 
==Explanation==
'''Example:'''
{| class="prettytable"; border="1" style="border-collapse:collapse; border:1px solid silver;"
|2008/03/15 12:24
|KSFO
|151224Z
|05012KT
|10SM
|SN
|BKN050
|02/M08
|A3016
|RMK AO2 SLP228
|T00221083
|-
|1
|2
|3
|4
|5
|6
|7
|8
|9
|10
|11
|}
 
# Date
# [[ICAO]] Identifier (4-letter)
# Issuance Time DDHHMMz (UTC)
#*COR (CCD in Canada) if correction to observation
#Wind
#*First 3 digits: True Wind direction or average if variable (VRB).
#**Note: If the wind direction varies 60° or more, the direction will be indicated with a V (e.g. 180V250)
#*Next 2 digits: Mean speed and units
#** KT=knots, KMH=kilometers/hour, MPS=meters/second
#*G (gust) as needed – 2 or 3 digit maximum speed
#*Calm will be indicated by 00000KT
#*Example: 18012G22KT 150V240
#Horizontal Visibility
#*Prevailing Visibility (PV)
#**Statue miles (SM) and fractions (US & Canada only) or,
#**4 digit minimum visibility in meters, and,
#**Lowest value and direction, as required (shown as a remark)
#*Runway Visual Range (RVR)
#**R: Runway Designator, L/R/C as needed, “/”
#**P/M: Plus/Minus (US only)
#**4 digit value (feet/meters)
#**V (variability) with tendency U/D/N (up/down/no change)
#**Example: R18R/1200FTV/U
#Present Weather (Constructed sequentially):
#*Intensity
#*Descriptor
#*Precipitation (Dominant type is listed first if more than one type reported)
#*Obscuration
#*Other
#Sky Cover
#*Cloud Description
#**Amount in eights (octas)
#**SKC=Sky Clear (clear below 12,000 for ASOS/AWOS)
#**NSC=No significant clouds
#**FEW=Few (1/8 to 2/8 sky cover)
#**SCT=Scattered (3/8 to 4/8 sky cover)
#**BKN=Broken (5/8 to 7/8 sky cover)
#**OVC=Overcast (8/8 sky cover)
#Terperature/Dewpoint (whole °C) (preceded by M=minus)
#*First 2 digits = temperature
#*Second 2 digits = dewpoint
#Altimeter setting (QNH) and indicator (A=InHg, Q=hPa)
#Supplementary Information
#*RE = Recent weather followed by weather codes
#*WS = Windshear, followed by:
#**TKOF/LDG (takeoff/landing)
#**RWY (2 digits runway identifier and designator L/R/C)
#*RMK = Remark
#**SLP = Sea Level Pressure
#**T00221083 (Expanded temp/dewpoint)
#**1st, 5th digits: 0=plus, 1=minus
#**2nd-4th digits: temp (decimal missing) (02.2)
#**6th-8th digits: dewpoint (decimal missing) (-8.3)
#Trend Forecast (2 hours from time of observation) (Not used in US)
#*PROB and 2 digits (30 or 40) = probability 30% or 40%
#*Used to indicate the probability of occurance of alternate element(s) or temporary fluctuations
#*Change Indicator
#**BECMG = Becoming (used where changes are expected to reach or pass through specified values
#**TEMPO = Temporary (fluctuations of less than one hour duration
#**NOSIG = No significant change
#*Forecast Wind (same as item 4)
#*Forecast Visibility (as item 5) (9999 indicates 10Kilometers vis or greater)
#*Forecast Weather (as item 6)
#*Forecast Cloud (as item 7)


[[Category:Aviation]]
[[Category:Aviation]]

Revision as of 19:17, 25 March 2009

  1. REDIRECT(Weather#METAR)
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