

149 

FZCA52 TJSJ 210420 RRB

CWFSJU



Coastal Waters Forecast...DELAYED

National Weather Service San Juan PR

1220 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-

1220 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-

1220 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 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... Tropical storm conditions possible. Northeast

winds 15 to 20 knots rising to 30 to 35 knots with gusts to around

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

to 13 feet. Dominant period 10 seconds. North swell 4 to 5 feet.

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 18 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 12 to 14

feet with occasional seas up to 18 feet. Dominant period 11

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

isolated thunderstorms.

.SUNDAY...East winds 15 to 20 knots. Seas 12 to 14 feet with

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

swell 5 to 10 feet. Scattered showers and isolated thunderstorms.

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

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

Southeast swell around 4 feet in the evening. Isolated showers.

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

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

showers and 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-

1220 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 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 8 to 10

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

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

isolated thunderstorms.

.SUNDAY...East 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. Scattered showers and isolated

thunderstorms.

.SUNDAY NIGHT...East winds 10 to 15 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. 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.

.MONDAY NIGHT...East 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.

.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 through the day. Isolated thunderstorms in the afternoon.



$$



AMZ715-211715-

Coastal Waters of Northern USVI and Culebra out 10 NM-

1220 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 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 and isolated thunderstorms.

.FRIDAY NIGHT... Tropical storm conditions possible. 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 6 to 8 feet with

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

Northeast 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 10

seconds. Northeast swell 4 to 8 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 8 seconds.

Northeast swell around 4 Feet. Isolated showers.

.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.

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

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

showers.



$$



AMZ722-211715-

Anegada Passage Southward to 17N-

1220 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 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 10 to 15 knots. Seas 8 to 10 feet

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

East swell 4 to 5 feet. Numerous showers and isolated

thunderstorms.

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

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

Northeast swell 5 to 10 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 4 to 5 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 7 seconds. Isolated

showers.

.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.

.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.

.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...Southeast winds 10 to 15 knots. Seas 3 to 5 feet with

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

showers.



$$



AMZ725-211715-

Coastal Waters of Southern USVI Vieques and Eastern Puerto Rico out

10 NM-

1220 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 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 and isolated thunderstorms.

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

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

seconds. Northeast swell 4 to 8 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 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. 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. 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.



$$



AMZ732-211715-

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

1220 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 3 to 5 feet

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

Numerous showers and isolated thunderstorms.

.SATURDAY...Southeast winds 15 to 20 knots. Seas 6 to 8 feet with

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

swell 4 to 6 feet in the afternoon. 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 11 seconds.

Northeast swell 4 to 6 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 10 seconds. North

swell up to 4 feet. Scattered showers and isolated thunderstorms.

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

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

swell up to 4 feet in the evening. Isolated showers.

.MONDAY...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 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. Scattered

showers.



$$



AMZ735-211715-

Coastal Waters of Southern Puerto Rico out 10 NM-

1220 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 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.

.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 5 to 7 feet

with occasional seas up to 9 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. Northeast

swell around 4 Feet. Scattered showers and isolated thunderstorms.

.SUNDAY NIGHT...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 5 to 10 knots. Seas 3 to 5 feet with

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

showers.

.MONDAY NIGHT...East 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.

.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-

1220 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 4 to 6 feet

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

Scattered showers and isolated thunderstorms.

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

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

Northeast swell up to 4 feet in the afternoon. Numerous showers

and isolated thunderstorms.

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

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

Northeast swell up to 4 feet shifting to the southeast after

midnight. Scattered showers.

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

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

swell up to 4 Feet. Isolated showers.

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

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

Scattered showers.

.TUESDAY...Southeast 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.



$$



AMZ742-211715-

Coastal Waters of Northwestern Puerto Rico out 10 NM-

1220 AM AST Fri Aug 21 2020



...TROPICAL STORM WATCH IN EFFECT...



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

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

showers.

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

occasional seas up to 6 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 10 to 15 knots. Seas 1 to 3 feet. Dominant

period 7 seconds. Scattered showers through the day. Isolated

thunderstorms in the afternoon.



$$



AMZ745-211715-

Coastal Waters of Southwestern Puerto Rico out 10 NM-

1220 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 2 feet or less. 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 1 to 3

feet. Dominant period 7 seconds. Numerous showers and isolated

thunderstorms.

.SUNDAY...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 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 veering southwest in the

afternoon. 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 2 feet or less.

Dominant period 7 seconds. Scattered showers through the day.

Isolated thunderstorms in the afternoon.



$$

