

422 

FZCA52 TJSJ 210724

CWFSJU



Coastal Waters Forecast

National Weather Service San Juan PR

324 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.



AMZ700-212030-

324 AM AST Fri Aug 21 2020



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

Shower and thunderstorm activity will linger across portions of the 

local waters through this morning as a tropical wave moves away. 

Tropical Depression Thirteen is expected to intensify into a Tropical

Storm into the upcoming weekend, and Tropical Storm conditions are 

likely across portions of the local waters later tonight 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.



$$



AMZ710-212030-

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

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

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

thunderstorms through the day. Scattered showers in the afternoon.

.TONIGHT... Tropical storm conditions expected. Northeast winds 15

to 20 knots rising to 30 to 35 knots with gusts to around 50 knots

after midnight. Seas 5 to 7 feet with occasional seas up to 9 feet

building to 12 to 14 feet with occasional seas up to 17 feet after

midnight. Dominant period 10 seconds. North swell 4 to 6 feet

after midnight. Numerous showers and isolated thunderstorms.

.SATURDAY... Tropical storm conditions possible. East winds 30 to

35 knots with gusts to around 50 knots becoming southeast 20 to 25

knots in the afternoon. Seas 12 to 14 feet with occasional seas up

to 17 feet. Dominant period 10 seconds. Northeast swell 4 to 6

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 5 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 10 seconds. East

swell around 4 feet. Isolated showers in the morning, then

isolated thunderstorms in the afternoon.

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

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

showers.

.MONDAY...Northeast winds 15 to 20 knots. Seas 3 to 5 feet with

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

showers.

.MONDAY NIGHT...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.

.TUESDAY...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. Scattered showers.



$$



AMZ712-212030-

Coastal Waters of Northern Puerto Rico out 10 NM-

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



.TODAY...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.

.TONIGHT...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 4 to 6 feet with occasional seas up to 8 feet.

Dominant period 8 seconds. Numerous showers and isolated

thunderstorms.

.SATURDAY NIGHT...Southeast winds 10 to 15 knots. Seas 5 to 7 feet

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

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.

Scattered showers through the day. Isolated thunderstorms in the

afternoon.

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

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

showers.

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

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

showers.

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

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

showers and 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.



$$



AMZ715-212030-

Coastal Waters of Northern USVI and Culebra out 10 NM-

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

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

thunderstorms through the day. Scattered showers in the afternoon.

.TONIGHT... Tropical storm conditions expected. Northeast winds 15

to 20 knots rising to 30 to 35 knots with gusts to around 50 knots

after midnight. Seas 4 to 6 feet with occasional seas up to 8

feet. Dominant period 10 seconds. Numerous showers and isolated

thunderstorms.

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

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

Numerous showers and isolated thunderstorms.

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

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

showers.

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

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

showers.

.MONDAY...Northeast winds 15 to 20 knots. Seas 2 to 4 feet with

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

showers.

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

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

showers and isolated thunderstorms.

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

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

showers and isolated thunderstorms.



$$



AMZ722-212030-

Anegada Passage Southward to 17N-

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



.TODAY...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.

.TONIGHT...Northeast winds 10 to 15 knots. Seas 8 to 10 feet with

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

Northeast swell 4 to 5 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 10 seconds.

Northeast swell 4 to 5 feet. Numerous showers and isolated

thunderstorms.

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

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

Northeast swell around 4 feet in the evening. Isolated

thunderstorms in the evening. Scattered showers through the night.

.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.

.SUNDAY NIGHT...East winds 15 to 20 knots. 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. Scattered showers.

.MONDAY NIGHT...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 6 seconds. Isolated

thunderstorms in the morning. Scattered showers through the day.



$$



AMZ725-212030-

Coastal Waters of Southern USVI Vieques and Eastern Puerto Rico out

10 NM-

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

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

thunderstorms through the day. Scattered showers in the afternoon.

.TONIGHT...Northeast winds 10 to 15 knots. Seas 6 to 8 feet with

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

swell around 4 feet. 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 in the evening. 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.

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

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

showers.

.MONDAY...Northeast winds 15 to 20 knots. Seas 3 to 5 feet with

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

showers.

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

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

showers and isolated thunderstorms.

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

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

showers and isolated thunderstorms.



$$



AMZ732-212030-

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

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

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

thunderstorms through the day. Scattered showers in the afternoon.

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

occasional seas up to 9 feet. Dominant period 10 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.

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 in the morning, then isolated thunderstorms in the

afternoon.

.SUNDAY NIGHT...East winds 15 to 20 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. Seas 4 to 6 feet with

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

showers.

.MONDAY NIGHT...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. Scattered showers and 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 in the morning. Scattered showers through the day.



$$



AMZ735-212030-

Coastal Waters of Southern Puerto Rico out 10 NM-

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

period 7 seconds. Scattered showers through the day. Isolated

thunderstorms in the afternoon.

.TONIGHT...Northeast winds 10 to 15 knots. Seas 1 to 3 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 8 seconds. Numerous

showers and isolated thunderstorms.

.SATURDAY NIGHT...Southeast winds 15 to 20 knots. Seas 3 to 5 feet

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

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. Scattered

showers through the day. Isolated thunderstorms in the afternoon.

.SUNDAY 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 through the night.

.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 through the day. Isolated thunderstorms in the afternoon.

.MONDAY 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 and 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 and isolated thunderstorms.



$$



AMZ741-212030-

Mona Passage Southward to 17N-

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



.TODAY...East winds 5 to 10 knots. 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.

.TONIGHT...Northeast 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.

.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 4 to 6 feet

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

Numerous showers and isolated thunderstorms.

.SUNDAY...Southeast winds 15 to 20 knots. Seas 4 to 6 feet with

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

Scattered showers and isolated thunderstorms.

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

after midnight. Seas 4 to 6 feet with occasional seas up to 8

feet. Dominant period 10 seconds. Isolated showers through the

night.

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

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

Dominant period 7 seconds. Isolated showers.

.MONDAY NIGHT...Northeast 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. Scattered showers.

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

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

showers.



$$



AMZ742-212030-

Coastal Waters of Northwestern Puerto Rico out 10 NM-

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

period 8 seconds. Isolated thunderstorms through the day. Numerous

showers in the afternoon.

.TONIGHT...Northeast 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.

.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 8 seconds. Numerous showers and isolated

thunderstorms.

.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...Southeast winds 10 to 15 knots. 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.

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

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

.MONDAY...East winds 10 to 15 knots backing north in the

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

Dominant period 7 seconds. Isolated showers.

.MONDAY NIGHT...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...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.



$$



AMZ745-212030-

Coastal Waters of Southwestern Puerto Rico out 10 NM-

324 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

afternoon. Seas 2 feet or less. Dominant period 8 seconds.

Numerous showers through the day. Isolated thunderstorms in the

afternoon.

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

Dominant period 8 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 1 to 3

feet. Dominant period 7 seconds. Numerous showers and isolated

thunderstorms.

.SUNDAY...Southeast winds 15 to 20 knots. Seas 1 to 3 feet.

Dominant period 7 seconds. Scattered showers through the day.

Isolated thunderstorms in the afternoon.

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

Dominant period 7 seconds.

.MONDAY...Southeast winds 5 to 10 knots. Seas 1 to 3 feet.

Dominant period 7 seconds. Scattered showers through the day.

Isolated thunderstorms in the afternoon.

.MONDAY NIGHT...Northeast winds 10 to 15 knots. Seas 1 to 3 feet.

Dominant period 7 seconds. Isolated showers.

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

Dominant period 7 seconds. Scattered showers through the day.

Isolated thunderstorms in the afternoon.



$$

