WCMX31 MMMX 270246
MMEX SIGMET 1 VALID 270242/270842 MMMX-
MMFR MEXICO FIR TC SONIA OBS
N1460 W12000  AT 0242Z
OCNL TS TOP FL430 WI 100NM OF CENTRE
MOV WNW 05KT .
FCST AT 270900 N1412 W12018 =