WCDR31 MDSD 190034 WSCA31 MDSD 190030 MDCS SIGMET 3 VALID 190030/190630 MDSD- SANTO DOMINGO FIR TC FIONA PSN N1810 W06780 CB OBS AT 0020Z WI 80NM OF TC CENTRE TOP FL550 MOV WNW 07KT INTSF FCST AT 0030Z TC CENTRE N1850 W06850=