Easy Access Rules for ATM/ANS — Provision of Services

ED Decision 2022/004/R

AERODROME WARNINGS — TEMPLATE FOR AERODROME WARNINGS

(a)Aerodrome warnings should be issued in accordance with the template below or in another format where required by operators or aerodrome meteorological offices.

(b)When the above template is used, the sequence number referred to in the template should correspond to the number of aerodrome warnings issued for the aerodrome since 00.01 UTC on the day concerned.

ED Decision 2022/004/R

RANGES AND RESOLUTIONS — AERODROME WARNINGS

(a)The ranges and resolutions for the numerical elements included in aerodrome warnings are shown below:

(b)The explanations for the abbreviations can be found in ICAO Doc 8400 'Procedures for Air Navigation Services — ICAO Abbreviations and Codes (PANS-ABC)'.

ED Decision 2022/004/R

AERODROME WARNINGS — EXAMPLES OF ELEMENTS

Non-exhaustive examples of the different elements used in the formulation of aerodrome warnings are provided below.

ED Decision 2022/004/R

Phenomenon (M) — TOX CHEM

When issuing an aerodrome warning due to information related to toxic chemical affecting an aerodrome and or volcanic ash deposition, the warning should be filed by means of the use of free text up to 32 characters, e.g. TOX CHEM FCST XXXX AIRPORT NEARBY WKN. (XXXX = ICAO Location Indicator)

ED Decision 2020/008/R

AERODROME WARNINGS — FORMAT

(a)The additional text should be prepared in abbreviated plain language using approved ICAO abbreviations and numerical values. If no ICAO-approved abbreviations are available, English plain language text should be used.

(b)When quantitative criteria are necessary for the issuance of aerodrome warnings, the criteria used should be as agreed between the aerodrome meteorological office and the users concerned.

ED Decision 2022/004/R

WIND SHEAR WARNINGS - FORMAT

(a)The use of text in addition to the abbreviations listed in the template in Appendix 4 should be kept to a minimum. The additional text should be prepared in abbreviated plain language using ICAO-approved abbreviations and numerical values.

(b)When an aircraft report is used to prepare a wind shear warning or to confirm a warning previously issued, the corresponding aircraft report, including the aircraft type, should be disseminated unchanged in accordance with the local arrangements to those concerned.

ED Decision 2020/008/R

WIND SHEAR TYPES

Following reported encounters by both arriving and departing aircraft, two different wind shear warnings may exist: one for arriving aircraft and one for departing aircraft.

ED Decision 2020/008/R

REPORTING THE INTENSITY OF WIND SHEAR

Specifications for reporting the intensity of wind shear are still under development. It is recognised, however, that pilots, when reporting wind shear, may use the qualifying terms ‘moderate’, ‘strong’ or ‘severe’, based to a large extent on their subjective assessment of the intensity of the wind shear encountered.

ED Decision 2020/008/R

DETECTION OF WIND SHEAR

Wind shear conditions are normally associated with the following phenomena:

(a)thunderstorms, microbursts, funnel cloud, tornado or waterspout, and gust fronts;

(b)frontal surfaces;

(c)strong surface winds coupled with local topography;

(d)sea breeze fronts;

(e)mountain waves, including low-level rotors in the terminal area;

(f)low-level temperature inversions.

ED Decision 2017/001/R

DISSEMINATION OF WIND SHEAR ALERTS

The wind shear alerts are disseminated from automated, ground-based, wind shear remote-sensing or detection equipment in accordance with local arrangements to those concerned.

Chapter 3 — Technical requirements for meteorological watch offices

Regulation (EU) 2021/1338

(a)SIGMET shall be issued in accordance with the template shown in Appendix 5.

(b)SIGMET shall consist of three types:

(1)SIGMET for en-route weather phenomena other than volcanic ash or tropical cyclones;

(2)SIGMET for volcanic ash;

(3)SIGMET for tropical cyclones.

(c)The sequence number of SIGMET shall consist of three characters comprising one letter and two numbers.

(d)Only one of the phenomena listed in Appendix 5 shall be included in a SIGMET, using the appropriate abbreviations and the following threshold value of surface wind speed of 34 kt or more for tropical cyclones.

(e)SIGMET concerning thunderstorms or a tropical cyclone shall not include references to associated turbulence and icing.

ED Decision 2020/008/R

AIRSPACE

In cases where the airspace is divided into a flight information region (FIR) and an upper-flight information region (UIR), the SIGMET should be identified by the location indicator of the ATS unit serving the FIR.

ED Decision 2022/004/R

SIGMET — CODE FORM

SIGMET, and cancellations thereof, should be encoded using:

(a)the IWXXM GML form as specified in point (a) of AMC1 MET.TR.115(a);

(b)abbreviated plain language as specified in point (c) of AMC1 MET.TR.115(a).

ED Decision 2022/004/R

FORMAT

SIGMET, when issued in graphical format, should be as specified below:

(a)SIGMET FOR TROPICAL CYCLONE — MODEL STC

(b)SIGMET FOR VOLCANIC ASH — MODEL SVA, MERCATOR PROJECTION

(c)SIGMET FOR VOLCANIC ASH — MODEL SVA, POLAR STEREOGRAPHIC PROJECTION

(d)SIGMET FOR PHENOMENA OTHER THAN TROPICAL CYCLONES AND VOLCANIC ASH — MODEL SGE

ED Decision 2022/004/R

COORDINATION WITH NEIGHBOURING METEOROLOGICAL WATCH OFFICES (MWOs)

An MWO should coordinate SIGMET with neighbouring MWO(s), especially when the en-route weather phenomenon extends or is expected to extend beyond the MWO’s specified area of responsibility, to ensure harmonised SIGMET provision.

ED Decision 2020/008/R

FLIGHT INFORMATION REGION

The SIGMET applies to the whole airspace within the lateral limits of the FIR, i.e. to the FIR and to the UIR. The particular areas and/or flight levels affected by the meteorological phenomena causing the issuance of the SIGMET are given in the text of the message.

ED Decision 2020/008/R

EXAMPLE OF SIGMET, AND THE CORRESPONDING CANCELLATIONS

ED Decision 2020/008/R

EXAMPLE OF SIGMET FOR TROPICAL CYCLONE

ED Decision 2020/008/R

EXAMPLE OF SIGMET FOR VOLCANIC ASH

ED Decision 2022/004/R

EXAMPLE OF SIGMET FOR RADIOACTIVE CLOUD

ED Decision 2020/008/R

EXAMPLE OF SIGMET FOR SEVERE TURBULENCE

ED Decision 2022/004/R

COORDINATION WITH NEIGHBOURING METEOROLOGICAL WATCH OFFICES (MWOs)

Guidance on the bilateral or multilateral coordination between MWOs of neighbouring States for the provision of SIGMET can be found in ICAO EUR Doc 014 ‘EUR SIGMET and AIRMET Guide’.

ED Decision 2022/004/R

SEQUENCE NUMBER

(a)The three-character sequence number should be constructed using a single letter identifying the phenomenon, followed by two numeric characters corresponding to the number of SIGMET issued for that phenomenon for the specified flight information region since 00.01 UTC on the day concerned.

(b)The letters to be used as the first character for the SIGMET sequence number to indicate the specified en-route weather and other phenomena for which the SIGMET has been issued should be:

(c)When SIGMET is issued for test purposes (‘TEST’ status indicator used in the SIGMET), then the appropriate letter for exchange test purposes should be used, i.e. ‘Y’ for a TEST volcanic ash SIGMET. When SIGMET is issued for exercise purposes (‘EXER’ status indicator used in the SIGMET), then the letter chosen should correspond to that used under normal circumstances, i.e. ‘A’ for a SIGMET issued during a volcanic ash exercise.

ED Decision 2020/008/R

CRITERIA RELATED TO PHENOMENA

Sandstorm/dust storm should be considered:

(a)heavy whenever the visibility is below 200 m and the sky is obscured; and

(b)moderate whenever the visibility is:

(1)below 200 m and the sky is not obscured; or

(2)between 200 and 600 m.

ED Decision 2022/004/R

CRITERIA RELATED TO PHENOMENA

(a)An area of thunderstorms and cumulonimbus clouds is considered:

(1)obscured (OBSC) if it is obscured by haze or smoke or cannot be readily seen due to darkness;

(2)embedded (EMBD) if it is embedded within cloud layers and cannot be readily recognised;

(3)isolated (ISOL) if it consists of individual features which affect, or are forecast to affect, an area with a maximum spatial coverage less than 50 % of the area concerned (at a fixed time or during the period of validity); and

(4)occasional (OCNL) if it consists of well-separated features which affect, or are forecast to affect, an area with a maximum spatial coverage between 50 and 75 % of the area concerned (at a fixed time or during the period of validity).

(b)An area of thunderstorms is considered frequent (FRQ) if within that area there is little or no separation between adjacent thunderstorms with a maximum spatial coverage greater than 75 % of the area affected, or forecast to be affected, by the phenomenon (at a fixed time or during the period of validity).

(c)Squall line (SQL) indicates a thunderstorm along a line with little or no space between individual clouds.

(d)Hail (GR) is used as a further description of the thunderstorm, as necessary.

(e)Severe and moderate turbulence (TURB) refers only to: low-level turbulence associated with strong surface winds; rotor streaming; or turbulence whether in cloud or not (CAT). Turbulence is not used in connection with convective clouds.

(f)Turbulence is considered:

(1)severe whenever the peak value of the EDR equals or exceeds 0.45; and

(2)moderate whenever the peak value of the EDR is equal to or above 0.20 and below 0.45.

(g)Severe and moderate icing (ICE) refers to icing in other than convective clouds. Freezing rain (FZRA) should refer to severe icing conditions caused by freezing rain.

(h)A mountain wave (MTW) is considered:

(1)severe whenever an accompanying downdraft of 600 ft/min (3.0 m/s) or more and/or severe turbulence is observed or forecast; and

(2)moderate whenever an accompanying downdraft of 350–600 ft/min (1.75–3.0 m/s) and/or moderate turbulence is observed or forecast.

Regulation (EU) 2021/1338

(a)AIRMET shall be issued in accordance with the template shown in Appendix 5.

(b)The sequence number referred to in the template in Appendix 5 shall correspond to the number of AIRMET issued for the flight information region since 00.01 UTC on the day concerned.

(c)Only one of the phenomena in Appendix 5 shall be included in an AIRMET, using the appropriate abbreviations and the following threshold values, when the phenomenon is below flight level 100, or below flight level 150 in mountainous areas, or higher, where necessary:

(1)widespread surface wind speed above 30 kt with relevant direction and units;

(2)widespread areas affected by reduction of visibility to less than 5 000 m, including the weather phenomenon causing the reduction of visibility;

(3)widespread areas of broken or overcast cloud with height of base less than 1 000 ft above ground level’.

(d)AIRMET concerning thunderstorms or cumulonimbus clouds shall not include references to associated turbulence and icing.

ED Decision 2022/004/R

AIRMET — CODE FORM

AIRMET, and cancellations thereof, should be encoded using:

(a)the IWXXM GML form as specified in point (a) of AMC1 MET.TR.115(a);

(b)abbreviated plain language as specified in point (c) of AMC1 MET.TR.115(a).

ED Decision 2020/008/R

EXAMPLE OF AIRMET FOR MODERATE MOUNTAIN WAVE

ED Decision 2020/008/R

EXAMPLE OF AIRMET, AND THE CORRESPONDING CANCELLATIONS

ED Decision 2020/008/R

FIR

The flight information region may be divided in sub-areas.

ED Decision 2020/008/R

CRITERIA RELATED TO PHENOMENA

In reference to the criteria related to phenomena, please refer to GM1 MET.TR.250(d).

ED Decision 2020/008/R

CRITERIA RELATED TO PHENOMENA

In reference to sandstorm/dust storm, please refer to AMC1 MET.TR.250(d).

Regulation (EU) 2021/1338

(a)When chart form is used for area forecasts for low-level flights, the forecast of upper wind and upper-air temperature shall be issued for points separated by no more than 300 NM and for, as a minimum, the following altitudes: 2 000, 5 000 and 10 000 ft (600, 1 500 and 3 000 m) and 15 000 ft (4 500 m) in mountainous areas. The issuance of forecasts of upper wind and upper-air temperature at an altitude of 2 000 ft (600 m) may be subject to local orographic considerations as determined by the competent authority.

(b)When chart form is used for area forecasts for low-level flights, the forecast of SIGWX phenomena shall be issued as low-level SIGWX forecast for flight levels up to 100, or up to flight level 150 in mountainous areas, or higher, where necessary. Low-level SIGWX forecasts shall include:

(1)the following phenomena warranting the issuance of a SIGMET: severe icing, severe turbulence, cumulonimbus clouds and thunderstorms that are obscured, frequent, embedded or occurring at a squall line, sandstorms/dust storms and volcanic eruptions or a release of radioactive materials into the atmosphere, and which are expected to affect low-level flights;

(2)the following elements in area forecasts for low-level flights: surface wind, surface visibility, significant weather phenomena, mountain obscuration, cloud, icing, turbulence, mountain wave and height of zero-degree isotherm.

(c)When the competent authority has determined that the density of traffic operating below flight level 100, or up to flight level 150 in mountainous areas, or higher, where necessary, warrants the issuance of an AIRMET in combination with area forecasts for low-level flights, the area forecasts shall be issued to cover the layer between the ground and flight level 100, or up to flight level 150 in mountainous areas, or higher, where necessary, and shall contain information on en-route weather phenomena hazardous to low-level flights.

ED Decision 2022/004/R

AMENDMENT OF AREA FORECASTS FOR LOW-LEVEL FLIGHTS

(a)In case that an area forecast for low-level flights is not issued in combination with AIRMET, the criteria for amendments to the area forecast for low-level flights should as a minimum include the weather phenomena hazardous to low-level flights, which would otherwise constitute the criteria for the issuance of AIRMET.

(b)When low-level forecast is issued as a SIGWX chart or as a wind and temperature (W+T) chart, it should, as appropriate, include the cloud/visibility information in the form of visibility/cloud base category which should be provided for well-defined sub-areas and/or route segments. For each sub-area and/or route segment, the reference height to which the cloud base information refers should be specified.

(c)The graphical part of a SIGWX chart should depict the weather situation at the beginning of the validity period. Significant changes of initial weather parameters should be depicted together with time intervals determining the duration of expected changes.

Chapter 4 — Technical requirements for volcanic ash advisory centres (VAACs)

Regulation (EU) 2021/1338

The advisory information on volcanic ash shall be issued in accordance with the template shown in Appendix 6. When no abbreviations are available, English plain language text, to be kept to a minimum, shall be used.

ED Decision 2022/004/R

VOLCANIC ASH ADVISORY — CODE FORM

Volcanic ash advisory should be disseminated using:

(a)the IWXXM GML form as specified in point (a) of AMC1 MET.TR.115(a);

(b)abbreviated plain language as specified in point (c) of AMC1 MET.TR.115(a).

ED Decision 2022/004/R

VOLCANIC ASH ADVISORY INFORMATION — GRAPHICAL FORMAT

The volcanic ash advisory information listed in Appendix 6 to Annex V (Part-MET) to Regulation (EU) 2017/373, when prepared in graphical format, should be as specified below and issued using the portable network graphics (PNG) format as specified in point (f) of
AMC1 MET.TR.115(a):

Example of volcanic ash advisory in graphical format from the London VAAC. Mercator projection.

Note: The example above is fictitious.

Example of volcanic ash advisory in graphical format from the Toulouse VAAC. Mercator projection.

Note: The example above is fictitious.

Example of volcanic ash advisory in graphical format from the Wellington VAAC. Polar stereographic projection.

Note: The example above is fictitious.

ED Decision 2022/004/R

EXAMPLES OF ADVISORY FOR VOLCANIC ASH

Chapter 5 — Technical requirements for tropical cyclone advisory centres (TCACs)

Regulation (EU) 2021/1338

The advisory information on tropical cyclones shall be issued in accordance with the template shown in Appendix 7 for tropical cyclones when the maximum of the 10-minute mean surface wind speed is expected to reach or exceed 34 kt during the period covered by the advisory.

ED Decision 2022/004/R

TROPICAL CYCLONE ADVISORY — CODE FORM

Tropical cyclone advisory should be disseminated using:

(a)the IWXXM GML form as specified in point (a) of AMC1 MET.TR.115(a);

(b)abbreviated plain language as specified in point (c) of AMC1 MET.TR.115(a).

ED Decision 2022/004/R

TROPICAL CYCLONE ADVISORY — GRAPHICAL FORMAT

The tropical cyclone advisory information listed in Appendix 7 to Annex V (Part-MET) to Regulation (EU) 2017/373, when prepared in graphical format, should be as specified below and issued using the portable network graphics (PNG) format as specified in point (f) of
AMC1 MET.TR.115(a):

Example of tropical cyclone advisory in graphical format from the La Réunion TCAC.

Note: The example above is based on a real event.

ED Decision 2022/004/R

ADVISORY FOR TROPICAL CYCLONES — EXAMPLE

Chapter 6 — Technical requirements for world area forecast centres (WAFCs)

Regulation (EU) 2021/1338

(a)WAFCs shall use processed meteorological data in the form of grid point values for the supply of gridded global forecasts and forecasts of significant weather phenomena.

(b)For global gridded forecasts, WAFCs shall:

(1)prepare forecasts of:

(i)upper wind;

(ii)upper-air temperature;

(iii)humidity;

(iv)direction, speed and flight level of maximum wind;

(v)flight level and temperature of tropopause;

(vi)areas of cumulonimbus clouds;

(vii)icing;

(viii)turbulence;

(ix)geopotential altitude of flight levels;

four times a day and be valid for fixed valid times at 6, 9, 12, 15, 18, 21, 24, 27, 30, 33 and 36 hours after the time (00.00, 06.00, 12.00 and 18.00 UTC) of the synoptic data on which the forecasts were based;

(2)issue forecasts referred to in point (1) and complete their dissemination as soon as technically feasible, but not later than 5 hours after standard time of observation;

(3)provide grid point forecasts in a regular grid comprising:

(i)wind data for flight levels 50 (850 hPa), 80 (750 hPa), 100 (700 hPa), 140 (600 hPa), 180 (500 hPa), 210 (450 hPa), 240 (400 hPa), 270 (350 hPa), 300 (300 hPa), 320 (275 hPa), 340 (250 hPa), 360 (225 hPa), 390 (200 hPa), 410 (175 hPa), 450 (150 hPa), 480 (125 hPa) and 530 (100 hPa) with a horizontal resolution of 1,25° of latitude and longitude;

(ii)temperature data for flight levels 50 (850 hPa), 80 (750 hPa), 100 (700 hPa), 140 (600 hPa), 180 (500 hPa), 210 (450 hPa), 240 (400 hPa), 270 (350 hPa), 300 (300 hPa), 320 (275 hPa), 340 (250 hPa), 360 (225 hPa), 390 (200 hPa), 410 (175 hPa), 450 (150 hPa), 480 (125 hPa) and 530 (100 hPa) with a horizontal resolution of 1,25° of latitude and longitude;

(iii)humidity data for flight levels 50 (850 hPa), 80 (750 hPa), 100 (700 hPa), 140 (600 hPa) and 180 (500 hPa) with a horizontal resolution of 1,25° of latitude and longitude;

(iv)geopotential altitude data for flight levels 50 (850 hPa), 80 (750 hPa), 100 (700 hPa), 140 (600 hPa), 180 (500 hPa), 210 (450 hPa), 240 (400 hPa), 270 (350 hPa), 300 (300 hPa), 320 (275 hPa), 340 (250 hPa), 360 (225 hPa), 390 (200 hPa), 410 (175 hPa), 450 (150 hPa) 480 (125 hPa) and 530 (100 hPa) with a horizontal resolution of 1,25° of latitude and longitude;

(v)direction, speed and flight level of maximum wind with a horizontal resolution of 1,25° of latitude and longitude;

(vi)flight level and temperature of tropopause with a horizontal resolution of 1,25° of latitude and longitude;

(vii)icing for layers centred at flight levels 60 (800 hPa), 100 (700 hPa), 140 (600 hPa), 180 (500 hPa), 240 (400 hPa) and 300 (300 hPa) with a horizontal resolution of 0,25° of latitude and longitude;

(viii)turbulence for layers centred at flight levels 100 (700 hPa), 140 (600 hPa), 180 (500 hPa), 240 (400 hPa), 270 (350 hPa), 300 (300 hPa), 340 (250 hPa), 390 (200 hPa) and 450 (150 hPa) with a horizontal resolution of 0,25° of latitude and longitude;

(ix)horizontal extent and flight levels of base and top of cumulonimbus clouds with a horizontal resolution of 0,25° of latitude and longitude.

(c)For global forecasts of en-route significant weather phenomena, WAFCs shall:

(1)prepare SIGWX forecasts four times a day and shall be valid for fixed valid times at 24 hours after the time (00.00, 06.00, 12.00 and 18.00 UTC) of the synoptic data on which the forecasts were based. The dissemination of each forecast shall be completed as soon as technically feasible, but not later than 7 hours after standard time of observation under normal operations and not later than 9 hours after standard time of observation during backup operations;

(2)issue SIGWX forecasts as high-level SIGWX forecasts for flight levels between 250 and 630;

(3)include in SIGWX forecasts the following items:

(i)tropical cyclone provided that the maximum of the 10-minute mean surface wind speed is expected to reach or exceed 34 kt;

(ii)severe squall lines;

(iii)moderate or severe turbulence (in cloud or clear air);

(iv)moderate or severe icing;

(v)widespread sandstorm/dust storm;

(vi)cumulonimbus clouds associated with thunderstorms and with points (i) to (v);

(vii)non-convective cloud areas associated with in-cloud moderate or severe turbulence and/or moderate or severe icing;

(viii)flight level of tropopause;

(ix)jet streams;

(x)information on the location of volcanic eruptions that are producing ash clouds of significance to aircraft operations, comprising: volcanic eruption symbol at the location of the volcano and, in a separate text box on the chart, the volcanic eruption symbol, the name of the volcano, if known, and the latitude/longitude of the eruption. In addition, the legend of SIGWX charts should indicate ‘CHECK SIGMET, ADVISORIES FOR TC AND VA, AND ASHTAM AND NOTAM FOR VA’;

(xi)information on the location of a release of radioactive materials into the atmosphere of significance to aircraft operations, comprising: the radioactive materials in the atmosphere symbol at the location of the release and, in a separate box on the chart, the radioactive materials in the atmosphere symbol, latitude/longitude of the site of the release and, if known, the name of the site of the radioactive source. In addition, the legend of SIGWX charts on which a release of radiation is indicated should contain ‘CHECK SIGMET AND NOTAM FOR RDOACT CLD’.

(4)The following criteria shall be applied for SIGWX forecasts:

(i)points (i) to (vi) of point (3) shall only be included if expected to occur between the lower and upper levels of the SIGWX forecast;

(ii)the abbreviation ‘CB’ shall only be included when it refers to the occurrence or expected occurrence of cumulonimbus clouds:

(A)affecting an area with a maximum spatial coverage of 50 % or more of the area concerned;

(B)along a line with little or no space between individual clouds; or

(C)embedded in cloud layers or concealed by haze;

(iii)the inclusion of ‘CB’ shall be understood to include all weather phenomena normally associated with cumulonimbus clouds, i.e. thunderstorm, moderate or severe icing, moderate or severe turbulence, and hail;

(iv)where a volcanic eruption or a release of radioactive materials into the atmosphere warrants the inclusion of the volcanic activity symbol or the radioactivity symbol in SIGWX forecasts, the symbols shall be included on SIGWX forecasts irrespective of the height to which the ash column or radioactive material is reported or expected to reach;

(v)in the case of coincident or the partial overlapping of points (i), (x) and (xi) of point (3), the highest priority shall be given to point (x), followed by points (xi) and (i). The point with the highest priority shall be placed at the location of the event, and an arrow shall be used to link the location of the other point(s) to its (their) associated symbol(s) or text box(es).

(d)Medium-level SIGWX forecasts for flight levels between 100 and 450 for limited geographical areas shall be issued.

ED Decision 2017/001/R

GRIDDED GLOBAL FORECASTS

The telecommunications facilities used for the supply of world area forecast system products should:

(a)be the aeronautical fixed service or the public Internet;

(b)be continuous; and

(c)not have interruptions exceeding 10 minutes during any period of 6 hours.

ED Decision 2022/004/R

WORLD AREA FORECAST CENTRE GLOBAL GRIDDED FORECASTS — CODE FORM

World area forecast centre global gridded forecasts should be encoded using the GRIB code form as specified in point (d) of AMC1 MET.TR.115(a).

ED Decision 2022/004/R

GRID POINT FORECASTS

(a)Layers centred at a flight level referred to in MET.TR.275(b)(3)(vii) have a depth of 100 hPa.

(b)Layers centred at a flight level referred to in MET.TR.275(b)(3)(viii) have a depth of 100 hPa for flight levels below 240, then 50 hPa for flight levels 240 and above.

ED Decision 2022/004/R

GRID POINT FORECASTS

The turbulence referred to in MET.TR.275(b)(3)(viii) encompasses all types of turbulence, including clear-air turbulence and in-cloud turbulence.

ED Decision 2022/004/R

GRID POINT FORECASTS

The exact pressure levels (hPa) for MET.TR.275(b)(3) (i), (ii), (iii), (iv), (vii), and (viii) are provided in ICAO Doc 8896 ‘Manual of Aeronautical Meteorological Practice’.

ED Decision 2022/004/R

WORLD AREA FORECAST CENTRE (WAFC) GLOBAL FORECASTS OF SIGNIFICANT WEATHER — CODE FORM

World area forecast centre (WAFC) global forecasts of significant weather should be disseminated using:

(a)the IWXXM GML form as specified in point (a) of AMC1 MET.TR.115(a);

(b)the BUFR code form as specified in point (e) of AMC1 MET.TR.115(a).

ED Decision 2022/004/R

MEDIUM-LEVEL SIGWX FORECASTS

The medium-level SIGWX forecasts provided for flight levels between 100 and 450 for limited geographical areas should cover the areas as shown in Appendix 2.

APPENDICES TO ANNEX V

Regulation (EU) 2021/1338