afi met bulletins exchange (ambex) handbook - ICAO

AFI Regional SIGMET Guide Page16/60
3.4.3.1.7 Expected changes in intensity(Column 7)
The expected evolution of the phenomenon’s intensity is indicated by one of the
following abbreviations:
INTSF – intensifying
WKN – weakening
NC – no change
3.4.4 Structure of the meteorological part of VA SIGMET
3.4.4.1 The general structure of the meteorological part of the SIGMET message is given in the
table below:
Start of the second line of the message
1 2 3
FIR/UIR or CTA
Phe
nome
non
Name
Volcano
Location
Volcanic ash cloud
observed or forecast
VA [ERUPTION] [MT [LOC ] VA CLD OBS AT
FIR [/UIR][CTA]
]
Z
VA CLD FCST
4 5
Vertical
Extent of the cloud
Horizontal Position
Expected movement
FL [APRX KM[NM] BY [ - - …] MOV
KM[NM]]
6
Volcanic ash cloud forecast at the end of the period of validity
FCST time Position
FCST Z VA CLD APRX - - …
3.4.4.2 Name and location of the volcano and/or indicator for VA cloud(Column 2)
VA [ERUPTION] [MT ] [LOC ] VA CLD
or
VA CLD
3.4.4.2.1 The description of the volcano injecting volcanic ash consists of the following elements:
- starts with the abbreviation VA – volcanic ash;
- the word ERUPTION is used when the SIGMET is issued for a known volcanic
eruption;
- geographical/location information:
September 2007 Amend1/2010 Ninth Edition