

917 

FZCA52 TJSJ 210412 RRA

CWFSJU



Coastal Waters Forecast...DELAYED

National Weather Service San Juan PR

1212 AM AST Fri Aug 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.



AMZ700-211715-

1212 AM AST Fri Aug 21 2020



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

Relatively tranquil marine conditions continue tonight. However, 

increasing shower and thunderstorm activity is expected this evening

as a tropical wave makes its way through the area overnight. 

Tropical Depression Thirteen is expected to intensify into a Tropical

Storm Friday evening, and Tropical Storm conditions are likely 

across the local waters by Friday evening through Saturday. Hazardous

seas will spread across much of the local waters, as well. 

Widespread showers and scattered thunderstorms are expected for the 

weekend as the tropical cyclone passes through the outer Atlantic

waters.



$$



AMZ710-211715-

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

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



.REST OF TONIGHT...East winds 10 to 15 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. 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...Northeast winds 10 to 20 knots rising to 25 to 35

knots with gusts to around 55 knots after midnight. Seas 10 to 12

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

seconds. North swell 4 to 6 feet. Numerous showers and isolated

thunderstorms.

.SATURDAY...East winds 25 to 35 knots becoming southeast 15 to 25

knots in the afternoon. Gusts up to 55 knots. Seas 16 to 18 feet

with occasional seas up to 20 feet. Dominant period 11 seconds.

Northeast swell 6 to 11 feet. Numerous showers and isolated

thunderstorms.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots. Seas 13 to 15

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

seconds. Northeast swell 6 to 11 feet. Numerous showers and

isolated thunderstorms.

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

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

Southeast swell 4 to 9 feet. Isolated thunderstorms. Scattered

showers.

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

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

showers. Isolated thunderstorms.

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

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

showers.



$$



AMZ712-211715-

Coastal Waters of Northern Puerto Rico out 10 NM-

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



.REST OF TONIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet with

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

showers and isolated thunderstorms.

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

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

showers and isolated thunderstorms.

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

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

Numerous showers and isolated thunderstorms.

.SATURDAY...East winds 10 to 15 knots veering southeast in the

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

Dominant period 8 seconds. Numerous showers and isolated

thunderstorms.

.SATURDAY NIGHT...Southeast winds 10 to 15 knots. Seas 8 to 10

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

seconds. Northeast swell 4 to 9 feet. Numerous showers and

isolated thunderstorms.

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

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

Northeast swell 4 to 8 feet. Isolated thunderstorms. Scattered

showers.

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

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

showers. Isolated thunderstorms.

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

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

thunderstorms. Scattered showers.



$$



AMZ715-211715-

Coastal Waters of Northern USVI and Culebra out 10 NM-

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

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

Scattered showers and isolated thunderstorms.

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

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

showers and isolated thunderstorms.

.FRIDAY NIGHT...Northeast winds 20 to 25 knots. Gusts up to 55

knots after midnight. Seas 8 to 10 feet with occasional seas up to

11 feet. Dominant period 10 seconds. North swell around 4 feet

after midnight. Numerous showers and isolated thunderstorms.

.SATURDAY...Southeast winds 15 to 20 knots. Seas 10 to 12 feet

with occasional seas up to 14 feet. Dominant period 11 seconds.

Northeast swell 4 to 9 feet. Numerous showers and isolated

thunderstorms.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots. Seas 8 to 10

feet with occasional seas up to 13 feet. Dominant period 10

seconds. Northeast swell 4 to 9 feet. Numerous showers and

isolated thunderstorms.

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

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

showers.

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

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

showers. Isolated thunderstorms.

.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.



$$



AMZ722-211715-

Anegada Passage Southward to 17N-

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



.REST OF TONIGHT...East winds around 10 knots. Seas 3 to 5 feet

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

Scattered showers and isolated thunderstorms.

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

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

showers through the day. Isolated thunderstorms in the afternoon.

.FRIDAY NIGHT...East winds 10 to 15 knots. Seas 10 to 12 feet with

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

swell 4 to 5 feet. Numerous showers and isolated thunderstorms.

.SATURDAY...Southeast winds 15 to 20 knots. Seas 12 to 14 feet

with occasional seas up to 17 feet. Dominant period 11 seconds.

Northeast swell 6 to 11 feet. Numerous showers and isolated

thunderstorms.

.SATURDAY NIGHT...East winds 10 to 15 knots. Seas 10 to 12 feet

with occasional seas up to 14 feet. Dominant period 8 seconds.

Northeast swell 5 to 10 feet subsiding to 4 to 5 feet after

midnight. Numerous showers and isolated thunderstorms.

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

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

showers.

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

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

showers.

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

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

showers.



$$



AMZ725-211715-

Coastal Waters of Southern USVI Vieques and Eastern Puerto Rico out

10 NM-

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

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

Scattered showers and isolated thunderstorms.

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

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

showers and isolated thunderstorms.

.FRIDAY NIGHT...Northeast winds 10 to 15 knots. Seas 6 to 8 feet

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

East swell around 4 feet after midnight. Numerous showers and

isolated thunderstorms.

.SATURDAY...Southeast winds 15 to 20 knots. Seas 10 to 12 feet

with occasional seas up to 14 feet. Dominant period 11 seconds.

East swell 4 to 9 feet. Numerous showers and isolated

thunderstorms.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots. Seas 10 to 12

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

seconds. Northeast swell 4 to 9 feet. Numerous showers and

isolated thunderstorms.

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

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

thunderstorms. Scattered showers.

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

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

showers. Isolated thunderstorms.

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

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

showers.



$$



AMZ732-211715-

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

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

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

Scattered showers and isolated thunderstorms.

.FRIDAY...Northeast winds 10 to 15 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.

.FRIDAY NIGHT...Northeast winds 10 to 15 knots. Seas 4 to 6 feet

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

Numerous showers and isolated thunderstorms.

.SATURDAY...Southeast winds 15 to 20 knots. Seas 8 to 10 feet with

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

swell 4 to 8 feet. Numerous showers and isolated thunderstorms.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots. Seas 8 to 10

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

seconds. Northeast swell 4 to 8 feet. Numerous showers and

isolated thunderstorms.

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

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

swell around 4 feet. Isolated thunderstorms. Scattered showers.

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

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

showers. Isolated thunderstorms.

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

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

showers.



$$



AMZ735-211715-

Coastal Waters of Southern Puerto Rico out 10 NM-

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



.REST OF TONIGHT...Northeast winds 5 to 10 knots. 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. Seas 2 to 4 feet with

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

showers in the morning, then isolated thunderstorms in the

afternoon.

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

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

Scattered showers and isolated thunderstorms.

.SATURDAY...North winds 10 to 15 knots veering southeast in the

afternoon. Seas 1 to 3 feet. Dominant period 7 seconds. Numerous

showers and isolated thunderstorms.

.SATURDAY NIGHT...Southeast 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 after midnight. Numerous showers and

isolated thunderstorms.

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

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

swell around 4 feet. Isolated thunderstorms. Scattered showers.

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

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

showers. Isolated thunderstorms.

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

period 7 seconds. Isolated showers.



$$



AMZ741-211715-

Mona Passage Southward to 17N-

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



.REST OF TONIGHT...Northeast winds 10 to 15 knots. Seas 3 to 5

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

Scattered showers and isolated thunderstorms.

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

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

showers through the day. Isolated thunderstorms in the afternoon.

.FRIDAY NIGHT...Northeast winds 10 to 15 knots. Seas 2 to 4 feet

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

Isolated thunderstorms in the evening. Scattered showers through

the night.

.SATURDAY...Northeast winds 10 to 15 knots veering southeast in

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

Dominant period 8 seconds. Numerous showers and isolated

thunderstorms.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots. Seas 5 to 7 feet

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

Northeast swell around 4 feet after midnight. Scattered 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 11 seconds.

Southeast swell 4 to 7 feet. Isolated thunderstorms. Numerous

showers.

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

occasional seas up to 9 feet. Dominant period 7 seconds. Scattered

showers.

.TUESDAY...East winds 15 to 20 knots. Seas 2 to 4 feet with

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

showers.



$$



AMZ742-211715-

Coastal Waters of Northwestern Puerto Rico out 10 NM-

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

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

Scattered showers.

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

period 8 seconds. Numerous showers and isolated thunderstorms.

.FRIDAY NIGHT...Northeast winds 10 to 15 knots. Seas 2 to 4 feet

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

Scattered showers through the night. Isolated thunderstorms after

midnight.

.SATURDAY...Northeast winds 15 to 20 knots veering southeast in

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

Dominant period 7 seconds. Numerous showers and isolated

thunderstorms.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots. Seas 4 to 6 feet

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

Numerous showers and isolated thunderstorms.

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

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

swell 4 to 6 feet. Isolated thunderstorms. Numerous showers.

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

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

showers.

.TUESDAY...Southeast winds 10 to 15 knots. Seas 1 to 3 feet.

Dominant period 7 seconds. Isolated thunderstorms. Scattered

showers.



$$



AMZ745-211715-

Coastal Waters of Southwestern Puerto Rico out 10 NM-

1212 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



.REST OF TONIGHT...Northeast winds 5 to 10 knots. Seas 1 to 3

feet. Dominant period 7 seconds. Isolated showers.

.FRIDAY...Northeast winds 5 to 10 knots veering south in the

afternoon. 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 10 to 15 knots veering southeast in

the afternoon. 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. Seas 2 to 4 feet

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

Numerous showers and isolated thunderstorms.

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

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

thunderstorms. Numerous showers.

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

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

thunderstorms. Scattered showers.

.TUESDAY...East winds 10 to 15 knots. Seas 2 feet or less.

Dominant period 7 seconds. Isolated thunderstorms, then isolated

showers.



$$

