GEN 3.5  METEOROLOGICAL SERVICES

1  RESPONSIBLE SERVICE

1.1  Aeronautical meteorological authority is Civil Aviation Authority of Viet Nam
Post:

Air Navigation Department
Civil Aviation Authority Of Viet Nam (CAAV)
119 Nguyen Son Street, Long Bien District
Ha Noi 10 000, Viet Nam

Telephone:   +84 24 38720199 or +84 24 38271513 ext 8242

Fax:   +84 24 38274194

AFS:  NIL

Email:   and@caa.gov.vn

URL:   http://caa.gov.vn

1.2  Aeronautical meteorological service provider in Viet Nam is Vietnam Air traffic Management Corporation
Post:

Vietnam Air Traffic Management Corporation
5/200 Nguyen Son Street, Long Bien District
Ha Noi 10 000, Viet Nam

Telephone:  +84 24 38 721 698 ext 8258

Fax:  +84 24 730 060

AFS:  VVVVYMYX

Email:   mwovietnam@vatm.vn

URL:   http://www.mwovatm.vn

1.3  The service is provided in accordance with the provisions contained in the following ICAO Documents:

  1. Annex 3 – Meteorological Service for International Air Navigation.

  2. Doc 7030 – Regional Supplementary Procedures, Middle East/Asia (MID/ASIA) chapter 12 - Meteorology.

  3. Doc 8896 – Manual of Aeronautical Meteorological Practice.

  4. Doc 9328 – Manual of RVR Observing and Reporting Practices.

  5. Doc 9365 – Manual of All-Weather Operations.

  6. Doc 9377 – Manual on Coordination between Air Traffic Service, Aeronautical Information Services and Aeronautical Meteorological Services.

  7. Doc 9691 – Manual on Volcanic Ash, Radioactive Material and Toxic Chemical Clouds.

  8. Doc 9817 – Manual on Low-level wind shear.

  9. Doc 9837 – Manual on Automatic Meteorological Observing Systems at Aerodromes.

  10. Doc 9873 – Guide to the Quality Management System for the Provision of Meteorological Service for International Air Navigation.

  11. ROBEX Handbook.

  12. Asia/Pacific Regional SIGMET Guide.

Differences to these provisions are detailed in subsection GEN 1.7.

Differences to these provisions are detailed in subsection GEN 1.7.

  1. Annex 3 – Meteorological Service for International Air Navigation.

  2. Doc 7030 – Regional Supplementary Procedures, Middle East/Asia (MID/ASIA) chapter 12 - Meteorology.

  3. Doc 8896 – Manual of Aeronautical Meteorological Practice.

  4. Doc 9328 – Manual of RVR Observing and Reporting Practices.

  5. Doc 9365 – Manual of All-Weather Operations.

  6. Doc 9377 – Manual on Coordination between Air Traffic Service, Aeronautical Information Services and Aeronautical Meteorological Services.

  7. Doc 9691 – Manual on Volcanic Ash, Radioactive Material and Toxic Chemical Clouds.

  8. Doc 9817 – Manual on Low-level wind shear.

  9. Doc 9837 – Manual on Automatic Meteorological Observing Systems at Aerodromes.

  10. Doc 9873 – Guide to the Quality Management System for the Provision of Meteorological Service for International Air Navigation.

  11. ROBEX Handbook.

  12. Asia/Pacific Regional SIGMET Guide.

The service is provided in accordance with the provisions contained in the following ICAO Documents:

Post:

Air Navigation Department
Civil Aviation Authority Of Viet Nam (CAAV)
119 Nguyen Son Street, Long Bien District
Ha Noi 10 000, Viet Nam

Telephone:   +84 24 38720199 or +84 24 38271513 ext 8242

Fax:   +84 24 38274194

AFS:  NIL

Email:   and@caa.gov.vn

URL:   http://caa.gov.vn

The meteorological services for civil aviation are provided by Air Navigation Department - Civil Aviation Authority of Viet Nam (CAAV).

2  AREA OF RESPONSIBILITY

Meteorological Service is provided for civil aerodromes in Viet Nam and within Ha Noi and Ho Chi Minh FIRs.

3  MET OBSERVATIONS AND REPORTS

Table GEN 3.5.3 Meteorological observations and reports

Name of station/ Location Indicator

Type & frequency of observation/ automatic observing equipment

Types of MET reports & availability trend forecasts

Observation system & site(s)

Hours of operation

Climatological Information

1

2

3

4

5

6

   

 

 

 

DAK LAK/

Buon Ma Thuot

VVBM

  

Manual equipment:

  1. Anemometers

  2. 2 Temperature and Humidity sensor

  3. Pressure sensor

H24

 
   

 

 H24  

QUANG NAM/

Chu Lai

VVCA

  

  1. Automatic Weather Observing System IMS:

    1. 2 Sensors measure the surface wind speed, 2 present weather visibility sensor, 1 Humidity sensor, 1 Pressure sensor, 1 Rain gauge, 1 Thunderstorm lightning detector, 2 Cloud height site ceilometer, 1 background luminance sensor, 1 Temperature sensor, 2 datalogger.

  2. Manual equipment

  3. Automatic Weather Observing System AW11

Automatic Weather Observing System IMS:

  1. RWY 14: 1 Sensor measure the surface wind speed, 1 present weather visibility sensor, 1 background luminance sensor.

  2. RWY 32: 1 Sensors measure the surface wind speed, 1 present weather visibility sensor, 1 background luminance sensor, 1 Temperature sensor, 1 Humidity sensor, 1 Pressure sensor, 1 Rain gauge, 1 Thunderstorm lightning detector, 2 Cloud height site ceilometer, 2 datalogger.

 H24  
  

 

 

 

 
 

 

 

 

 

 

HAI PHONG/Cat Bi

VVCI

Half an hour

METAR, TREND

  1. Automatic Weather Observing System AVIMET:

    1. 3 Ultrasonic wind sensor,

    2. 2 Visibility sensors,

    3. 1 Visibility and present weather sensor,

    4. 2 Background luminance,

    5. 1 Sensor connect with the intensity of ambient light on the runway,

    6. 2 Cloud height site ceilometer,

    7. 1 Temperature and humidity sensor,

    8. 1 Atmospheric pressure sensor,

    9. 1 Precipitation sensor without pedestal

    10. 1 Lightning detector,

  2. Automatic Weather Observing System AW11:

    1. 1 Sensors measure the surface wind Speed,

    2. 1 Temperature sensors,

    3. 1 Pressure sensor.

H24

Climatological summaries AVBL

 

When there is one or more meteorological elements reaches or exceeds prescribed criteria

SPECI

 

H24

 
   

 

 

 

CA MAU/

Ca Mau

VVCM

  

Manual equipment:

  1. Anemometers,

  2. 2 Temperature and Humidity sensor,

  3. Pressure sensor.

H24

 
  

 

 

 

 
 

 

 

 

 

 

KHANH HOA/Cam Ranh

VVCR

Half an hour

METAR, TREND

Automatic Weather Observing System OPTIMET:

  1. RWY 20R: 1 Sensors measure the surface wind speed, 1 RVR sensor.

  2. Middle: 1 Sensors measure the surface wind speed, 1 Temperature and humidity sensor, 1 Pressure sensor, 1 Rain gauge, 1 Present weather, 1 Thunderstorm lightning detector.

  3. RWY 02L: 1 Sensors measure the surface wind speed, 1 RVR sensor, 1 background luminance sensor.

  4. 1 Cloud height site ceilometer sensors the position 672 M from RWY 02L.

  5. 1 Cloud height site ceilometer sensors the position 372 M from RWY 20R.

  1. 3 Sensors measure the surface wind speed,

  2. 2 RVR sensors for RWY 02 and 20,

  3. 1 RVR sensor in the middle of RWY,

  4. 2 Cloud height site ceilometer,

  5. 1 Sensor messuring T, Td,

  6. 2 Pressure sensors,

  7. 1 Rain gauge,

  8. 1 Lightning detector.

H24

Climatological summaries AVBL

 

When there is one or more meteorological elements reaches or exceeds prescribed criteria

SPECI

 

H24

 
   

 

 

 

BA RIA-VUNG TAU/

Con Dao

VVCS

  

Manual equipment:

  1. Anemometers

  2. 2 Temperature and Humidity sensor

  3. Pressure sensor

H24

 
  

 

 

 

 
  

 

 

 

 

CAN THO/

Can Tho

VVCT

Half an hour

METAR, TREND

  1. Automatic Weather Observing System SUTRON:

    1. 300 M from THR of RWY 24, 150 M from RWY CL: Wind, Visibility/RVR, Cloud height site ceilometor sensor, Backgroundluminance sensor ALS.

    2. 1 500 M from middle of RWY and 150 M from RWY CL: Wind, temperature, humidity, atmospheric pressure, weather phenomena, rain gauge (currently under repair), thunderstorm.

    3. 400 M from THR of RWY 06, 150 M from RWY CL: Wind, visibility/RVR, Cloud height site ceilometor sensor, Background luminance sensor ALS.

  2. Automatic Weather Observing System MILOS 200:

    1. Anemometers, temperature humidity, 1 Sensor measures the atmospheric, computer collects and process weather data, 1 Sensor wind display

  3. Manual equipment

H24

Climatological summaries AVBL

 

When there is one or more meteorological elements reaches or exceeds prescribed criteria

SPECI

 

H24

 
   

 

H24 

QUẢNG BÌNH/

Dong Hoi

VVDH

  

Manual equipment

H24 
   

 

 

 

LAM DONG/

Lien Khuong

VVDL

  

Manual equipment:

  1. Wind observer.

  2. Temperature and Humidity sensor.

H24

 
  

 

 

 

 
 

 

 

 

 

 

DA NANG/

Da Nang

VVDN

Half an hour

METAR, TREND

  1. Automatic Weather Observing System OPTIMET:

    1. RWY 35: 1 Sensor measure the surface wind speed, 1 RVR sensor.

    2. Middle: 1 Sensor measure the surface wind speed, 1 Temperature and humidity sensor, 1 Pressure sensor, 1 Rain gauge, 1 Thunderstorm lightning detector, 1 RVR sensor, 1 Present weather, 1 background luminance sensor.

    3. RWY 17: 1 Sensor measure the surface wind speed, 1 RVR sensor.

    4. 1 Cloud height site ceilometer sensor the position 1 336 M from RWY 35.

    5. 1 Cloud height site ceilometer sensor the position 430 M from RWY 17.

    1. 3 Sensors measure the surface wind speed,

    2. 2 RVR sensors for RWY 35R and 17L,

    3. 1 RVR sensor,

    4. 2 Cloud height site ceilometer at RWY 35R and 17L,

    5. 1 Temperature and Humidity sensor,

    6. 1 Pressure sensor,

    7. 1 Rain gauge,

    8. 1 Thunderstorm lightning detector,

    9. 1 Present weather.

  2. Automatic Weather Observing System MIDAS 600:

  3. 1 Hand-held weather meter KESTREL

  4. Manual equipment

  5. Doppler WX radar system (METOR 60DX10-S) intergrated with low-level WS alert system (LLWAS)

H24

Climatological summaries AVBL

 

When there is one or more meteorological elements reaches or exceeds prescribed criteria

SPECI

 

H24

 
 

 

 

 

 

 
 

 

 

 

 

 

Noi Bai

HA NOI/

VVNB

Half an hour

METAR, TREND

  1. Automatic Weather Observing System AVIMET:

    1. 4 Ultrasonic wind sensors,

    2. 1 Temperature and Humidity sensor,

    3. 1 Pressure sensor,

    4. 1 Precipitation sensor,

    5. 2 Cloud height site ceilometers,

    6. 3 Visibility sensors,

    7. 1 present weather sensor,

    8. 3 Background luminance sensors,

    9. 1 Thunderstorm lightning Detector.

  2. Automatic Weather Observing System MIDAS IV:

    1. 3 Wind sensors (wind vane and wind anemometer),

    2. 1 Temperature and Humidity sensor,

    3. 1 Pressure sensor,

    4. 1 Precipitation sensor,

    5. 2 Cloud height ceilometers,

    6. 3 Visibility sensors,

    7. 1 Present weather.

  3. Manual equipment

  4. UHF Doppler Wind Profiler

  5. WAFS/SADIS-2G System

  6. Doppler WX radar system METOR 60DX10-S intergrated with low-level WS alert system LIDAR

H24

 

Climatological summaries AVBL

 

When there is one or more meteorological elements reaches or exceeds prescribed criteria

SPECI

 

H24

 
  

 

  H24  
 

 

 

 H24 

HUE/

Phu Bai

VVPB

Half an hour

METAR, TREND

  1. Automatic Weather Observing System AWOS-900:

    1. RWY 09: Cloud height site ceilometer, visibility, wind sensors.

    2. In the middle: Present weather, temperature and humidity, atmospheric pressure, rain gauge sensors.

    3. RWY 27: Visibility sensor, intensity of ambient light, wind, cloud height site ceilometer sensors.

  2. KESTREL: Handheld weather meter.

  3. Manual equipment

H24

Climatological summaries AVBL

 

When there is one or more meteorological elements reaches or exceeds prescribed criteria

SPECI

 

H24

 
   

 

 

 

BINH DINH/

Phu Cat

VVPC

  

Automatic Weather Observing System IMS:

  1. RWY 15: 1 Sensors measure the surface wind speed, 1 RVR sensor, 1 background luminance sensor.

  2. RWY 33: 1 Sensors measure the surface wind speed, 1 RVR sensor, 1 background luminance sensor, 1 Temperature sensor, 1 Humidity sensor, 1 Pressure sensor, 1 Rain gauge, 1 Thunderstorm lightning detector, 2 Cloud height site ceilometer, 2 datalogger .

H24

 
   

 

 

 

GIA LAI/

Pleiku

VVPK

  

  1. Automatic Weather Observing System IMS:

    1. RWY 09: 1 Sensor measure the surface wind speed, 1 RVR sensor, 1 background luminance sensor.

    2. Middle: 1 Sensor measure the surface wind speed, 1 Present weather, temperature and humidity, 1 Temperature sensor, 1 Humidity sensor, 1 Pressure sensor, 1 Rain gauge, 1 Thunderstorm lightning detector.

    3. RWY 27: 1 Sensor measure the surface wind speed, 1 RVR sensor, 1 background luminance sensor, 2 cloud height site ceilometer sensors, datalogger.

  2. Manual equipment

Automatic Weather Observing System IMS:

  1. RWY 09: 1 Sensors measure the surface wind speed, 1 RVR sensor, 1 background luminance sensor.

  2. Middle: 1 Sensors measure the surface wind speed, 1 Present weather, temperature and humidity, 1 Temperature sensor, 1 Humidity sensor, 1 Pressure sensor, 1 Rain gauge, 1 Thunderstorm lightning detector.

  3. RWY 27: 1 Sensors measure the surface wind speed, 1 RVR sensor, 1 background luminance sensor, 2 cloud height site ceilometer sensors, datalogger.

H24

 
  

 

 

 

 
 

 

 

 

 

 

KIEN GIANG/

Phu Quoc

VVPQ

Half an hour

METAR, TREND

  1. Automatic Weather Observing System SUTRON:

    1. 360 M from THR of RWY 10, 120 M from RWY CL: Wind, visibility/RVR, cloud height site ceilometer sensors.

    2. 1 500 M from Middle of 2 THRs of RWY, 120 M from RWY CL: Wind, visibility/RVR, backgroundluminance, temperature and humidity, pressure, present weather, rain gauge, thunderstorm lightning detector sensor.

    3. 360 M from THR of RWY 28, 120 M from RWY CL: Wind, visibility/RVR, backgroundluminance sensors ALS, temperature and humidity, pressure, present weather, rain gauge, thunderstorm lightning detector sensors.

  2. Manual equipment

H24

Climatological summaries AVBL

 

When there is one or more meteorological elements reaches or exceeds prescribed criteria

SPECI

 

H24

 
   

 

 

 

KIEN GIANG/

Rach Gia

VVRG

  

Manual equipment:

  1. Anemometers

  2. 2 Temperature and Humidity sensor

  3. Pressure sensor

H24

 
   

 

 H24  

PHU YEN/

Tuy Hoa

VVTH

  

  1. Automatic Weather Observing System VAISALA (AW11):

    1. 2 Sensors measure the surface wind speed

    2. 1 Temperature and Humidity sensor

  2. Manual equipment

  1. 2 Sensors measure the surface wind speed

  2. 1 Temperature and Humidity sensor

Automatic Weather Observing System VAISALA (AW11):

H24  
 

 

 

 

 

 
 

 

 

 

 

 

HO CHI MINH/

Tan Son Nhat

VVTS

Half an hour

METAR, TREND

  1. Automatic Weather Observing System SUTRON:

    1. 4 Surface wind speed sensors.

    2. 3 Visibility sensors.

    3. 1 Visibility and weather phenomena sensor.

    4. 3 Background luminance.

    5. 2 Sensors connect with the intensity of ambient light on the runway.

    6. 1 Cloud height site ceilometers sensor (currently under repair).

    7. 1 Temperature and Humidity sensor.

    8. 1 Pressure sensor.

    9. 1 Rainfall sensor.

  2. Automatic Weather Observing System ASOS II:

    1. 3 Surface wind speed sensors (mid station sensor is malfunctioning),

    2. 2 MOR và RVR sensor,

    3. 1 Background luminance,

    4. 1 T, Td sensor,

    5. 1 Thunderstorm lightning detector sensor (currently under repair),

    6. 1 DCP,

    7. 1 Rainfall sensor.

  3. Ground Based Weather radar DWSR-93C.

  4. HIMAWARI system.

  5. World area forecast system.

  6. Manual equipment

H24

Climatological summaries AVBL

 

When there is one or more meteorological elements reaches or exceeds prescribed criteria

SPECI

 

H24

 
   

 

H24 

THANH HOA/

Tho Xuan

VVTX

  

Manual equipment

H24 
  

 

 

 

 
 

 

 

 

 

 

QUANG NINH/

Van Don

VVVD

Half an hour

METAR, TREND

  1. AWOS IMS CAT II:

    1. 3 ultrasonic wind sensors at RWY 03, the middle, and RWY 21.

    2. 3 runway visual range sensors at RWY 03, the middle, and RWY 21.

    3. 1 Sensor connect with the intensity of ambient light on the runway at the middle.

    4. 2 Background luminance.

    5. 1 weather phenomena sensors at the middle.

    6. 2 cloud height site ceilometers at RWY 03 and 21.

    7. 1 upper-air temperature sensors at the middle.

    8. 1 air humidity sensors at the middle.

    9. 1 atmospheric pressure sensor at the middle.

    10. 1 thunderstorm lightning detection sensor at the middle.

    11. 1 Rainfall sensor at the middle.

    12. 3 datalogger at RWY 03, the middle, and RWY 21.

  2. Manual equipment

H24

Climatological summaries AVBL

 

When there is one or more meteorological elements reaches or exceeds prescribed criteria

SPECI, TREND

 

H24

 
   

 

H24 

NGHE AN/

Vinh

VVVH

  

Manual equipment

H24

 

4  TYPES OF SERVICE

4.1 Aeronautical Meteorological Service shall contain the following information:

  1. Aerodrome observations and reports.

  2. Forecasts and warnings at aerodrome in the Ha Noi and Ho Chi Minh FIRs;

  3. Briefing, consultation and flight documentation.

  4. ATIS, D-ATIS, VOLMET, D-VOLMET Information.

  5. Operating, exchanging aeronautical meteorological data.

  6. Collecting, storing, analysing, distributing of aeronautical meteorological data.

4.2 Meteorological forecasts and warnings shall contain the following information:

  1. Aerodrome forecasts (TAF, TAF AMD).

  2. Landing forecasts TREND.

  3. Forecasts for take-off.

  4. Upper-air forecasts (upper wind and upper-air temperature; SIGWX phenomena…).

  5. SIGMET.

  6. Aerodrome warnings (AD WRNG).

  7. Wind shear warnings (WS WRNG).

4.3 Preparation and update of flight documentation:
4.3.1 Flight documentation:

  1. Information of flight;

  2. Upper wind and upper-air temperature, SIGWX phenomena.

  3. METAR, SPECI, TAF, TAF AMD, TREND, forecast for take-off.

  4. SIGMET, volcanic ash and tropical cyclone advisory information relevant to the whole route.

4.3.2 Provision of flight documentation:

  1. For international flights: Flight documentation shall be made available for pilot or flight dispatchers of airlines 03 hours before the expected time of departure;

  2. For domestic flights: Flight documentation shall be made available for pilot 01 hours before the expected time of departure;

  3. The related MET office is informed 12 hours before the expected time of departure in case pilot or flight dispatchers of airlines need meteorological information for one or more specific flights earlier than above mentioned time.

4.4 The Meteorological Watch Service and SIGMET information over the Ha Noi and Ho Chi Minh FIRs will be supplied to aircraft in flight through Ha Noi and Ho Chi Minh ATS radio channel and data link.

5  NOTIFICATION REQUIRED FROM OPERATORS

5.1 The meteorological office shall be notified by the operator when:

  1. New routes or new types of operations are planned;

  2. Changes of a lasting character are to be made in scheduled operations; and

  3. Other changes, affecting the provision of meteorological service, are planned.

Such information shall contain all details necessary for the planning of appropriate arrangements by the meteorological authority.

5.2 The operator or a flight crew member shall ensure that, where required by the meteorological authority in consultation with users, the aerodrome meteorological office concerned is notified:

  1. Flight schedules;

  2. When non-scheduled flights are to be operated; and

  3. When flights are delayed, advanced or cancelled.

6  AIRCRAFT REPORT

6.1 Aircraft operating within Viet Nam airspace shall make and report of routine and special aircraft observations (AIREP).
6.2 In case volcanic activity or volcanic ash cloud is observed, pilot shall report to ATS units concerned.

7  VOLMET SERVICE

According to Air Navigation Plan – Asia and Pacific region (Doc 9673 – Table ATS 2-2-2-3 - ICAO):

  1. TAF for Ho Chi Minh FIR is broadcast by KOLKATA transmitting station;

  2. METAR with TREND for Ho Chi Minh and Ha Noi FIRs are broadcast by Bangkok transmitting station on the following frequencies: 11 387KHz, 6 676KHz and 2 965KHz.

8  SIGMET SERVICE

8.1 

For the safety of air traffic, Meteorological Watch Office maintains an area meteorological watch warning service. This service consists of a continuous weather watch within Ha Noi and Ho Chi Minh FIRs and the issuance of appropriate information (SIGMET), both performed by Meteorological Watch Office (MWO) – Aeronautical Meteorological Centre – Viet Nam Air Traffic Management Corporation;

The establishment and provision of en-route and fight area forecast messages based on the data received from World Area Forecast Centre (WAFC) is provided by MET offices at International airports.

Name of MWO/ Location Indicator

Hours

FIR or CTA served

Type of SIGMET/Validity

Specific SIGMETProcedures

AIRMET Procedures

ATS Unit Served

Additional Information

12345678

Meteorological Watch Office VVVVYMYX

H24

Ha Noi and Ho Chi Minh FIRs

  1. WS SIGMET for the dangerous weather other than volcanic ash clouds or tropical cyclones/up to 4h.

  2. WC, WV SIGMET for tropical cyclones and volcanic ash clouds/up to 6h.

NIL

NIL

Ha Noi and Ho Chi Minh ACCs

Nil

The MWO issues SIGMET messages about the occurrence or expected occurrence of one of the following significant meteorological phenomena:

  1. Thunderstorms;

  2. Tropical cyclone;

  3. Severe turbulence;

  4. Severe icing;

  5. Severe mountain waves;

  6. Heavy sandstorm/dustorm;

  7. Volcanic ash cloud;

  8. Radioactive cloud/RDOACT CLD.

The SIGMETs are issued in plain language using ICAO abbreviations and are numbered consecutively for each day and for Ha Noi and Ho Chi Minh FIRs commencing at 0001 (UTC). Their period of validity is limited to not more than 4 hours from the time of transmission of WS SIGMET, not more than 6 hours from the time of transmission of WC, WV SIGMET;

The MWO transmit SIGMETs, as well as SIGMETs of adjacent MWOs to the ACC of the FIR concerned.

8.2 Aerodrome warning

Noi Bai, Da Nang, Tan Son Nhat MET Centres – Aeronautical Meteorological Centre – Viet Nam Air Traffic Management Corporation (VATM) shall issue aerodrome warnings for airports of responsibility if one of the following phenomena occurs or is expected to occur at aerodrome:

  1. Tropical cyclone;

  2. Thunderstorm;

  3. Hail;

  4. Strong winds;

  5. Gusts;

  6. Squall.

The aerodrome warnings are issued in English and Vietnamese and are distributed in accordance with a distribution list agreed upon locally.

9  OTHER AUTOMATED METEOROLOGICAL SERVICES

NIL

10  FORECASTS AND WARNINGS

10.1 

Noi Bai, Da Nang, Tan Son Nhat MET Centres and the MWO shall provide weather forecasts and warnings for civil aeronautical operations within assigned responsibility area at the aerodromes, TMAs and Viet Nam FIRs.

10.2 Weather forecasts and warnings comprise:

  1. Aerodrome forecasts (TAF, TAF AMD);

  2. Landing forecasts TREND;

  3. Forecasts for take-off;

  4. Upper-air forecasts (upper wind and upper-air temperature; SIGWX phenomena…);

  5. SIGMET;

  6. Aerodrome warnings (AD WRNG);

  7. Wind shear warnings (WS WRNG).