day of the month, GG is the hour, and gg is the minute. |- | CCCC- || The 4-character ICAO location of the dissmenating office followed by a hyphen. |}Notes [a] – if it a convective SIGMET, then this will read SIG[E/C/W] CONVECTIVE SIGMET ##[E/C/W]. Where E/C/W indicates whether it's over the Eastern, Central, or Western United States, and ## indicates the number of the convective SIGMET issued for that region. Body The main body of a SIGMET can be much more variable, and consists ofCCCC [FIR/CTA list] <Phenomenon> OBS/FCST [AT GGggZ] <Location> <Level> [MOV XXX xx KT/KMH] [INTSF/WKN/NC] [FCST AT <GGgg>Z <location>]=CCCC [FIR/CTA list] is again the 4-character ICAO location, followed by the affected flight or control regions.<Phenomenon> is a code describing the meteorological phenomena as follows: If it is a convective SIGMET, the following codes may appearOBS/FCST [AT GGggZ] indicates whether the phenomenon is observed (OBS) or forecasted (FCST), and the Zulu hour and minute that it was observed or will be forecasted.<Location> is a general description of location of the meteorological phenomenon, typically utilizing latitude and longitudinal coordinates.<Level> helps denote the altitude that the phenomenon will be occurred, and can be expressed as[MOV XXX xx KT/KMH] if it is a moving front, the direction and rate of movement given as a compass direction (XXX, e.g. "N" or "WNW"), and the rate is given in KT (or KMH). Sometimes STNR (Stationary) may be used instead if no significant movement is expected.[INTSF/WKN/NC] denotes the change in strength over time.[FCST AT <GGgg>Z <location>] helps note where the front is expected to be at the end of the SIGMET's validity period. SIGMET Renewal and Cancellation If when the validity period is due to expire but the phenomenon is expected to persist, a new sequence number is added to the SIGMET to renew it. If during the validity period of a SIGMET, the SIGMET is to be cancelled, the following replaces the SIGMET messageCNL SIGMET [n][n]n YYGGgg/YYGGgg Examples WSUS32 KKCI 071655 An en-route weather phenomenon in the U.S., observed by Kansas City International airport on the 7th of August, at 16:55 UTC SIGC CONVECTIVE SIGMET 83C This is a convective weather pattern in the central region of the continguous U.S. with sequence number 83C VALID UNTIL 1855Z That is valid until 18:55 UTC MI IN WI IL IA LM That covers Minnesota, Indiana, Wisconsin, Illinois, Iowa, and Lower Michigan flight regions FROM