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JTWC Summary: TYPHOON 33W (USAGI), LOCATED APPROXIMATELY 180 NM EAST-SOUTHEAST OF HO CHI MINH, VIETNAM, HAS TRACKED WEST-SOUTHWESTWARD AT 08 KNOTS OVER THE PAST SIX HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 240000Z IS 20 FEET. NEXT WARNINGS AT 240900Z, 241500Z, 242100Z AND 250300Z.