

942 

FZCA52 TJSJ 211947

CWFSJU



Coastal Waters Forecast

National Weather Service San Juan PR

347 PM AST Mon Dec 21 2020



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.



AMZ700-220815-

347 PM AST Mon Dec 21 2020



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

A surface-high pressure over the central Atlantic will maintain an

easterly wind flow through Tuesday. A long period northeasterly 

swell will continue to invade the local waters today. This along with

moderate to locally fresh trade winds will create choppy and 

hazardous marine conditions that will extend through much of the 

workweek.



$$



AMZ710-220815-

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

347 PM AST Mon Dec 21 2020



...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON...



.TONIGHT...East winds 10 to 15 knots. Seas 5 to 7 feet with

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

swell 4 to 7 feet. Scattered showers.

.TUESDAY...East winds 10 to 15 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 12 seconds. North

swell 5 to 7 feet. Isolated showers.

.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 6 to 8 feet with

occasional seas up to 10 feet. Dominant period 13 seconds. North

swell 5 to 7 feet. Scattered showers.

.WEDNESDAY...East winds 10 to 15 knots. Seas 6 to 8 feet with

occasional seas up to 10 feet. Dominant period 14 seconds.

Northeast swell 6 to 7 feet. Isolated showers.

.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 8 to 10 feet

with occasional seas up to 11 feet. Dominant period 12 seconds.

Northeast swell 5 to 8 feet. Scattered showers.

.THURSDAY...East winds 15 to 20 knots. Seas 8 to 10 feet with

occasional seas up to 11 feet. Dominant period 12 seconds.

Northeast swell 4 to 8 feet. Isolated showers.

.FRIDAY...East winds 10 to 15 knots. Seas 6 to 8 feet with

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

swell around 4 feet. Isolated showers.

.SATURDAY...East winds 5 to 10 knots. Seas 5 to 7 feet with

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

showers.



$$



AMZ712-220815-

Coastal Waters of Northern Puerto Rico out 10 NM-

347 PM AST Mon Dec 21 2020



...SMALL CRAFT SHOULD EXERCISE CAUTION... 

...SMALL CRAFT ADVISORY IN EFFECT FROM TUESDAY AFTERNOON THROUGH 

LATE THURSDAY NIGHT...



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

occasional seas up to 8 feet. Dominant period 11 seconds.

Northeast swell 4 to 5 feet after midnight. Isolated showers

through the night.

.TUESDAY...East winds 10 to 15 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 12 seconds. North

swell 4 to 6 feet. Isolated showers.

.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 13 seconds. North

swell 5 to 7 feet. Scattered showers.

.WEDNESDAY...East winds 10 to 15 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 14 seconds.

Northeast swell 5 to 7 feet. Isolated showers.

.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 7 feet

with occasional seas up to 9 feet. Dominant period 13 seconds.

Northeast swell 5 to 7 feet. Isolated showers.

.THURSDAY...East winds 15 to 20 knots. Seas 6 to 8 feet with

occasional seas up to 10 feet. Dominant period 12 seconds.

Northeast swell 4 to 7 feet. Isolated showers.

.FRIDAY...East 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. Scattered showers.

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

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

showers.



$$



AMZ715-220815-

Coastal Waters of Northern USVI and Culebra out 10 NM-

347 PM AST Mon Dec 21 2020



...SMALL CRAFT SHOULD EXERCISE CAUTION...

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TUESDAY NIGHT THROUGH 

FRIDAY AFTERNOON...



.TONIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 11 seconds. North

swell 4 to 5 feet after midnight. Scattered showers.

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

occasional seas up to 8 feet. Dominant period 11 seconds. North

swell 4 to 5 feet. Isolated showers.

.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 12 seconds. North

swell 4 to 6 feet. Isolated showers.

.WEDNESDAY...Northeast winds 10 to 15 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 13 seconds. North

swell 4 to 6 feet. Isolated showers.

.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet

with occasional seas up to 9 feet. Dominant period 12 seconds.

North swell 4 to 7 feet. Scattered showers.

.THURSDAY...East winds 15 to 20 knots. Seas 6 to 8 feet with

occasional seas up to 10 feet. Dominant period 12 seconds. North

swell 4 to 7 feet. Scattered showers.

.FRIDAY...East winds 15 to 20 knots. Seas 5 to 7 feet with

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

Northeast swell 4 to 5 feet. Isolated showers.

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

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

showers.



$$



AMZ722-220815-

Anegada Passage Southward to 17N-

347 PM AST Mon Dec 21 2020



...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL 8 PM AST THIS EVENING...

...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM AST THIS EVENING THROUGH

FRIDAY AFTERNOON...



.TONIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet with

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

swell 4 to 7 feet. Scattered showers.

.TUESDAY...East winds 15 to 20 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 12 seconds. North

swell 4 to 7 feet. Isolated showers.

.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 13 seconds. North

swell 5 to 7 feet. Isolated showers.

.WEDNESDAY...Northeast winds 10 to 15 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 14 seconds. North

swell 5 to 7 feet. Isolated showers.

.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 8 to 10 feet

with occasional seas up to 11 feet. Dominant period 13 seconds.

Northeast swell 5 to 8 feet. Scattered showers.

.THURSDAY...East winds 15 to 20 knots. Seas 8 to 10 feet with

occasional seas up to 11 feet. Dominant period 12 seconds.

Northeast swell 4 to 8 feet. Scattered showers.

.FRIDAY...East winds 15 to 20 knots. Seas 6 to 8 feet with

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

Northeast swell around 4 feet. Scattered showers.

.SATURDAY...East winds 5 to 10 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 9 seconds. Isolated

showers.



$$



AMZ725-220815-

Coastal Waters of Southern USVI Vieques and Eastern Puerto Rico out

10 NM-

347 PM AST Mon Dec 21 2020



...SMALL CRAFT SHOULD EXERCISE CAUTION...



.TONIGHT...East winds 15 to 20 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 11 seconds.

Northeast swell around 4 feet. Isolated showers.

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

occasional seas up to 8 feet. Dominant period 11 seconds. East

swell 4 to 5 feet. Isolated showers.

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

occasional seas up to 8 feet. Dominant period 12 seconds. East

swell 4 to 5 feet. Scattered showers.

.WEDNESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 5 to 7

feet with occasional seas up to 9 feet. Dominant period 12

seconds. Northeast swell 4 to 5 feet. Scattered showers.

.THURSDAY...East winds 15 to 20 knots. Seas 5 to 7 feet with

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

Northeast swell 4 to 5 feet. Scattered showers.

.FRIDAY...East winds 15 to 20 knots. Seas 4 to 6 feet with

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

swell around 4 feet. Isolated showers.

.SATURDAY...Northeast winds 5 to 10 knots. Seas 3 to 5 feet with

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

showers.



$$



AMZ732-220815-

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

347 PM AST Mon Dec 21 2020



...SMALL CRAFT SHOULD EXERCISE CAUTION...

...SMALL CRAFT ADVISORY IN EFFECT FROM TUESDAY EVENING THROUGH 

FRIDAY AFTERNOON...



.TONIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet with

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

Scattered showers.

.TUESDAY...East winds 15 to 20 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 11 seconds. North

swell 4 to 5 feet. Isolated showers.

.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 12 seconds.

Northeast swell 4 to 7 feet. Isolated showers.

.WEDNESDAY...Northeast winds 10 to 15 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 12 seconds.

Northeast swell 4 to 7 feet. Isolated showers.

.WEDNESDAY NIGHT...Northeast winds 15 to 20 knots. Seas 6 to 8

feet with occasional seas up to 10 feet. Dominant period 12

seconds. Northeast swell 4 to 7 feet. Scattered showers.

.THURSDAY...East winds 15 to 20 knots. Seas 6 to 8 feet with

occasional seas up to 10 feet. Dominant period 12 seconds.

Northeast swell 4 to 8 feet. Isolated showers.

.FRIDAY...East winds 15 to 20 knots. Seas 5 to 7 feet with

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

swell around 4 feet. Isolated showers.

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

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

showers.



$$



AMZ735-220815-

Coastal Waters of Southern Puerto Rico out 10 NM-

347 PM AST Mon Dec 21 2020



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

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

showers through the night.

.TUESDAY...East winds 15 to 20 knots. Seas 3 to 5 feet with

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

showers through the day.

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

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

showers.

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

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

showers.

.WEDNESDAY NIGHT...Northeast winds 10 to 15 knots. Seas 2 to 4

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

Isolated showers.

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

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

showers.

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

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

showers.

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

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

showers.



$$



AMZ741-220815-

Mona Passage Southward to 17N-

347 PM AST Mon Dec 21 2020



...SMALL CRAFT SHOULD EXERCISE CAUTION...

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TUESDAY NIGHT THROUGH

THURSDAY EVENING...



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

occasional seas up to 8 feet. Dominant period 11 seconds. North

swell 4 to 5 feet after midnight. Isolated showers through the

night.

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

occasional seas up to 8 feet. Dominant period 11 seconds.

Northeast swell 4 to 5 feet. Scattered showers.

.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 12 seconds.

Northeast swell 4 to 6 feet. Scattered showers.

.WEDNESDAY...Northeast winds 15 to 20 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 12 seconds.

Northeast swell 4 to 7 feet. Isolated showers.

.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet

with occasional seas up to 9 feet. Dominant period 12 seconds.

Northeast swell 4 to 7 feet. Isolated showers.

.THURSDAY...East winds 15 to 20 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 12 seconds.

Northeast swell 4 to 6 feet. Isolated showers.

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

occasional seas up to 8 feet. Dominant period 11 seconds. East

swell 4 to 5 feet. Scattered showers.

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

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

showers.



$$



AMZ742-220815-

Coastal Waters of Northwestern Puerto Rico out 10 NM-

347 PM AST Mon Dec 21 2020



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

occasional seas up to 8 feet. Dominant period 11 seconds. North

swell 4 to 5 feet.

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

occasional seas up to 8 feet. Dominant period 12 seconds. North

swell 4 to 5 feet. Isolated showers.

.WEDNESDAY...Northeast winds 10 to 15 knots. Seas 5 to 7 feet with

occasional seas up to 9 feet. Dominant period 13 seconds.

Northeast swell 4 to 6 feet. Scattered showers.

.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 7 feet

with occasional seas up to 9 feet. Dominant period 13 seconds.

Northeast swell 4 to 6 feet. Isolated showers.

.THURSDAY...East winds 15 to 20 knots. Seas 3 to 5 feet with

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

Northeast swell 4 to 6 feet. Scattered showers.

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

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

Northeast swell around 4 feet. Scattered showers.

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

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

Scattered showers.



$$



AMZ745-220815-

Coastal Waters of Southwestern Puerto Rico out 10 NM-

347 PM AST Mon Dec 21 2020



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

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

showers.

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

occasional seas up to 5 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. Isolated

showers.

.WEDNESDAY...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 NIGHT...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 5 to 10 knots. Seas 2 to 4 feet with

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

Scattered showers.

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

period 10 seconds. Scattered showers.

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

period 8 seconds. Scattered showers.



$$

