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343 

FZCA52 TJSJ 040741

CWFSJU



Coastal Waters Forecast

National Weather Service San Juan PR

341 AM AST Mon Jan 4 2021



Puerto Rico and the U.S. Virgin Islands Waters



Seas are provided as a range of the average height of the

highest 1/3 of the Seas...Along with the occasional height

of the average highest 10 percent of the Seas.



AMZ700-042030-

341 AM AST Mon Jan 4 2021



.SYNOPSIS FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS WATERS...

A fading northeasterly swell and gradually diminishing wind driven 

seas will maintain choppy and hazardous marine conditions through at

least this afternoon. Moderate east northeast tradewinds will continue

across the local waters. Seas will continue to improve during the

afternoon and onward. Another small northeasterly swell is forecast 

to move across the local Atlantic Waters and Caribbean Passages 

around late Tuesday night and early Wednesday morning.



$$



AMZ710-042030-

Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-

341 AM AST Mon Jan 4 2021



...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 PM AST THIS AFTERNOON...



.TODAY...Northeast winds 10 to 15 knots. Seas diminishing 5 to 7 

feet with occasional seas up to 9 feet. Dominant period 10 seconds. 

Northeast swell 4 to 7 Feet. Isolated showers.

.TONIGHT...Northeast winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds.

Scattered showers.

.TUESDAY...East winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 8 seconds. Scattered

showers.

.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 12 seconds.

Northeast swell around 4 feet. Scattered showers.

.WEDNESDAY...East winds 5 to 10 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 13 seconds. North

swell around 4 feet. Scattered showers.

.THURSDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 11 seconds. North

swell 4 to 5 feet. Scattered showers.

.FRIDAY...East winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds. North

swell 4 to 5 feet. Isolated showers.



$$



AMZ712-042030-

Coastal Waters of Northern Puerto Rico out 10 NM-

341 AM AST Mon Jan 4 2021



...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 PM AST THIS AFTERNOON...



.TODAY...Northeast winds 10 to 15 knots. Seas diminishing 5 to 7 

feet with occasional seas up to 9 feet. Dominant period 10 seconds. 

Northeast swell 4 to 7 Feet. Scattered showers.

.TONIGHT...Northeast winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds. Numerous

showers.

.TUESDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 9 seconds. Scattered

showers.

.TUESDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 4 feet

with occasional seas up to 5 feet. Dominant period 12 seconds.

Scattered showers.

.WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 13 seconds. North

swell around 4 feet. Isolated showers.

.THURSDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 12 seconds. North

swell 4 to 5 feet. Scattered showers.

.FRIDAY...Southeast winds 5 to 10 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds. North

swell 4 to 5 feet. Isolated showers.



$$



AMZ715-042030-

Coastal Waters of Northern USVI and Culebra out 10 NM-

341 AM AST Mon Jan 4 2021



...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 PM AST THIS AFTERNOON...



.TODAY...Northeast winds 10 to 15 knots. Seas diminishing 5 to 7 

feet with occasional seas up to 9 feet. Dominant period 10 seconds. 

Northeast swell 4 to 7 Feet. Scattered showers.

.TONIGHT...East winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds. Numerous

showers.

.TUESDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 8 seconds. Scattered

showers.

.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 12 seconds. Numerous

showers.

.WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 13 seconds. North

swell around 4 feet. Scattered showers.

.THURSDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 11 seconds. North

swell around 4 feet. Numerous showers.

.FRIDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 10 seconds. North

swell 4 to 5 feet. Scattered showers.



$$



AMZ722-042030-

Anegada Passage Southward to 17N-

341 AM AST Mon Jan 4 2021



...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 PM AST THIS AFTERNOON...



.TODAY...Northeast winds 10 to 15 knots. Seas diminishing 5 to 7 

feet with occasional seas up to 9 feet. Dominant period 10 seconds. 

Northeast swell 4 to 6 Feet. Scattered showers.

.TONIGHT...East winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds.

Scattered showers.

.TUESDAY...East winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 8 seconds. Scattered

showers.

.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 12 seconds.

Northeast swell around 4 feet. Scattered showers.

.WEDNESDAY...East winds 10 to 15 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 13 seconds. North

swell around 4 feet. Scattered showers.

.THURSDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 11 seconds. North

swell around 4 feet. Scattered showers.

.FRIDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 11 seconds. North

swell 4 to 5 feet. Scattered showers.



$$



AMZ725-042030-

Coastal Waters of Southern USVI Vieques and Eastern Puerto Rico out

10 NM-

341 AM AST Mon Jan 4 2021



...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM AST THIS MORNING...

...SMALL CRAFT SHOULD EXERCISE CAUTION AFTER 8 AM THIS MORNING...



.TODAY...Northeast winds 10 to 15 knots. Seas diminishing 5 to 7 

feet with occasional seas up to 9 feet. Dominant period 10 seconds. 

East swell 4 to 5 feet. Scattered showers.

.TONIGHT...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 10 seconds. Numerous

showers.

.TUESDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 10 seconds.

Scattered showers.

.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 10 seconds. Numerous

showers.

.WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 12 seconds.

Scattered showers.

.THURSDAY...East winds 10 to 15 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 11 seconds.

Northeast swell around 4 feet. Numerous showers.

.FRIDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 10 seconds.

Northeast swell around 4 feet. Scattered showers.



$$



AMZ732-042030-

Caribbean Waters of Puerto Rico from 10 NM to 17N-

341 AM AST Mon Jan 4 2021



...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 PM AST THIS AFTERNOON...



.TODAY...Northeast winds 10 to 15 knots. Seas diminishing 6 to 8 

feet with occasional seas up to 10 feet. Dominant period 10 seconds. 

East swell 4 to 7 feet. Scattered showers.

.TONIGHT...East winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds.

Scattered showers.

.TUESDAY...East winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds.

Scattered showers.

.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 11 seconds.

Scattered showers.

.WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 12 seconds. East

swell around 4 feet. Scattered showers.

.THURSDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 11 seconds.

Northeast swell around 4 feet. Scattered showers.

.FRIDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 10 seconds. North

swell around 4 feet. Isolated showers.



$$



AMZ735-042030-

Coastal Waters of Southern Puerto Rico out 10 NM-

341 AM AST Mon Jan 4 2021



.TODAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 7 seconds. Isolated

showers.

.TONIGHT...Northeast winds 10 to 15 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 7 seconds. Isolated

showers through the night.

.TUESDAY...East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant

period 7 seconds. Isolated showers.

.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 1 to 3 feet.

Dominant period 7 seconds. Isolated showers.

.WEDNESDAY...Northeast winds 5 to 10 knots. Seas 2 feet or less.

Dominant period 10 seconds. Isolated showers.

.THURSDAY...East winds 5 to 10 knots. Seas 2 feet or less.

Dominant period 11 seconds. Isolated showers.

.FRIDAY...East winds 10 to 15 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 10 seconds. Isolated

showers.



$$



AMZ741-042030-

Mona Passage Southward to 17N-

341 AM AST Mon Jan 4 2021



...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 PM AST THIS AFTERNOON...



.TODAY...Northeast winds 10 to 15 knots. Seas diminishing 5 to 7 

feet with occasional seas up to 9 feet. Dominant period 11 seconds. 

East swell 4 to 7 feet. Isolated showers.

.TONIGHT...Northeast winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds. East

swell 4 to 5 feet. Isolated showers through the night.

.TUESDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 10 seconds. Isolated

showers.

.TUESDAY NIGHT...Northeast winds 5 to 10 knots. Seas 2 to 4 feet

with occasional seas up to 5 feet. Dominant period 8 seconds.

Isolated showers.

.WEDNESDAY...Northeast winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 12 seconds.

Northeast swell around 4 feet. Isolated showers.

.THURSDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 11 seconds. North

swell around 4 feet. Isolated showers.

.FRIDAY...East winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 11 seconds. North

swell around 4 feet. Isolated showers.



$$



AMZ742-042030-

Coastal Waters of Northwestern Puerto Rico out 10 NM-

341 AM AST Mon Jan 4 2021



...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 PM AST THIS AFTERNOON...



.TODAY...Northeast winds 10 to 15 knots. Seas diminishing 5 to 7 

feet with occasional seas up to 9 feet. Dominant period 11 seconds. 

Northeast swell 4 to 7 feet. Isolated showers.

.TONIGHT...Northeast winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 10 seconds.

Northeast swell 4 to 5 feet in the evening. Isolated showers

through the night.

.TUESDAY...Northeast winds 10 to 15 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 10 seconds. Isolated

showers.

.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 8 seconds. Isolated

showers.

.WEDNESDAY...Northeast winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 12 seconds. Isolated

showers.

.THURSDAY...East winds 10 to 15 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 11 seconds. North

swell around 4 feet. Isolated showers.

.FRIDAY...Southeast winds 5 to 10 knots. Seas 3 to 5 feet with

occasional seas up to 6 feet. Dominant period 10 seconds. North

swell 4 to 5 feet. Isolated showers.



$$



AMZ745-042030-

Coastal Waters of Southwestern Puerto Rico out 10 NM-

341 AM AST Mon Jan 4 2021



.TODAY...Northeast winds 10 to 15 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 11 seconds.

.TONIGHT...Northeast winds 10 to 15 knots. Seas 1 to 3 feet.

Dominant period 10 seconds. Isolated showers.

.TUESDAY...East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant

period 7 seconds. Isolated showers.

.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 feet or less.

Dominant period 8 seconds. Isolated showers.

.WEDNESDAY...Northeast winds 5 to 10 knots. Seas 2 feet or less.

Dominant period 12 seconds. Isolated showers.

.THURSDAY...East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant

period 12 seconds. Isolated showers.

.FRIDAY...East winds 5 to 10 knots. Seas 2 to 4 feet with

occasional seas up to 5 feet. Dominant period 10 seconds. Isolated

showers.



$$

