581  
WHCA72 TJSJ 210856  
MWWSJU  
 
URGENT - MARINE WEATHER MESSAGE  
NATIONAL WEATHER SERVICE SAN JUAN PR  
456 AM AST SAT APR 21 2018  
 
...A NORTHEASTERLY SWELL WILL CONTINUE TO CREATE SEAS UP TO  
7 FEET ACROSS THE OFFSHORE ATLANTIC WATERS...  
 
...HAZARDOUS SEAS WILL CONTINUE ACROSS THE OFFSHORE ATLANTIC  
WATERS DUE TO A LONG PERIOD NORTHEASTERLY SWELL...  
 
AMZ710-212000-  
/O.CON.TJSJ.SC.Y.0026.000000T0000Z-180421T2200Z/  
ATLANTIC WATERS OF PUERTO RICO AND USVI FROM 10 NM TO 19.5N-  
456 AM AST SAT APR 21 2018  
 
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 6 PM AST THIS  
EVENING...  
 
* WINDS...EAST WINDS 15 TO 20 KNOTS.  
 
* SEAS...6 TO 7 FEET WITH OCCASIONAL SEAS UP TO 9 FEET.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A SMALL CRAFT ADVISORY MEANS THAT WIND SPEEDS OF 21 TO 33 KNOTS  
AND/OR SEAS OF 7 FEET OR GREATER ARE EXPECTED TO PRODUCE  
HAZARDOUS WAVE CONDITIONS TO SMALL CRAFT. INEXPERIENCED  
MARINERS...ESPECIALLY THOSE OPERATING SMALLER VESSELS SHOULD  
AVOID NAVIGATING IN THESE CONDITIONS.  
 

 
 

 
 
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