


Surf Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
030 FZPQ50 PGUM 240431 SRFGUM Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 231 PM ChST Thu Jul 24 2025 .DISCUSSION...Tropical Depression 12W will bring hazardous surf conditions across the Marianas. A high risk of rip currents along east facing reefs will shift to west and south facing reefs tonight into Friday and will likely continue through Saturday night. A moderate risk of lighting will continue through the weekend into next week. $$ GUZ001-241945- Guam- 231 PM ChST Thu Jul 24 2025 ...HIGH RISK OF RIP CURRENTS THROUGH LATE TONIGHT ALONG EAST FACING REEFS... ...HIGH RISK OF RIP CURRENTS FROM 6 PM THIS EVENING TO 6 AM CHST SUNDAY ALONG SOUTH AND WEST FACING REEFS... ...HIGH SURF ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 6 AM CHST SUNDAY ALONG SOUTH AND WEST FACING REEFS... 36 hour Surf Zone Forecast for the Marianas from 600 PM Thursday through 600 AM Saturday .TONIGHT... Rip Current Risk.....High *. Surf Height North facing reefs............4 to 6 feet. East facing reefs............7 to 9 feet. South facing reefs............8 to 10 feet. West facing reefs............8 to 10 feet. Swell/Period Primary swell................Southwest at 7 to 9 feet. Primary period...............8 to 9 seconds. Secondary swell..............East at around 3 feet. Secondary period.............9 seconds. Water Temperature Ritidian buoy..........86 Degrees. Winds...............Windy. Southwest at 25 to 30 mph. Gusts to 40 mph. .FRIDAY... Rip Current Risk.....High. Pounding surf will produce life threatening rip currents at reefs and beaches. Surf Height North facing reefs............5 to 7 feet. East facing reefs............5 to 7 feet. South facing reefs............7 to 9 feet. West facing reefs............9 to 11 feet. Swell/Period Primary swell................West to southwest at 7 to 9 feet. Primary period...............8 to 9 seconds. Secondary swell..............East at around 3 feet. Secondary period.............9 seconds. Max Heat Index.........Around 94. Winds...............Windy. Southwest at 25 to 30 mph. Gusts to 40 mph. .FRIDAY NIGHT... Rip Current Risk.....High *. Surf Height North facing reefs............6 to 8 feet. East facing reefs............3 to 5 feet. South facing reefs............7 to 9 feet. West facing reefs............8 to 10 feet. Swell/Period Primary swell................West to southwest 6 to 8 feet. Primary period...............8 to 9 seconds. Secondary swell..............East at around 2 feet. Secondary period.............9 seconds. Winds...............Windy. Southwest at 25 to 30 mph. Gusts to 40 mph. Tide information for the next 36 hours... At Apra Harbor, Guam... High tide 2.6 feet at 8:47 PM Thursday Low tide 1.8 feet at 1:54 AM Friday High tide 2.7 feet at 6:44 AM Friday Low tide -0.4 feet at 2:13 PM Friday High tide 2.6 feet at 9:24 PM Friday Low tide 1.7 feet at 2:42 AM Saturday High tide 2.6 feet at 7:34 AM Saturday $$ MPZ001>003-241945- Rota-Tinian-Saipan- 231 PM ChST Thu Jul 24 2025 ...TROPICAL STORM WATCH IN EFFECT... ...HIGH RISK OF RIP CURRENTS THROUGH LATE TONIGHT ALONG EAST FACING REEFS... ...HIGH RISK OF RIP CURRENTS FROM 6 PM THIS EVENING TO 6 AM CHST SUNDAY ALONG SOUTH AND WEST FACING REEFS... ...HIGH SURF ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 6 AM CHST SUNDAY ALONG SOUTH AND WEST FACING REEFS... Tropical Depression 12W west-northwest of Guam will turn north- northwest and pass west of the CNMI over the next couple of days, bringing hazardous surf conditions to the region through Saturday night. See the latest Typhoon Local Statement for specific information for each island. Tide information for the next 36 hours... At Rota Island... High tide 2.4 feet at 8:44 PM Thursday Low tide 1.7 feet at 1:48 AM Friday High tide 2.5 feet at 6:41 AM Friday Low tide -0.4 feet at 2:07 PM Friday High tide 2.4 feet at 9:21 PM Friday Low tide 1.6 feet at 2:36 AM Saturday High tide 2.5 feet at 7:31 AM Saturday At Tinian Island... High tide 1.7 feet at 8:42 PM Thursday Low tide 1.5 feet at 12:53 AM Friday High tide 2.0 feet at 5:42 AM Friday Low tide -0.5 feet at 1:45 PM Friday High tide 1.7 feet at 9:18 PM Friday Low tide 1.4 feet at 1:52 AM Saturday High tide 1.9 feet at 6:35 AM Saturday At Tanapag Harbor, Saipan... High tide 2.3 feet at 9:09 PM Thursday Low tide 1.7 feet at 2:05 AM Friday High tide 2.2 feet at 6:37 AM Friday Low tide -0.6 feet at 2:20 PM Friday High tide 2.3 feet at 9:47 PM Friday Low tide 1.6 feet at 3:00 AM Saturday High tide 2.2 feet at 7:35 AM Saturday * 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. $$