248  
AWCA82 TJSJ 170904  
RWSVI  
 
WEATHER SUMMARY FOR THE U.S. VIRGIN ISLANDS  
NATIONAL WEATHER SERVICE SAN JUAN PR  
427 AM AST TUE SEP 17 2019  
 
A TROPICAL WAVE IS CAUSING SHOWERS AND ISOLATED THUNDERSTORMS  
ACROSS THE SOUTHERN CARIBBEAN WATERS. THE STRONGEST SHOWERS  
REMAINED OVER THE LOCAL AND OUTER WATERS THIS MORNING. THE WAVE  
AND ITS MOISTURE WILL CONTINUE TO RACE OFF TO THE WEST TODAY.  
BEHIND THE TROPICAL WAVE IS A DRY SAHARAN AIR MASS WHICH IS  
EXPECTED TO HOLD OVER THE AREA THROUGH THURSDAY MORNING. THE DRIER  
AIR WILL LIMIT THE DEVELOPMENT OF SHOWERS AND ISOLATED  
THUNDERSTORMS DURING THE AFTERNOON. TODAY'S HIGH TEMPERATURES ARE  
FORECAST TO BE THE NEAR THE MIDDLE TO UPPER 80S WITH WINDS OUT OF  
THE EAST TO SOUTHEAST AT 15 TO 20 MPH.  
 
THURSDAY, TROPICAL MOISTURE IS FORECAST TO LIFT OUT OF THE  
CARIBBEAN WATERS AND OVER PUERTO RICO AND ADJACENT ISLANDS. THE  
INCREASE IN LOW-LEVEL MOISTURE WILL AID IN THE DEVELOPMENT OF  
SHOWERS AND ISOLATED THUNDERSTORMS.  
 
ACROSS THE REGIONAL WATERS, HAZARDOUS MARINE CONDITIONS WITH SEAS  
UP TO 8 FEET ARE EXPECTED ACROSS THE ATLANTIC WATERS AND ANEGADA  
PASSAGE TONIGHT DUE TO THE ARRIVAL OF A NORTHERLY SWELL. AS THIS  
SWELL SPREADS ACROSS THE LOCAL WATERS, SEAS UP TO 10 FEET ARE  
EXPECTED ACROSS ALL WATERS SURROUNDING THE LOCAL ISLANDS. AS A  
RESULT, SMALL CRAFT ADVISORIES ARE IN EFFECT. GIVEN THESE  
CONDITIONS, THERE IS A HIGH RISK OF RIP CURRENTS FOR A FEW BEACHES  
ALONG THE NORTHERN COAST OF SAINT THOMAS. AS CONDITIONS  
DETERIORATE TODAY, A HIGH RISK WILL BE EXPECTED FOR MOST LOCAL  
BEACHES.  
 

 
 
THIS PRODUCT IS ISSUED AROUND 5 AM AND 5 PM EACH DAY AND WEATHER  
CONDITIONS MAY CHANGE BETWEEN ISSUANCES. PLEASE VERIFY THE STATUS  
OF ANY WATCHES...WARNINGS OR ADVISORIES MENTIONED IN THIS PRODUCT.  
 
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