The National Weather Service in Honolulu has issued a HIGH SURF WARNING for NORTH FACING SHORES of MOLOKAI and MAUI and WEST FACING SHORES of MOLOKAI in effect until 6 p.m. Monday.The HIGH SURF ADVISORY is NO LONGER IN EFFECT.A low pressure system in the north Pacific has generated a large northwest swell that will build across Hawaiian waters through tonight. This swell will produce dangerous high surf along exposed north and west facing beaches.A High Surf Warning indicates that dangerous, battering waves will pound the shoreline. This will result in very dangerous swimming conditions, and deadly rip currents.EFFECTS: Surf will build to 20 to 30 feet along north facing shores of Molokai and Maui, and 15 to 20 feet along west facing shores of Molokai. Surf will be building rapidly now through tonight reaching 20 to 30 feet with larger set waves for many areas by sunrise tomorrow. Large and hazardous surf will persist through Sunday night then subside to 15 to 20 feet Monday. Surf will be below advisory levels by Monday evening.Forecast surf heights are estimates of the height of the face or front of waves.PRECAUTIONARY MEASURES: EXPECT OCEAN WATER OCCASIONALLY SWEEPING ACROSS PORTIONS OF BEACHES, VERY STRONG BREAKING WAVES AND STRONG RIP CURRENTS. BREAKING WAVES MAY MAKE NAVIGATING SOME HARBOR CHANNELS DIFFICULT. BEACHGOERS, SWIMMERS AND SURFERS SHOULD HEED ALL ADVICE GIVEN BY OCEAN SAFETY OFFICIALS AND EXERCISE CAUTION.INFORMATION: Maui County Civil Defense will continue to monitor the situation. Please listen to your local radio and TV stations or NOAA Weather Radio broadcasts for any updates. NOAA Weather Broadcasts can be reached by calling 1-866-944-5025. NOAA Weather Internet services can be found at www.prh.noaa.gov/hnl.Pre-recorded advisories and notifications are available 24-hours a day on the Maui County Automated Information System (AIS) by calling 986-1200.