361 WVMX31 MMMX 280434 CCA MMEX SIGMET 1 VALID 280408/281008 MMMX- MMFR MEXICO FIR VA POPOCATEPETL PSN N1901 W09837 OBS AT 280408Z VA CLD BTN SFC/FL210 N1910 W09913 - N1901 W09836 - N1900 W09837 - N1901 W09914 - N1910 W09913 MOV W AT 15-20KT. NC. OUTLK AT 28/0830Z VA CLD BTN SFC/FL210 N1916 W09907 - N1901 W09835 - N1900 W09837 - N1908 W09911 - N1916 W09907 =