WVMX31 MMMX 181205
MMEX SIGMET 1 VALID 181200/181800 MMMX-
MMFR MEXICO FIR VA POPOCATEPETL PSN N1901 W09837 OBS
 AT 181200Z
VA CLD BTN SFC/FL210 WI N1901 W09837 - N1901 W09909 - N1855 W09908 - N1901
         W09837
MOV SE 15 KT NC.
OUTLK AT 18/1800Z VA CLD BTN SFC/FL210 WI N1901 W09836 - N1815 W09758 - N1807
         W09821 - N1901 W09836
AFFECTED AIRWAYS ARRIVAL LARLO=