WSHO31 MHTG 210540 MHTG SIGMET A3 VALID 210540/210940 MHTG- MHCC CENTRAL AMERICAN FIR EMBD TS OBS AT 0530Z WI N0843 W09831 - N1011 W09259 - N0623 W09116 - N0447 W09653 - N0611 W09849 TOP FL500 MOV W 05KT NC=