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Volcanic Ash Advisory (FVFE01)

Volcanic Ash Advisory (FVFE01) information includes the name, location and summit elevation of the volcano in question, the region in which it is located, the advisory number, the information source, the time of eruption, the current volcanic ash distribution and a related forecast, and other associated data. The information is updated as a minimum at six-hour intervals (normally at 00, 06, 12 and 18 UTC). Volcano information in VAAs (such as names, locations and volcano numbers) is as per the VAA database maintained by ICAO. The FVFE01 format is described below.

FVFE01 format

FVFE01 RJTD DDhhmm Header, location indicator, date/time of volcanic ash advisory issuance
VA ADVISORY Type of message
DTG Time of origin (year, month, date, time in UTC)
VAAC VAAC name
VOLCANO Volcano name and number
PSN Volcano location (degrees and minutes)
AREA Volcano location (state or region)
SUMMIT ELEV Volcano summit elevation
ADVISORY NR Year of issuance and advisory number (consecutive numbers for each volcano starting with 1 for the first advisory)
INFO SOURCE Information source
AVIATION COLOUR CODE Aviation colour code (NIL — unused by Tokyo VAAC)
ERUPTION DETAILS Date, time and other details of eruption
OBS VA DTG Date and time of volcanic ash observation (UTC)
OBS VA CLD Horizontal (degrees and minutes) and vertical extent of ash clouds and related direction/speed at the time of observation. If no ash cloud is identifiable from satellite imagery, wind direction and speed at the reported ash top height are given.
FCST VA CLD Forecast height and area (degrees and minutes) of ash clouds 6, 12 and 18 hours ahead of the time of observation. The forecast date and time are also given (UTC).
RMK Remarks as necessary
NXT ADVISORY Time, date, month and year of next advisory (UTC)

Example of FVFE01

FVFE01 RJTD 251850
VA ADVISORY
DTG: 20160325/1850Z
VAAC: TOKYO
VOLCANO: SAKURAJIMA (AIRA CALDERA) 282080
PSN: N3136 E13039
AREA: JAPAN
SUMMIT ELEV: 1117M
ADVISORY NR: 2016/74
INFO SOURCE: HIMAWARI-8 JMA
AVIATION COLOUR CODE: NIL
ERUPTION DETAILS: EXPLODED AT 20160325/1748Z FL120 EXTD E
OBS VA DTG: 25/1820Z
OBS VA CLD: SFC/FL120 N3137 E13044 - N3142 E13048 - N3138 E13055 -
N3134 E13048 MOV E 30KT
FCST VA CLD +6 HR: 26/0020Z SFC/FL120 N3203 E13205 - N3234 E13333 -
N3251 E13418 - N3242 E13431 - N3152 E13233 - N3113 E13126 - N3058
E13008
FCST VA CLD +12 HR: 26/0620Z SFC/FL120 N3242 E13313 - N3302 E13702 -
N3333 E13752 - N3334 E13822 - N3236 E13651 - N3218 E13329 - N3146
E13225 - N3044 E13124 - N3033 E12958
FCST VA CLD +18 HR: NO VA EXP
RMK: NIL
NXT ADVISORY: 20160326/0000Z=

Volcanic Ash Graphic (VAG)

Volcanic Ash Graphic (VAG) information shows the current volcanic ash distribution and a related forecast for 6, 12 and 18 hours ahead, and can be used to assess the future impact of volcanic ash on air routes. VAG information is updated as a minimum at six-hour intervals for as long as the volcanic ash cloud is identified in satellite imagery. Ash bottom/top heights are also given for each volcanic ash cloud.

Example of VAG

Volcanic Ash Graphic for Initial Distribution (VAGI)

Volcanic Ash Graphic for Initial Distribution (VAGI) information shows the latest extent of volcanic ash to help clarify its current impact on air routes.

Example of VAGI

Volcanic Ash Graphic Forecast for Narrow Area (VAGFN)

Volcanic Ash Graphic Forecast for Narrow Area (VAGFN) information shows hourly volcanic ash trajectory forecast distributions for domestic volcanoes up to six hours ahead by height (surface-FL180 and FL180-FL550). It is updated as a minimum at six-hour intervals, and can be used to assess the future impact of volcanic ash on domestic air routes in detail.

Example of VAGFN

Volcanic Ash Graphic Forecast for Narrow Area of Hypothetical Routine Eruption (VAGFNR)

Volcanic Ash Graphic Forecast for Narrow Area of Hypothetical Routine Eruption (VAGFNR) information shows hourly volcanic ash trajectory hypothetical forecast distributions for volcanoes in Tokyo VAAC‘s area of responsibility thought to be at high risk of eruption with the assumption of a continuous eruption. It provides forecasts up to six hours ahead for heights from the surface to FL180 at six-hour intervals (00, 06, 12 and 18 UTC), and can be used to assess the future impact of volcanic ash on air routes in the event of an eruption.

Example of VAGFNR

Volcanic Ash Graphic Forecast for Narrow Area of Hypothetical Routine Eruption and Ash Fall (VAGFNR-AF)

Volcanic Ash Graphic Forecast for Narrow Area of Hypothetical Routine Eruption and Ash Fall (VAGFNR-AF) information shows hourly volcanic ash trajectory and ash fall hypothetical forecast distributions for domestic volcanoes thought to be at high risk of eruption with the assumption of a continuous eruption. It provides forecasts up to three hours ahead by height (surface-FL100 and FL100-FL200) at three-hour intervals (00, 03, 06, 09, 12, 15, 18 and 21 UTC). The information can be used to assess the future impact of volcanic ash on air routes and nearby airports in the event of an eruption.

Example of VAGFNR-AF

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 VAG, VAGI, VAGFN and VAGFNR information was created using GSHHG (Global Self-consistent Hierarchical High-resolution Geography; Wessel, P., and W. H. F. Smith,
  A Global Self-consistent, Hierarchical, High-resolution Shoreline Database, J. Geophys. Res., 101, #B4, pp. 8741-8743, 1996).