FZPQ50 PGUM 191803 SRFGUM Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 403 AM ChST Wed Aug 20 2025 .DISCUSSION...There will be a moderate risk of rip currents along east facing reefs through Friday, which could become low along all reefs for the weekend. There will also be a moderate risk of lightning through the weekend. $$ GUZ001-MPZ001>003-200915- Guam-Rota-Tinian-Saipan- 403 AM ChST Wed Aug 20 2025 36 hour Surf Zone Forecast for the Marianas from 600 AM Wednesday through 600 PM Thursday .TODAY... Rip Current Risk.....Moderate *. Surf Height North facing reefs............2 to 4 feet. East facing reefs............4 to 6 feet. South facing reefs............2 to 4 feet. West facing reefs............Around 1 foot. Swell/Period Primary swell................East at 3 to 4 feet. Primary period...............8 seconds. Water Temperature Ritidian buoy..........86 Degrees. Max Heat Index.........Around 102. Winds...............East at around 10 mph. .TONIGHT... Rip Current Risk.....Moderate *. Surf Height North facing reefs............1 to 3 feet. East facing reefs............3 to 5 feet. South facing reefs............1 to 3 feet. West facing reefs............Around 1 foot. Swell/Period Primary swell................East at 2 to 3 feet. Primary period...............8 seconds. Winds...............East at around 10 mph. .THURSDAY... Rip Current Risk.....Moderate *. Surf Height North facing reefs............1 to 3 feet. East facing reefs............3 to 5 feet. South facing reefs............1 to 3 feet. West facing reefs............Around 1 foot. Swell/Period Primary swell................East at 2 to 3 feet. Primary period...............8 seconds. Max Heat Index.........Around 100. Winds...............East at 10 to 15 mph. Tide information for the next 36 hours... At Apra Harbor, Guam... High tide 2.4 feet at 3:44 AM Wednesday Low tide -0.2 feet at 11:30 AM Wednesday High tide 2.4 feet at 7:04 PM Wednesday Low tide 1.7 feet at 12:06 AM Thursday High tide 2.5 feet at 4:55 AM Thursday Low tide -0.2 feet at 12:25 PM Thursday High tide 2.5 feet at 7:41 PM Thursday At Rota Island... High tide 2.3 feet at 3:41 AM Wednesday Low tide -0.2 feet at 11:24 AM Wednesday High tide 2.3 feet at 7:01 PM Wednesday Low tide 1.6 feet at 12:00 AM Thursday High tide 2.3 feet at 4:52 AM Thursday Low tide -0.2 feet at 12:19 PM Thursday High tide 2.3 feet at 7:38 PM Thursday At Tinian Island... Low tide -0.4 feet at 11:02 AM Wednesday High tide 1.6 feet at 6:54 PM Wednesday Low tide 1.3 feet at 10:58 PM Wednesday High tide 1.8 feet at 3:48 AM Thursday Low tide -0.4 feet at 11:54 AM Thursday High tide 1.6 feet at 7:27 PM Thursday Low tide 1.3 feet at 11:56 PM Thursday At Tanapag Harbor, Saipan... High tide 2.1 feet at 3:28 AM Wednesday Low tide -0.4 feet at 11:30 AM Wednesday High tide 2.2 feet at 7:20 PM Wednesday Low tide 1.6 feet at 11:52 PM Wednesday High tide 2.1 feet at 4:48 AM Thursday Low tide -0.4 feet at 12:25 PM Thursday High tide 2.2 feet at 7:56 PM Thursday * 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.$$