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WSID20 WIII 181810

WIIF SIGMET 24 VALID 181810/182110 WIII-
WIIF JAKARTA FIR EMBD TS OBS WI N0307 E09646 - S0144 E09937 - S0217 E09914 - N0029 E09515 - N0308 E09439 - N0307 E09646 TOP FL520 MOV W 15KT NC=