Template for advisory for volcanic ash

Key:

M      =        inclusion mandatory;

O       =        inclusion optional;

C       =        inclusion conditional, included whenever applicable.

Note 1: The ranges and resolutions for the numerical elements included in volcanic ash advisory are shown in Appendix 8.

Note 2: The explanations for the abbreviations can be found in ICAO Doc 8400 Procedures for Air Navigation Services — ICAO Abbreviations and Codes (PANS-ABC).

Note 3: The inclusion of a colon (‘:’) after each element heading is mandatory.

Note 4: Row numbers in the ‘Ref.’ column are included only for clarity and ease of reference, and are not part of the advisory for volcanic ash.

1

Identification of the type of message (M)

Type of message

VA ADVISORY

2

New line

3

Status indicator (C) ([112])

Indicator of test or exercise

STATUS:

TEST or EXER

4

New line

5

Time of origin (M)

Year, month, day, time in UTC

DTG:

nnnnnnnn/nnnnZ

6

New line

7

Name of VAAC (M)

Name of VAAC

VAAC:

nnnnnnnnnnnn

8

New line

9

Name of volcano (M)

Name and International Association of Volcanology and Chemistry of the Earth’s Interior number of volcano

VOLCANO:

nnnnnnnnnnnnnnnnnnnnnn [nnnnnn]

or UNKNOWN

or UNNAMED

10

New line

11

Location of volcano (M)

Location of volcano in degrees and minutes

PSN:

Nnnnn or Snnnn Wnnnnn or Ennnnn

or UNKNOWN

12

New line

13

State or region (M)

State, or region if ash is not reported over a State

AREA:

nnnnnnnnnnnnnnnn or UNKNOWN

14

New line

15

Summit elevation (M)

Summit elevation in m (or ft)

SUMMIT ELEV:

nnnnM (or nnnnnFT)

or SFC

or UNKNOWN

16

New line

17

Advisory number (M)

Advisory number: year in full and message number (separate sequence for each volcano)

ADVISORY NR:

nnnn/nnnn

18

New line

19

Information source (M)

Information source using free text

INFO SOURCE:

Free text up to 32 characters

20

New line

21

Colour code (O)

Aviation colour code

AVIATION COLOUR CODE:

RED or ORANGE or YELLOW or GREEN or UNKNOWN or NOT GIVEN or NIL

22

New line

23

Eruption details (M) ([113])

Eruption details (including date/time of eruption(s))

ERUPTION DETAILS:

Free text up to 64 characters

or UNKNOWN

24

New line

25

Time of observation (or estimation) of volcanic ash clouds (M)

Day and time (in UTC) of observation (or estimation) of volcanic ash clouds

OBS (or EST) VA DTG:

nn/nnnnZ

26

New line

27

Observed or estimated volcanic ash clouds (M)

Horizontal (in degrees and minutes) and vertical extent at the time of observation of the observed or estimated volcanic ash clouds or, if the base is unknown, the top of the observed or estimated volcanic ash clouds;

Movement of the observed or estimated volcanic ash clouds

OBS VA CLD or EST VA CLD:

TOP FLnnn or SFC/FLnnn or FLnnn/nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)] Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ –  Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]]

MOV N nnKMH (or KT) or

MOV NE nnKMH (or KT) or

MOV E nnKMH (or KT) or

MOV SE nnKMH (or KT) or

MOV S nnKMH (or KT) or

MOV SW nnKMH (or KT) or

MOV W nnKMH (or KT) or

MOV NW nnKMH (or KT)

or

VA NOT IDENTIFIABLE FM SATELLITE DATA

WIND FLnnn/nnn nnn/nn[n]KT ([114]) or WIND FLnnn/nnn VRBnnKT or WIND SFC/FLnnn nnn/nn[n]KT or WIND SFC/FLnnn VRBnnKT

28

New line

29

Forecast height and position of the volcanic ash clouds
(+6 HR) (M)

Day and time (in UTC)
(6 hours from the ‘Time of observation (or estimation) of volcanic ash clouds’ given in Item 12)

Forecast height and position (in degrees and minutes) for each volcanic ash cloud mass for that fixed valid time

FCST VA CLD +6 HR:

nn/nnnnZ

SFC or FLnnn/[FL]nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)]Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]] ([115]),([116])

or NO VA EXP

or NOT AVBL

or NOT PROVIDED

30

New line

31

Forecast height and position of the volcanic ash clouds (+12 HR) (M)

Day and time (in UTC)
(12 hours from the ‘Time of observation (or estimation) of volcanic ash clouds’ given in Item 12)

Forecast height and position (in degrees and minutes) for each volcanic ash cloud mass for that fixed valid time

FCST VA CLD +12 HR:

nn/nnnnZ

SFC or FLnnn/[FL]nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)] Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]] ([117]),([118])

or NO VA EXP

or NOT AVBL

or NOT PROVIDED

32

New line

33

Forecast height and position of the volcanic ash clouds

(+18 HR)

Day and time (in UTC)
(18 hours from the ‘Time of observation (or estimation) of volcanic ash clouds’ given in Item 12)

Forecast height and position (in degrees and minutes) for each volcanic ash cloud mass for that fixed valid time

FCST VA CLD +18 HR:

nn/nnnnZ

SFC or FLnnn/[FL]nnn [nnKM WID LINE BTN (nnNM WID LINE BTN)] Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn][ – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] – Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] ([119]),([120])

or NO VA EXP

or NOT AVBL

or NOT PROVIDED

34

New line

35

Remarks (M) ([121])

Remarks, as necessary

RMK:

Free text up to 256 characters

or NIL

36

New line

37

Next advisory (M)

Year, month, day and time in UTC

NXT ADVISORY:

nnnnnnnn/nnnnZ

or NO LATER THAN nnnnnnnn/nnnnZ

or NO FURTHER ADVISORIES

or WILL BE ISSUED BY nnnnnnnn/nnnnZ