Airmet examples

UKBV AIRMET 2 VALID 151410/151800 UKВВ-
KYIV FIR MOD ICE FCST 1000/1800 М AGL W OF Е030 MOV NE 20 KMH NC

 

UKNV AIRMET 2 VALID 151410/151800 UKNN- UKNV NATIONAL FIR MOD ICE FCST W OF E030 200/1200M AGL MOV NE20 KMH NC= UKNV AIRMET 3 VALID 151600/151800 UKNN- UKNV NATIONAL FIR CNL AIRMET 2 151410/151800

VVEE AIRMET 2 VALID 221215/221600 VVWW SHEREMETJEVO FIR MOD TURB OBS AT120548 DEG N 10 DEG EAT FL 080 NC

 

WAOS41 LOWM LOVV AIRMET 4 VALID 031100/031500 LOWW-
WIEN FIR LOC MOD ICE FCST BLW 5000FT MSL. NC.=

WAOS41 LOWM LOVV AIRMET 5 VALID 031500/031900 LOWW-WIEN FIR LOC MOD ICE FCST IN LOW STRATUS BLW 5000FT MSL ESPECIALLY SOUTH EAST OF ALPS AND DUE TO FZDZ. NC.=

2.5. Significant meteorological information (sigmet)

SIGMETs are aviation weather warnings for subsonic, transonic and supersonic cruising levels.

The SIGMET information is composed for entire FIR unless any restriction is given.

The SIGMET information is issued by a meteorological watch office concerning the occurrence or expected occurrence of specified en-route weather phenomena which may affect the safety of aircraft operations and the development of those phenomena in time and space.

The SIGMET information is given in open plain language using the accepted ICAO abbreviations. SIGMET information shall be cancelled when the phenomena are no longer expected to occur in the area. The general SIGMET format is given in Table 8.

In a special case of SIGMET message for volcanic ash and tropical cyclones it is recommended to include outlook giving information for up to 12 hours beyond the period of validity concerning the trajectory of the volcanic ash and position of the tropical cyclone centre. This outlook should be based on advisory information provided by meteorological centres designated by regional air navigation agreement.

It is recommended to desseminate SIGMET to meteorological watch offices, World Area Forecast Centres (WAFC) and Regional Area Forecast Centres (RAFC) and to other meteorological offices in accordance with regional air navigation agreement.

The information shall be indicated using one of the following as appropriate:

 

1) at subsonic cruising levels (up to 13 km):

 

Thunderstorm	TS
Obscured	OBSC TS
Embedded	EMBD TS
Frequent	FRQ TS
Squall line	SQL TS
Obscured with heavy hail	ОBSC TSGR
Embedded with heavy hail	EMBD TSGR
Frequent with heavy hail	FRQ TSGR
Squall line with heavy hail	SQL TSGR
Tropical cyclone
Tropical cyclone with 10-minute mean surface wind speed of 63 KPH (34 KT) or more	TC + cyclone name
Turbulence
Severe turbulence	SEV TURB
Icing
Severe icing	SEV ICE
Severe icing due to freezing rain	SEV ICE (FZRA)
Mountain wave
Severe mountain wave	SEV MTW
Duststorm
Heavy duststorm	HVY DS
Sandstorm
Heavy sandstorm	HVY SS
Volcanic ash	VA + volcano name, if known

 

2) at transonic and supersonic cruising levels:

 

Turbulence
Moderate turbulence	MOD TURB
Severe turbulence	SEV TURB
Cumulonimbus	CB
Isolated CB	ISOL CB
Occasional CB	OCNL CB
Frequent CB	FRQ CB
Hail	GR
Volcanic ash	VA + volcano name, if known

 

Table 8