FZPQ50 PGUM 120729 SRFGUM Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 529 PM ChST Fri Dec 12 2025 .DISCUSSION...There is a moderate risk of rip currents along north and east facing reefs. A stronger swell pulse is expected to move through the region around Saturday night, the surf is expected to rise by a foot or two, maybe even 3 feet in some areas. This pulse may warrant a High Surf Advisory (HSA) and elevate the Risk of Rip Currents to high (HRRC) for Tinian and Saipan. Around the middle of next week another north swell pulse may move through the region. $$ GUZ001-MPZ001>003-122200- Guam-Rota-Tinian-Saipan- 529 PM ChST Fri Dec 12 2025 36 hour Surf Zone Forecast for the Marianas from 600 PM Friday through 600 AM Sunday .TONIGHT... Rip Current Risk.....Moderate *. Surf Height North facing reefs............6 to 8 feet. East facing reefs............6 to 8 feet. South facing reefs............2 to 4 feet. West facing reefs............2 to 4 feet. Swell/Period Primary swell................East at 5 to 6 feet. Primary period...............10 seconds. Secondary swell..............Northeast at around 3 feet. Secondary period.............10 seconds. Water Temperature Ritidian buoy..........85 Degrees. Winds...............East at 10 to 20 mph. .SATURDAY... Rip Current Risk.....Moderate *. Surf Height North facing reefs............6 to 8 feet. East facing reefs............6 to 8 feet. South facing reefs............2 to 4 feet. West facing reefs............2 to 4 feet. Swell/Period Primary swell................East at 5 to 6 feet. Primary period...............9 seconds. Secondary swell..............Northeast at around 3 feet. Secondary period.............10 seconds. Max Heat Index.........Around 100. Winds...............Breezy. East at 15 to 25 mph. .SATURDAY NIGHT... Rip Current Risk.....Moderate *. Surf Height North facing reefs............6 to 8 feet. East facing reefs............6 to 8 feet. South facing reefs............2 to 4 feet. West facing reefs............2 to 4 feet. Swell/Period Primary swell................East at 5 to 6 feet. Primary period...............8 seconds. Secondary swell..............Northeast at around 3 feet. Secondary period.............8 to 9 seconds. Winds...............East at 15 to 20 mph. Tide information for the next 36 hours... At Apra Harbor, Guam... Low tide 0.8 feet at 9:08 PM Friday High tide 1.4 feet at 2:08 AM Saturday Low tide 0.6 feet at 8:05 AM Saturday High tide 2.1 feet at 3:03 PM Saturday Low tide 0.5 feet at 10:02 PM Saturday High tide 1.4 feet at 4:00 AM Sunday At Rota Island... Low tide 0.8 feet at 9:02 PM Friday High tide 1.3 feet at 2:05 AM Saturday Low tide 0.5 feet at 7:59 AM Saturday High tide 2.0 feet at 3:00 PM Saturday Low tide 0.5 feet at 9:56 PM Saturday High tide 1.3 feet at 3:57 AM Sunday At Tinian Island... Low tide 0.3 feet at 8:45 PM Friday High tide 1.0 feet at 2:06 AM Saturday Low tide 0.2 feet at 7:42 AM Saturday High tide 1.5 feet at 3:01 PM Saturday Low tide 0.2 feet at 9:39 PM Saturday High tide 1.0 feet at 3:58 AM Sunday At Tanapag Harbor, Saipan... Low tide 0.9 feet at 9:32 PM Friday High tide 1.4 feet at 2:29 AM Saturday Low tide 0.8 feet at 8:17 AM Saturday High tide 2.1 feet at 3:12 PM Saturday Low tide 0.6 feet at 10:19 PM Saturday High tide 1.5 feet at 4:33 AM Sunday * Low Risk of rip currents - Strong currents can still occur near jetties and reef channels. Always have a flotation device with you in the water. Moderate Risk of rip currents - Wave conditions support stronger or more frequent rip currents. Always have a flotation device with you in the water. High Risk of rip currents - Large waves will produce strong rip currents, especially along narrow reefs and beaches. Rip currents will be life threatening. If caught in a rip current, swim parallel to the beach rather than against the current. $$