Coastal Waters Forecast
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
627 FZCA52 TJSJ 171218 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 818 AM AST Sun Aug 17 2025 Puerto Rico and the U.S. Virgin Islands Waters AMZ700-180130- 818 AM AST Sun Aug 17 2025 .SYNOPSIS FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS WATERS... Erin`s outer bands producing thunderstorms with heavy rain and gusty winds across the regional waters. Based on the latest National Hurricane Center track forecast, the southern portion of Erin eyewall will continue to move away from our Atlantic waters late this morning. Although Erin will continue to produce hazardous swell action that will impact the Atlantic and Caribbean passages, we expect seas to slowly improve later today. Mariners and visitors are urged to remain in port today. $$ AMZ711-180130- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 818 AM AST Sun Aug 17 2025 ...TROPICAL STORM WARNING IN EFFECT... ...SMALL CRAFT ADVISORY IN EFFECT FROM 5 PM AST THIS AFTERNOON THROUGH LATE TONIGHT... .REST OF TODAY...Tropical storm conditions expected. Southwest winds 25 to 35 knots with gusts up to 50 knots. Seas 9 to 13 feet. Wave Detail: Northeast 13 feet at 12 seconds and south 7 feet at 6 seconds. Showers and scattered thunderstorms early this morning, then numerous showers with isolated thunderstorms this afternoon. .TONIGHT...South winds 20 to 25 knots, diminishing to 15 to 20 knots after midnight. Gusts up to 35 knots. Seas 7 to 10 feet. Wave Detail: South 6 feet at 6 seconds and northwest 6 feet at 9 seconds. .MONDAY...South winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 7 feet. Wave Detail: Southeast 5 feet at 7 seconds and northwest 5 feet at 10 seconds. Scattered showers. .MONDAY NIGHT...South winds 15 to 20 knots, becoming southeast 10 to 15 knots after midnight. Seas 5 to 7 feet. Wave Detail: Southeast 4 feet at 7 seconds and northwest 4 feet at 10 seconds. Scattered showers. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 6 feet. Wave Detail: Northwest 4 feet at 10 seconds and south 3 feet at 5 seconds. Scattered showers. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 11 seconds and east 3 feet at 8 seconds. Scattered showers. .WEDNESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 5 feet. .THURSDAY NIGHT...Northeast winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet. Winds and seas higher in and near thunderstorms. $$ AMZ712-180130- Coastal Waters of Northern Puerto Rico out 10 NM- 818 AM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF TODAY...Southwest winds 15 to 20 knots, increasing to 20 to 25 knots this afternoon. Seas 7 to 10 feet. Wave Detail: Northeast 10 feet at 13 seconds and north 7 feet at 9 seconds. Isolated thunderstorms. Numerous showers early this morning, then scattered showers late. .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 8 feet. Wave Detail: North 7 feet at 10 seconds and northeast 7 feet at 11 seconds. Scattered showers. .MONDAY...South winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave Detail: Northwest 5 feet at 10 seconds and east 3 feet at 10 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .MONDAY NIGHT...South winds 10 to 15 knots with gusts up to 20 knots, becoming southeast 5 to 10 knots after midnight. Seas 5 to 6 feet. Wave Detail: Northwest 4 feet at 10 seconds and east 2 feet at 8 seconds. Scattered showers in the evening. .TUESDAY...Southeast winds 5 to 10 knots, becoming east 10 to 15 knots with gusts up to 20 knots in the afternoon. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and east 2 feet at 8 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...Southeast winds 5 to 10 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 11 seconds and east 3 feet at 8 seconds. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Scattered showers. .WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 5 feet. .THURSDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 4 to 5 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 4 to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ716-180130- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 818 AM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF TODAY...South winds 20 to 25 knots with gusts up to 35 knots. Seas 5 to 7 feet. Wave Detail: Northeast 7 feet at 10 seconds and south 6 feet at 5 seconds. Showers and scattered thunderstorms early this morning, then numerous showers with isolated thunderstorms this afternoon. .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet. Wave Detail: Northwest 5 feet at 9 seconds and south 4 feet at 5 seconds. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 4 feet, building to 4 to 6 feet in the afternoon. Wave Detail: Northwest 4 feet at 9 seconds and south 3 feet at 4 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .MONDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and south 3 feet at 4 seconds. Scattered showers. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Northwest 3 feet at 10 seconds and southeast 2 feet at 3 seconds. Scattered showers. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Northwest 3 feet at 10 seconds and east 2 feet at 7 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 5 feet. Scattered showers in the morning. .THURSDAY NIGHT...Northeast winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ723-180130- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 818 AM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF TODAY...South winds 20 to 25 knots, diminishing to 15 to 20 knots this afternoon. Gusts up to 35 knots. Seas 6 to 7 feet. Wave Detail: South 7 feet at 6 seconds and northeast 3 feet at 10 seconds. Isolated thunderstorms. .TONIGHT...South winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet. Wave Detail: South 5 feet at 6 seconds and east 2 feet at 9 seconds. Numerous showers, mainly in the evening. .MONDAY...Southeast winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 4 to 5 feet. Wave Detail: Southeast 4 feet at 7 seconds. Scattered showers. .MONDAY NIGHT...Southeast winds 5 to 10 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds and northwest 1 foot at 9 seconds. Scattered showers in the evening. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: Southeast 3 feet at 7 seconds and northwest 1 foot at 9 seconds. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds and northwest 1 foot at 9 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. .WEDNESDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet. .THURSDAY...East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet. .THURSDAY NIGHT...Northeast winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ726-180130- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 818 AM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF TODAY...South winds 20 to 25 knots with gusts up to 35 knots. Seas 5 to 7 feet. Wave Detail: Southwest 7 feet at 6 seconds and east 3 feet at 11 seconds. Showers and scattered thunderstorms early this morning, then numerous showers with isolated thunderstorms this afternoon. .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet. Wave Detail: Southeast 6 feet at 6 seconds and northeast 2 feet at 10 seconds. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet. Wave Detail: South 4 feet at 5 seconds and east 2 feet at 8 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .MONDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 3 feet at 7 seconds. Scattered showers. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 2 feet at 7 seconds and northwest 2 feet at 9 seconds. Scattered showers. .TUESDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 20 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 5 seconds and east 2 feet at 8 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 4 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. Scattered showers. .THURSDAY NIGHT...Northeast winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 4 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ733-180130- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 818 AM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF TODAY...Southwest winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet. Wave Detail: Southwest 5 feet at 5 seconds and east 4 feet at 12 seconds. Isolated thunderstorms. Numerous showers early this morning, then scattered showers late. .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet. Wave Detail: South 5 feet at 5 seconds and northeast 3 feet at 11 seconds. Scattered showers in the evening, then numerous showers after midnight. .MONDAY...South winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 4 to 5 feet. Wave Detail: South 4 feet at 5 seconds and northeast 2 feet at 10 seconds. Scattered showers. .MONDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds and northwest 1 foot at 9 seconds. Scattered showers. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 7 seconds and northwest 1 foot at 10 seconds. Scattered showers in the morning. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 5 seconds and east 2 feet at 8 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. .THURSDAY NIGHT...Northeast winds 15 to 20 knots with gusts up to 25 knots. Seas around 4 feet. Winds and seas higher in and near thunderstorms. $$ AMZ735-180130- Coastal Waters of Southern Puerto Rico out 10 NM- 818 AM AST Sun Aug 17 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .REST OF TODAY...Southwest winds 10 to 15 knots, increasing to 15 to 20 knots this afternoon. Gusts up to 30 knots. Seas 4 to 6 feet. Wave Detail: Southwest 4 feet at 5 seconds and east 2 feet at 10 seconds. Showers and scattered thunderstorms early this morning, then numerous showers with isolated thunderstorms late. .TONIGHT...South winds 10 to 15 knots with gusts up to 25 knots. Seas around 5 feet. Wave Detail: South 4 feet at 5 seconds and east 2 feet at 10 seconds. .MONDAY...South winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. Wave Detail: South 4 feet at 6 seconds and east 1 foot at 10 seconds. Showers. .MONDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 6 seconds. Scattered showers. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: Southeast 3 feet at 6 seconds. Scattered showers. .TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. .WEDNESDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 20 knots after midnight. Seas 2 to 3 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. .THURSDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Winds and seas higher in and near thunderstorms. $$ AMZ741-180130- Mona Passage Southward to 17N- 818 AM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF TODAY...Southwest winds 15 to 20 knots, increasing to 20 to 25 knots this afternoon. Seas 6 to 9 feet. Wave Detail: Southwest 4 feet at 5 seconds and northeast 2 feet at 7 seconds. Isolated thunderstorms. .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 8 feet. Wave Detail: Northeast 6 feet at 11 seconds and southwest 4 feet at 5 seconds. Scattered showers. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas around 5 feet, building to 6 to 7 feet in the afternoon. Wave Detail: North 5 feet at 10 seconds and south 4 feet at 5 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .MONDAY NIGHT...South winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 6 feet. Wave Detail: South 4 feet at 5 seconds and north 4 feet at 10 seconds. Scattered showers. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds and north 4 feet at 11 seconds. Scattered showers. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. Wave Detail: Southeast 3 feet at 6 seconds and north 3 feet at 11 seconds. .WEDNESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. .THURSDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 4 to 5 feet. Winds and seas higher in and near thunderstorms. $$ AMZ742-180130- Coastal Waters of Northwestern Puerto Rico out 10 NM- 818 AM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF TODAY...Southwest winds 15 to 20 knots, increasing to 20 to 25 knots this afternoon. Seas 7 to 10 feet. Wave Detail: Northeast 6 feet at 14 seconds and southwest 5 feet at 5 seconds. Isolated thunderstorms. Numerous showers early this morning, then scattered showers late this morning and afternoon. .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 7 to 8 feet. Wave Detail: Northeast 8 feet at 13 seconds and southwest 5 feet at 6 seconds. Scattered showers. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 7 feet. Wave Detail: North 6 feet at 10 seconds and southwest 4 feet at 5 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .MONDAY NIGHT...South winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 6 feet. Wave Detail: Northwest 5 feet at 10 seconds and south 4 feet at 5 seconds. Scattered showers. .TUESDAY...South winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and south 3 feet at 5 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots after midnight. Seas 3 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and south 3 feet at 5 seconds. .WEDNESDAY...East winds 5 to 10 knots. Seas 3 to 4 feet. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet. .THURSDAY...East winds 5 to 10 knots, becoming northeast 10 to 15 knots with gusts up to 20 knots in the afternoon. Seas 2 to 4 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. Winds and seas higher in and near thunderstorms. $$ AMZ745-180130- Coastal Waters of Southwestern Puerto Rico out 10 NM- 818 AM AST Sun Aug 17 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .REST OF TODAY...Southwest winds 10 to 15 knots with gusts up to 20 knots, increasing to 15 to 20 knots with gusts up to 30 knots this afternoon. Seas around 6 feet. Wave Detail: Southwest 5 feet at 6 seconds. Numerous showers with isolated thunderstorms. .TONIGHT...South winds 15 to 20 knots with gusts up to 25 knots. Seas 6 to 7 feet. Wave Detail: Southwest 5 feet at 6 seconds and northwest 4 feet at 9 seconds. Numerous showers, mainly in the evening. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave Detail: Northwest 5 feet at 10 seconds and south 4 feet at 5 seconds. Scattered showers early in the morning, then showers in the late morning and afternoon. .MONDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 6 feet. Wave Detail: South 4 feet at 5 seconds and northwest 4 feet at 10 seconds. Scattered showers. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and south 3 feet at 5 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: South 3 feet at 5 seconds and northwest 3 feet at 10 seconds. .WEDNESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots, diminishing to around 5 knots after midnight. Seas 3 to 4 feet. .THURSDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Winds and seas higher in and near thunderstorms. $$