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Remark: A review of information on sea-surface temperature and the state of the sea will be
carried out with the operators concerned. If required, this could be introduced in 2007.
The abbreviation "NDV" will be introduced in automated METAR reports from 6 October 2005.
The abbreviation "UP" will be introduced in automated METAR reports from 6 October 2005.
The reporting of missing cloud types using "I//" and the abbreviation "NCD" will be introduced in
automated METAR reports from 6 October 2005.
The abbreviation "REUP" will be introduced in automated METAR reports from 6 October 2005.
The use of the term "METAR COR" to indicate the type of report will be introduced from
6 October 2005.
Additional visibility thresholds of 5 000 m (irrespective of numbers of VFR flights) and 10 km are
used. Visibility thresholds of 150,600 and 3 000 m are not used. However, visibility thresholds of
3 000 m and 7 km are used additionally for eleven civil aerodromes serving off-shore helicopter
operations.
Remark: Thresholds agreed in consultation with operators to provide relevant information and
limit TAF length.
* Recommended Practice
4 UNITEDKI NGDOM SUPPLEMENT TO ANNEX 3 (FIFTEENTH EDITION)
e) Additional cloud base thresholds of 1 500 ft and 5 000 ft for cloud layers of BKN or OVC extent
are used. An additional threshold of 700 ft is used for ten civil aerodromes serving off-shore
helicopter operations.
Remark: Criteria exceed ICAO SARPs.
h) Forecasts of vertical visibility are not issued.
Remark: There is no operational requirement for observations of vertical visibility.
Visibility threshold of 5 000 m is used irrespective of numbers of VFR flights.
Remark: Criteria exceed ICAO SARPs.
The cloud base threshold of 1 500 ft will be used irrespective of numbers of VFR flights, for cloud
layers of BKN or OVC extent. An additional cloud base threshold of 300 ft will be used. An
additional threshold of 700 ft will be used for eleven civil aerodromes serving offshore helicopter
operations.
Remark: Criteria exceed ICAO SARPs.
Forecasts of vertical visibility are not made in the United Kingdom.
Remark: There is no operational requirement for observations of vertical visibility.
* Recommended Practice
15/6/05
CHAPTER 2
2.1.5 The United States has its own standards on the qualifications and training of meteorological
personnel providing service for international air navigation.
Remark: Training requirements are provided for national weather service (NWS) meteorologists.
There are no provisions to notify the meteorological office of flight schedules, delays, or
cancellation of flights.
CHAPTER 3
3.4.2 g) MWOs have no provision to supply information received concerning the accidental release of
radioactive material into the atmosphere to associated ACCFIC.
MWOs do not supply information on location, date, time and forecast trajectories of radioactive
material released into the atmosphere.
CHAPTER 4
CHAPTER 5
Local routine and special reports are not issued.
The field d) is also used to denote a correction to the METARISPECI by "COR.
Visibility is reported in statute miles.
RVR values in the METARfSPECI are reported in feet (ft).
The following weather elements are augmented manually at designated automated station
observation sites: FC, TS, GR, GS and VA. At selected airports, additional present weather
elements may be provided. With the exception of volcanic ash, present weather is reported when
prevailing visibility is less than 7 statute miles or considered operationally significant. Volcanic
ash is always reported when observed.
Practice is to use AUTO in the METAR/SPECI during operational hours of the aerodrome.
Urgent pilot reports are used in lieu of special aircraft observations. They include hail (GR, GS),
low-level wind shear (within 2 000 ft of surface), severe icing, severe extreme turbulence, tornado,
funnel cloud or water spout (FC) and volcanic eruption andor volcanic ash. In addition, routine
pilot reports and urgent pilot reports identify the location of the weather phenomenon by
NAVAIDs.
* Recommended Practice
CHAPTER 6
CHAPTER 7
Landing and take-off forecasts are provided by the TAF. Select military aerodromes provide
temperature and lowest altimeter setting.
AIRMETs are issued on a scheduled basis every 6 hours.
APPENDIX 3
2.2 The United States does not use the term CAVOK in meteorological reports.
2.3.2* a) Practices require SPEC1 for wind shift when wind direction changes by 45" or more in less than 15
minutes and the wind speed is 10 kt or more throughout the wind shift.
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