WCPA12 PHFO 121520 WSTPAY KZAK SIGMET YANKEE 5 VALID 121517/121905 PHFO- OAKLAND OCEANIC FIR CNL SIGMET YANKEE 4 VALID 121305/121905. TC USAGI HAS EXITED OAKLAND FIR. REFER TO WC SIGMETS ISSUED BY PAGASA.