WSHO31 MHTG 190521 MHTG SIGMET I1 VALID 190521/190921 MHTG- MHCC CENTRAL AMERICAN FIR EMBD TS OBS AT 0510Z WI N1431 W08917 - N1352 W08824 - N1241 W08917 - N1326 W09021 TOP FL500 STNR NC=