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SIGMET - DESCRIPTION 16:37 28.05.2012

 
SIGMET information (Significant Meteorological Information) shall be issued by meteorological watch office and shall give a concise description in abbreviated plain language concerning the occurrence and/or expected occurrence of specified en-route weather phenomena, which may affect the safety of aircraft operations, and of the development of those phenomena in time and space. Definition published in Annex 3 ICAO .

Code group Code group specifications Meaning Examples
SIGMET Information indicator Information name SIGMET
EPWW Location indicator ICAO indication for ATS unit operating for this FIR for which the SIGMET was issued EPWW
SIGMET 1 Identification Information identification and the next number SIGMET 1
VALID 030200/030600 Validity period First two numbers indicate a day of the month, next four numbers indicate information validity period in UTC (for example 1230, 1630) VALID 221215/221600
VALID 101520/101800
EPWA- Location indicator of Meteorological Watch Office originating the message with a separating hyphen Aerodrome ICAO code where MWO is located EPWA-
EPWW WARSAW FIR Name of the FIR Name of the FIR for which the SIGMET is issued EPWW WARSAW FIR
SEV ICE Phenomenon Description of a weather phenomenon causing the issuance of SIGMET. Heavy weather phenomena at all cruising levels OBSC TS, EMBD TS, FRQ TS, SQL TS
SEV TURB, SEV ICE, SEV ICE (FZRA), SEV MTW
EMBD TSGR
OBS/FCST Observed or forecast phenomenon Indication whether the information is observed and expected to continue, or forecast OBS
FCST
OBS AT 1210Z
W AND CENTRAL PART OF POLAND Location Location referring to FIR, latitude and longitude in degrees and minutes or locations or geographic features well known internationally S OF 54
N PART A1
OVER N AND W PART OF POLAND
BTN FL010/160 Level Flight level or altitude or extent FL180
BLW FL200
TOP ABV FL100
MOV E Movement or expected movement Movement or expected movement (direction and speed) with reference to 8 points of compass SLW MOV N
MOV SE
WKN Expected changes in intensity INTSF or WKN or NC WKN
CNL SIGMET Cancellation of SIGMET referring to its identification Type of cancellation is given information and the identification CNL SIGMET 1 101200/101430
 
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