

824 

FZCA52 TJSJ 201602

CWFSJU



Coastal Waters Forecast

National Weather Service San Juan PR

1202 PM AST Thu Aug 20 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.



AMZ700-210430-

1202 PM AST Thu Aug 20 2020



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

Relatively tranquil marine conditions continue into tonight. 

Building seas are anticipated by overnight tonight in the offshore 

Atlantic waters associated with the approach of Tropical Depression 

Thirteen. This system is expected to intensify into a Tropical Storm 

in the near future, and Tropical Storm conditions are expected to 

impact the local Atlantic waters. Hazardous seas will spread across 

much of the local waters, as well. Increasing shower activity is 

expected this afternoon as a trough makes its way through the area. 

Widespread showers are expected for the weekend as the tropical 

cyclone passes by to the north of the local islands.



$$



AMZ710-210430-

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

1202 PM AST Thu Aug 20 2020



...TROPICAL STORM WATCH IN EFFECT FOR FRIDAY NIGHT INTO SATURDAY

NIGHT...



.REST OF TODAY...East winds 10 to 15 knots with gusts to around 25

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 8 seconds. Scattered showers through the day.

Isolated thunderstorms in the afternoon.

.TONIGHT...East winds 10 to 15 knots with gusts to around 25

knots. Seas 4 to 6 feet with occasional seas up to 8 feet.

Dominant period 8 seconds. Scattered showers and isolated

thunderstorms.

.FRIDAY...East winds 10 to 15 knots with gusts to around 25 knots.

Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant

period 8 seconds. Isolated thunderstorms in the morning. Scattered

showers through the day.

.FRIDAY NIGHT... Tropical storm conditions possible. Northeast

winds 20 to 25 knots with gusts to around 35 knots. Seas 8 to 10

feet with occasional seas up to 13 feet. Dominant period 8

seconds. North swell 4 to 5 feet after midnight. Numerous showers

and isolated thunderstorms.

.SATURDAY... Tropical storm conditions possible. Northeast winds

30 to 35 knots veering south 25 to 30 knots in the afternoon.

Gusts up to 50 knots. Seas 13 to 15 feet with occasional seas up

to 19 feet. Dominant period 11 seconds. Northeast swell 5 to 10

feet. Numerous showers and isolated thunderstorms.

.SATURDAY NIGHT... Tropical storm conditions possible. Southeast

winds around 30 knots with gusts to around 45 knots. Seas 13 to 15

feet with occasional seas up to 19 feet. Dominant period 11

seconds. Northeast swell 5 to 10 feet. Numerous showers and

isolated thunderstorms.

.SUNDAY...Southeast winds 20 to 25 knots. Gusts up to 40 knots

decreasing to 30 knots in the afternoon. Seas 10 to 12 feet with

occasional seas up to 15 feet. Dominant period 10 seconds.

Northeast swell 4 to 8 feet. Scattered showers and isolated

thunderstorms.

.SUNDAY NIGHT...East winds 15 to 20 knots with gusts to around 30

knots. Seas 4 to 6 feet with occasional seas up to 8 feet.

Dominant period 10 seconds. Isolated showers.

.MONDAY...East winds 15 to 20 knots with gusts to around 30 knots.

Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant

period 10 seconds. Isolated showers.



$$



AMZ712-210430-

Coastal Waters of Northern Puerto Rico out 10 NM-

1202 PM AST Thu Aug 20 2020



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

SATURDAY EVENING...



.REST OF TODAY...East winds 10 to 15 knots with gusts to around 25

knots. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 7 seconds.

.TONIGHT...East winds 10 to 15 knots. Gusts up to 25 knots in the

evening. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 7 seconds. Numerous showers and isolated

thunderstorms.

.FRIDAY...East winds 10 to 15 knots. Gusts up to 25 knots in the

afternoon. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 8 seconds. Scattered showers and isolated

thunderstorms.

.FRIDAY NIGHT...East winds 10 to 15 knots with gusts to around 25

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 8 seconds. Numerous showers and isolated

thunderstorms.

.SATURDAY...Northeast winds 10 to 15 knots with gusts to around 25

knots backing northwest in the afternoon. Seas 8 to 10 feet with

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

Northeast swell 4 to 8 feet in the afternoon. Numerous showers and

isolated thunderstorms.

.SATURDAY NIGHT...Southeast winds 20 to 25 knots with gusts to

around 35 knots. Seas 8 to 10 feet with occasional seas up to 11

feet. Dominant period 11 seconds. Northeast swell 4 to 9 feet.

Numerous showers and isolated thunderstorms.

.SUNDAY...Southeast winds 15 to 20 knots with gusts to around 30

knots. Seas 6 to 8 feet with occasional seas up to 10 feet.

Dominant period 10 seconds. North swell up to 4 feet. Scattered

showers and isolated thunderstorms.

.SUNDAY NIGHT...East winds 10 to 15 knots. Gusts up to 25 knots

after midnight. Seas 2 to 4 feet with occasional seas up to 5

feet. Dominant period 10 seconds. Isolated showers.

.MONDAY...East winds 10 to 15 knots with gusts to around 25 knots.

Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant

period 10 seconds. Scattered showers.



$$



AMZ715-210430-

Coastal Waters of Northern USVI and Culebra out 10 NM-

1202 PM AST Thu Aug 20 2020



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

SATURDAY EVENING...



.REST OF TODAY...East winds 10 to 15 knots with gusts to around 25

knots. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 8 seconds. Scattered showers through the day.

Isolated thunderstorms in the afternoon.

.TONIGHT...East winds 10 to 15 knots with gusts to around 25

knots. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 8 seconds. Scattered showers and isolated

thunderstorms.

.FRIDAY...East winds 10 to 15 knots with gusts to around 25 knots.

Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant

period 8 seconds. Scattered showers and isolated thunderstorms.

.FRIDAY NIGHT... Tropical storm conditions possible. Northeast

winds 20 to 25 knots with gusts to around 35 knots. Seas 3 to 5

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

Numerous showers and isolated thunderstorms.

.SATURDAY...North winds 20 to 25 knots backing south with gusts to

around 40 knots in the afternoon. Seas 5 to 7 feet with occasional

seas up to 9 feet. Dominant period 11 seconds. Northeast swell 4

to 6 Feet. Numerous showers and isolated thunderstorms.

.SATURDAY NIGHT...Southeast winds around 30 knots with gusts to

around 45 knots. Seas 5 to 7 feet with occasional seas up to 9

feet. Dominant period 10 seconds. Northeast swell 4 to 6 feet.

Numerous showers and isolated thunderstorms.

.SUNDAY...East winds 15 to 20 knots with gusts to around 30 knots.

Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant

period 8 seconds. Northeast swell around 4 Feet. Isolated showers.

.SUNDAY NIGHT...East winds 10 to 15 knots with gusts to around 25

knots. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 8 seconds. Isolated showers.

.MONDAY...Northeast winds 10 to 15 knots with gusts to around 25

knots. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 8 seconds. Scattered showers.



$$



AMZ722-210430-

Anegada Passage Southward to 17N-

1202 PM AST Thu Aug 20 2020



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

SATURDAY EVENING...



.REST OF TODAY...Northeast winds 10 to 15 knots with gusts to

around 25 knots. Seas 3 to 5 feet with occasional seas up to 6

feet. Dominant period 8 seconds. Numerous showers through the day.

Isolated thunderstorms in the afternoon.

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

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

showers and isolated thunderstorms.

.FRIDAY...East winds 10 to 15 knots with gusts to around 25 knots.

Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant

period 8 seconds. Scattered showers through the day. Isolated

thunderstorms in the afternoon.

.FRIDAY NIGHT... Tropical storm conditions possible. Northeast

winds 15 to 20 knots with gusts to around 35 knots. Seas 8 to 10

feet with occasional seas up to 11 feet. Dominant period 10

seconds. East swell around 4 feet after midnight. Numerous showers

and isolated thunderstorms.

.SATURDAY...South winds 20 to 25 knots. Gusts up to 30 knots

increasing to 40 knots in the afternoon. Seas 10 to 12 feet with

occasional seas up to 15 feet. Dominant period 11 seconds.

Northeast swell 4 to 9 feet. Numerous showers and isolated

thunderstorms.

.SATURDAY NIGHT...Southeast winds around 30 knots with gusts to

around 40 knots. Seas 8 to 10 feet with occasional seas up to 13

feet. Dominant period 8 seconds. Northeast swell 4 to 9 feet.

Numerous showers and isolated thunderstorms.

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

occasional seas up to 10 feet. Dominant period 7 seconds. East

swell around 4 Feet. Isolated showers.

.SUNDAY NIGHT...East winds 10 to 15 knots with gusts to around 25

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 6 seconds. Isolated showers.

.MONDAY...Northeast winds 10 to 15 knots with gusts to around 25

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 7 seconds. Scattered showers.



$$



AMZ725-210430-

Coastal Waters of Southern USVI Vieques and Eastern Puerto Rico out

10 NM-

1202 PM AST Thu Aug 20 2020



...SMALL CRAFT ADVISORY IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING...



.REST OF TODAY...Northeast winds 10 to 15 knots with gusts to

around 25 knots. Seas 2 to 4 feet with occasional seas up to 5

feet. Dominant period 8 seconds. Scattered showers through the

day. Isolated thunderstorms in the afternoon.

.TONIGHT...East winds 10 to 15 knots with gusts to around 25

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 7 seconds. Numerous showers and isolated

thunderstorms.

.FRIDAY...East winds 10 to 15 knots. Gusts up to 25 knots in the

afternoon. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 8 seconds. Scattered showers and isolated

thunderstorms.

.FRIDAY NIGHT... Tropical storm conditions possible. Northeast

winds 15 to 20 knots with gusts to around 30 knots. Seas 4 to 6

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

seconds. Numerous showers and isolated thunderstorms.

.SATURDAY...North winds 20 to 25 knots with gusts to around 25

knots becoming south with gusts to around 35 knots in the

afternoon. Seas 6 to 8 feet with occasional seas up to 10 feet.

Dominant period 11 seconds. East swell 4 to 6 feet. Numerous

showers and isolated thunderstorms.

.SATURDAY NIGHT...Southeast winds around 30 knots with gusts to

around 40 knots. Seas 8 to 10 feet with occasional seas up to 11

feet. Dominant period 10 seconds. Northeast swell 4 to 6 feet.

Numerous showers and isolated thunderstorms.

.SUNDAY...East winds 15 to 20 knots with gusts to around 30 knots.

Seas 8 to 10 feet with occasional seas up to 11 feet. Dominant

period 7 seconds. Northeast swell around 4 Feet. Isolated

thunderstorms in the morning. Scattered showers through the day.

.SUNDAY NIGHT...East winds 10 to 15 knots with gusts to around 25

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 7 seconds. Isolated showers.

.MONDAY...Northeast winds 10 to 15 knots with gusts to around 25

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 8 seconds. Scattered showers.



$$



AMZ732-210430-

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

1202 PM AST Thu Aug 20 2020



...SMALL CRAFT ADVISORY IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING...



.REST OF TODAY...East winds 10 to 15 knots with gusts to around 25

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 7 seconds. Numerous showers through the day.

Isolated thunderstorms in the afternoon.

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

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

showers and isolated thunderstorms.

.FRIDAY...East winds 10 to 15 knots with gusts to around 25 knots.

Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant

period 8 seconds. Scattered showers through the day. Isolated

thunderstorms in the afternoon.

.FRIDAY NIGHT... Tropical storm conditions possible. Northeast

winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to

6 feet. Dominant period 10 seconds. Numerous showers and isolated

thunderstorms.

.SATURDAY...Northeast winds 15 to 20 knots veering south in the

afternoon. Gusts up to 25 knots increasing to 30 knots in the

afternoon. Seas 5 to 7 feet with occasional seas up to 9 feet.

Dominant period 11 seconds. East swell 4 to 6 feet. Numerous

showers and isolated thunderstorms.

.SATURDAY NIGHT...Southeast winds 20 to 25 knots with gusts to

around 40 knots. Seas 6 to 8 feet with occasional seas up to 10

feet. Dominant period 11 seconds. Northeast swell 4 to 6 feet.

Numerous showers and isolated thunderstorms.

.SUNDAY...East winds 15 to 20 knots with gusts to around 30 knots.

Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant

period 10 seconds. North swell up to 4 feet. Scattered showers and

isolated thunderstorms.

.SUNDAY NIGHT...East winds 15 to 20 knots with gusts to around 30

knots. Seas 4 to 6 feet with occasional seas up to 8 feet.

Dominant period 7 seconds. Isolated showers.

.MONDAY...East winds 15 to 20 knots with gusts to around 30 knots.

Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant

period 10 seconds. Isolated showers.



$$



AMZ735-210430-

Coastal Waters of Southern Puerto Rico out 10 NM-

1202 PM AST Thu Aug 20 2020



.REST OF TODAY...East winds 10 to 15 knots. Gusts up to 25 knots

in the afternoon. Seas 3 to 5 feet with occasional seas up to 6

feet. Dominant period 7 seconds.

.TONIGHT...Northeast winds 10 to 15 knots. Gusts up to 25 knots in

the evening. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 7 seconds. Scattered showers and isolated

thunderstorms.

.FRIDAY...East winds 10 to 15 knots. Gusts up to 25 knots in the

afternoon. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 8 seconds. Isolated showers in the morning, then

isolated thunderstorms in the afternoon.

.FRIDAY NIGHT...Northeast winds 10 to 15 knots. Gusts up to 25

knots in the evening. Seas 1 to 3 feet. Dominant period 7 seconds.

Scattered showers and isolated thunderstorms.

.SATURDAY...North winds 5 to 10 knots backing south in the

afternoon. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 11 seconds. East swell around 4 feet in the

afternoon. Numerous showers and isolated thunderstorms.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots. Gusts up to 35

knots. Seas 4 to 6 feet with occasional seas up to 8 feet.

Dominant period 11 seconds. East swell around 4 feet. Numerous

showers and isolated thunderstorms.

.SUNDAY...East winds 20 to 25 knots with gusts to around 35 knots.

Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant

period 7 seconds. Scattered showers and isolated thunderstorms.

.SUNDAY NIGHT...East winds 10 to 15 knots. Gusts up to 25 knots

after midnight. Seas 3 to 5 feet with occasional seas up to 6

feet. Dominant period 7 seconds. Isolated showers.

.MONDAY...East winds 10 to 15 knots. Gusts up to 25 knots in the

morning. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 7 seconds. Isolated showers.



$$



AMZ741-210430-

Mona Passage Southward to 17N-

1202 PM AST Thu Aug 20 2020



...SMALL CRAFT SHOULD EXERCISE CAUTION...



.REST OF TODAY...East winds 10 to 15 knots. Seas 4 to 6 feet with

occasional seas up to 8 feet. Dominant period 7 seconds.

.TONIGHT...Northeast winds 10 to 15 knots with gusts to around 25

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 7 seconds. Scattered showers through the night.

Isolated thunderstorms after midnight.

.FRIDAY...East winds 10 to 15 knots with gusts to around 25 knots.

Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant

period 8 seconds. Scattered showers through the day. Isolated

thunderstorms in the afternoon.

.FRIDAY NIGHT...Northeast winds 15 to 20 knots. Seas 2 to 4 feet

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

Isolated thunderstorms in the evening. Scattered showers through

the night.

.SATURDAY...North winds 10 to 15 knots. Gusts up to 25 knots in

the morning. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 10 seconds. Numerous showers through the day.

Isolated thunderstorms in the afternoon.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots with gusts to

around 30 knots. Seas 3 to 5 feet with occasional seas up to 6

feet. Dominant period 11 seconds. Northeast swell up to 4 feet.

Scattered showers and isolated thunderstorms.

.SUNDAY...Southeast winds 20 to 25 knots with gusts to around 35

knots. Seas 4 to 6 feet with occasional seas up to 8 feet.

Dominant period 10 seconds. Northeast swell up to 4 feet in the

morning becoming light. Numerous showers and isolated

thunderstorms.

.SUNDAY NIGHT...East winds 15 to 20 knots with gusts to around 30

knots. Seas 5 to 7 feet with occasional seas up to 9 feet.

Dominant period 8 seconds. Scattered showers.

.MONDAY...East winds 15 to 20 knots with gusts to around 30 knots.

Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant

period 8 seconds. Isolated showers.



$$



AMZ742-210430-

Coastal Waters of Northwestern Puerto Rico out 10 NM-

1202 PM AST Thu Aug 20 2020



.REST OF TODAY...East winds 10 to 15 knots. Seas 1 to 3 feet.

Dominant period 8 seconds. Isolated thunderstorms in the

afternoon.

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

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

thunderstorms in the evening. Scattered showers through the night.

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

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

showers and isolated thunderstorms.

.FRIDAY NIGHT...Northeast winds 10 to 15 knots with gusts to

around 25 knots. Seas 1 to 3 feet. Dominant period 8 seconds.

Scattered showers through the night. Isolated thunderstorms after

midnight.

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

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

showers and isolated thunderstorms.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots with gusts to

around 30 knots. Seas 4 to 6 feet with occasional seas up to 8

feet. Dominant period 11 seconds. Northeast swell 4 to 5 feet.

Numerous showers and isolated thunderstorms.

.SUNDAY...Southeast winds 20 to 25 knots with gusts to around 35

knots easing to southeast 20 to 25 knots with gusts to around 25

knots in the afternoon. Seas 4 to 6 feet with occasional seas up

to 8 feet. Dominant period 10 seconds. Numerous showers and

isolated thunderstorms.

.SUNDAY NIGHT...East winds 10 to 15 knots. Gusts up to 25 knots

after midnight. Seas 1 to 3 feet. Dominant period 7 seconds.

Isolated showers.

.MONDAY...East winds 10 to 15 knots. Gusts up to 25 knots in the

morning. Seas 2 to 4 feet with occasional seas up to 5 feet.

Dominant period 7 seconds. Isolated showers.



$$



AMZ745-210430-

Coastal Waters of Southwestern Puerto Rico out 10 NM-

1202 PM AST Thu Aug 20 2020



.REST OF TODAY...Southeast winds 5 to 10 knots. Seas 1 to 3 feet.

Dominant period 7 seconds.

.TONIGHT...Northeast winds 5 to 10 knots. Seas 1 to 3 feet.

Dominant period 7 seconds. Scattered showers.

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

period 7 seconds. Scattered showers through the day. Isolated

thunderstorms in the afternoon.

.FRIDAY NIGHT...Northeast winds 5 to 10 knots. Seas 2 feet or

less. Dominant period 7 seconds. Isolated showers.

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

Dominant period 7 seconds. Numerous showers through the day.

Isolated thunderstorms in the afternoon.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots with gusts to

around 30 knots. Seas 2 to 4 feet with occasional seas up to 5

feet. Dominant period 8 seconds. Numerous showers and isolated

thunderstorms.

.SUNDAY...Southeast winds 20 to 25 knots with gusts to around 35

knots. Seas 3 to 5 feet with occasional seas up to 6 feet.

Dominant period 7 seconds. Numerous showers and isolated

thunderstorms.

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

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

showers.

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

period 7 seconds. Scattered showers through the day. Isolated

thunderstorms in the afternoon.



$$

