516  
FZUS52 KJAX 200053  
CWFJAX  
 
COASTAL WATERS FORECAST FOR NORTHEAST FLORIDA/SOUTHEAST GEORGIA  
NATIONAL WEATHER SERVICE JACKSONVILLE FL  
853 PM EDT MON APR 19 2021  
 
ATLANTIC COASTAL WATERS FROM ALTAMAHA SOUND GA TO FLAGLER BEACH FL  
OUT TO 60 NM.  
 
SEAS ARE PROVIDED AS A RANGE OF THE AVERAGE HEIGHT OF THE HIGHEST  
1/3 OF THE WAVES, ALONG WITH THE OCCASIONAL HEIGHT OF THE AVERAGE  
HIGHEST 1/10 OF THE WAVES.  
 
AMZ400-200930-  
SYNOPSIS FOR ALTAMAHA SOUND GA TO FLAGLER BEACH FL OUT TO 60 NM-  
853 PM EDT MON APR 19 2021  
   
SYNOPSIS
 
 
THE FRONTAL BOUNDARY SOUTH OF THE AREA WATERS WILL BACK TO THE  
NORTH OVERNIGHT AND INTO TUESDAY AS A LOW PRESSURE SYSTEM DEVELOPS  
OVER CENTRAL FLORIDA AND MOVES NORTHEAST. THIS BOUNDARY WILL SLIP  
BACK TO THE SOUTH TUESDAY NIGHT. ANOTHER COLD FRONT WILL MOVE  
SOUTHEAST ACROSS AREA WEDNESDAY INTO WEDNESDAY NIGHT CAUSING  
STRENGTHENING NORTHWEST TO NORTH WINDS AND BUILDING SEAS. HIGH  
PRESSURE WILL BUILD TO THE NORTHWEST THURSDAY, THEN NORTH  
NORTHEAST FRIDAY. THE HIGH WILL MOVE MORE TOWARD THE EAST FRIDAY  
NIGHT AS A WARM FRONT LIFTS NORTHEAST ACROSS AREA. A COLD FRONT  
WILL MOVE SOUTHEAST ACROSS REGION SATURDAY NIGHT INTO SUNDAY.  
   
GULF STREAM
 
 
THE APPROXIMATE LOCATION OF THE WEST WALL OF THE GULF STREAM AS OF  
APR 17, 2021 AT 1200 UTC...  
 
62 NAUTICAL MILES EAST OF FLAGLER BEACH.  
68 NAUTICAL MILES EAST OF SAINT AUGUSTINE BEACH.  
81 NAUTICAL MILES EAST OF JACKSONVILLE BEACH.  
85 NAUTICAL MILES EAST SOUTHEAST OF ST SIMONS ISLAND.  
 
THIS DATA COURTESY OF THE NAVAL OCEANOGRAPHIC OFFICE.  
 

 
 
AMZ450-452-454-200930-  
COASTAL WATERS FROM ALTAMAHA SOUND TO FERNANDINA BEACH FL OUT  
20 NM-  
COASTAL WATERS FROM FERNANDINA BEACH TO ST. AUGUSTINE FL OUT  
20 NM-  
COASTAL WATERS FROM ST. AUGUSTINE TO FLAGLER BEACH FL OUT 20 NM-  
853 PM EDT MON APR 19 2021  
   
TONIGHT
 
SOUTHEAST WINDS 5 TO 10 KNOTS BECOMING EAST AFTER  
MIDNIGHT. SEAS 1 TO 2 FEET WITH A DOMINANT PERIOD 10 SECONDS.  
MOSTLY SMOOTH ON THE INTRACOASTAL WATERS.    
TUESDAY
 
EAST WINDS 5 TO 10 KNOTS. SEAS 2 TO 3 FEET WITH A  
DOMINANT PERIOD 10 SECONDS. A LIGHT CHOP ON THE INTRACOASTAL  
WATERS. CHANCE OF SHOWERS. SLIGHT CHANCE OF THUNDERSTORMS IN THE  
AFTERNOON.    
TUESDAY NIGHT
 
SOUTH WINDS 5 TO 10 KNOTS BECOMING WEST AFTER  
MIDNIGHT. SEAS 2 TO 3 FEET WITH A DOMINANT PERIOD 5 SECONDS.  
MOSTLY SMOOTH ON THE INTRACOASTAL WATERS. SLIGHT CHANCE OF  
SHOWERS IN THE EVENING.    
WEDNESDAY
 
WEST WINDS 5 TO 10 KNOTS. SEAS 2 TO 3 FEET. A LIGHT  
CHOP ON THE INTRACOASTAL WATERS.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 15 TO 20 KNOTS BECOMING NORTH  
AFTER MIDNIGHT. SEAS 3 TO 4 FEET. CHOPPY ON THE INTRACOASTAL  
WATERS.    
THURSDAY
 
NORTH WINDS 15 TO 20 KNOTS BECOMING NORTHEAST 10 TO  
15 KNOTS IN THE AFTERNOON. SEAS 3 TO 4 FEET. CHOPPY ON THE  
INTRACOASTAL WATERS.    
THURSDAY NIGHT
 
EAST WINDS 5 TO 10 KNOTS. SEAS 2 TO 3 FEET.    
FRIDAY
 
EAST WINDS 10 TO 15 KNOTS. SEAS 3 TO 4 FEET.    
FRIDAY NIGHT
 
SOUTHEAST WINDS 10 TO 15 KNOTS. SEAS 3 TO 4 FEET.  
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.    
SATURDAY
 
SOUTH WINDS 15 TO 20 KNOTS. SEAS 3 TO 5 FEET. SHOWERS  
LIKELY AND SLIGHT CHANCE OF THUNDERSTORMS.  
 

 
 
AMZ470-472-474-200930-  
WATERS FROM ALTAMAHA SOUND GA TO FERNANDINA BEACH FL FROM 20 TO  
60 NM-  
WATERS FROM FERNANDINA BEACH TO ST. AUGUSTINE FL FROM 20 TO 60 NM-  
WATERS FROM ST. AUGUSTINE TO FLAGLER BEACH FL FROM 20 TO 60 NM-  
853 PM EDT MON APR 19 2021  
   
TONIGHT
 
SOUTHEAST WINDS 5 TO 10 KNOTS BECOMING EAST AFTER  
MIDNIGHT. SEAS 2 TO 3 FEET WITH A DOMINANT PERIOD 11 SECONDS.    
TUESDAY
 
EAST WINDS 10 TO 15 KNOTS. SEAS 2 TO 3 FEET WITH A  
DOMINANT PERIOD 10 SECONDS. CHANCE OF SHOWERS. SLIGHT CHANCE OF  
THUNDERSTORMS IN THE AFTERNOON.    
TUESDAY NIGHT
 
SOUTHEAST WINDS 5 TO 10 KNOTS BECOMING WEST  
10 TO 15 KNOTS AFTER MIDNIGHT. SEAS 2 TO 3 FEET WITH A DOMINANT  
PERIOD 5 SECONDS. SLIGHT CHANCE OF THUNDERSTORMS IN THE EVENING.  
SLIGHT CHANCE OF SHOWERS.    
WEDNESDAY
 
NORTHWEST WINDS 10 TO 15 KNOTS BECOMING WEST 5 TO  
10 KNOTS IN THE AFTERNOON. SEAS 2 TO 3 FEET.    
WEDNESDAY NIGHT
 
WEST WINDS 15 TO 20 KNOTS BECOMING NORTH AFTER  
MIDNIGHT. SEAS 3 TO 4 FEET.    
THURSDAY
 
NORTH WINDS 15 TO 20 KNOTS BECOMING NORTHEAST 10 TO  
15 KNOTS IN THE AFTERNOON. SEAS 3 TO 5 FEET.    
THURSDAY NIGHT
 
EAST WINDS 5 TO 10 KNOTS. SEAS 3 TO 4 FEET.    
FRIDAY
 
EAST WINDS 10 TO 15 KNOTS. SEAS 3 TO 4 FEET.    
FRIDAY NIGHT
 
SOUTHEAST WINDS 15 TO 20 KNOTS. SEAS 3 TO 5 FEET.  
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.    
SATURDAY
 
SOUTH WINDS 15 TO 20 KNOTS. SEAS 4 TO 6 FEET. CHANCE  
OF SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS.  
 

 
 
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