WCPA13 PHFO 151311 WSTPAZ KZAK SIGMET ZULU 7 VALID 151311/151315 PHFO- OAKLAND OCEANIC FIR CNL SIGMET ZULU 6 VALID 150715/151315. TC NAMTHEUN HAS EXITED OAKLAND OCEANIC FIR. REFER TO SIGMETS ISSUED BY JAPAN METEOROLOGICAL AGENCY.