420  
FLCA42 TJSJ 170911  
HWOSJU  
 
HAZARDOUS WEATHER OUTLOOK  
NATIONAL WEATHER SERVICE SAN JUAN PR  
511 AM AST TUE SEP 17 2019  
 
AMZ710>745-PRZ001>013-180915-  
SAN JUAN AND VICINITY-NORTHEAST-SOUTHEAST-EASTERN INTERIOR-  
NORTH CENTRAL-CENTRAL INTERIOR-PONCE AND VICINITY-NORTWEST-  
WESTERN INTERIOR-MAYAGUEZ AND VICINITY-SOUTHWEST-CULEBRA-VIEQUES-  
THE NEARSHORE AND OFF SHORE ATLANTIC AND CARIBBEAN COASTAL WATERS-  
511 AM AST TUE SEP 17 2019  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT  
ATLANTIC COASTAL WATERS.  
   
DAY ONE
 
TODAY AND TONIGHT  
   
THUNDERSTORMS
 
THERE IS A CHANCE OF THUNDERSTORMS WITH HEAVY  
RAINFALL AND BRIEF GUSTY WINDS THIS AFTERNOON ACROSS PORTIONS OF THE  
INTERIOR AND WESTERN PUERTO RICO.  
   
FLOODING
 
HEAVY RAINS COULD LEAD TO URBAN AND SMALL STREAM  
FLOODING.  
   
WIND
 
SUSTAINED WINDS IN EXCESS OF 20 MPH/17 KNOTS ARE EXPECTED  
ACROSS THE ATLANTIC, CARIBBEAN AND MONA PASSAGE. AC  
   
WAVES
 
CHOPPY/ROUGH SEAS UP TO 10 FEET EXPECTED ACROSS THE  
NORTHEASTERN ATLANTIC WATERS, ELSEWHERE SEAS UP TO 9 ACROSS THE LOCAL  
AND OUTER WATERS.  
   
RIP CURRENTS
 
THERE IS A HIGH RISK OF RIP CURRENTS FOR THE NORTHERN  
BEACHES OF PUERTO RICO, NORTHWEST BEACH OF VIEQUES AND THE NORTHERN  
BEACHES OF CULEBRA.  
   
HEAT
 
EAST TO SOUTHEASTERLY TRADE WINDS WILL RESULT IN ABOVE NORMAL  
HEAT INDICES OF 102 TO 107 DEGREES ACROSS THE COASTAL AND LOWER  
ELEVATIONS OF PUERTO RICO.  
   
DAYS TWO THROUGH SEVEN
 
WEDNESDAY THROUGH MONDAY  
 
A LONG PERIOD NORTHERLY SWELL IS EXPECTED TO RESULT IN HAZARDOUS  
SEAS ACROSS THE ATLANTIC WATERS AND LOCAL PASSAGES THROUGH THE END  
OF THE WORK WEEK. IN ADDITION TO THE HAZARDOUS SEAS, THERE WILL  
ALSO BE A HIGH RISK OF RIP CURRENTS FOR SEVERAL OF THE LOCAL  
BEACHES. A DRY SAHARAN AIR MASS WILL HOLD OVER THE AREA THROUGH  
WEDNESDAY AND LIMIT SHOWERS DEVELOPMENT. ON THURSDAY MOISTURE IS  
EXPECTED TO LIFT OUT OF THE CARIBBEAN WATERS, AND INCREASE SHOWERS AND  
ISOLATED THUNDERSTORMS.  
   
SPOTTER INFORMATION STATEMENT
 
 
WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL  
SPOTTER ARE ENCOURAGED TO REPORT HIGH WINDS, FLOODING, AND RIP  
CURRENTS TO THE NATIONAL WEATHER SERVICE IN SAN JUAN.  
 

 
 
AMZ715-725-VIZ001-002-180915-  
ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX-  
NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS-  
511 AM AST TUE SEP 17 2019  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE  
ADJACENT COASTAL WATERS.  
   
DAY ONE
 
TODAY AND TONIGHT  
   
WIND
 
SUSTAINED WINDS IN EXCESS OF 20 MPH/17 KNOTS ARE POSSIBLE  
ACROSS THE LOCAL ATLANTIC AND CARIBBEAN WATERS.  
   
WAVES
 
CHOPPY/ROUGH SEAS UP TO 7 FEET EXPECTED ACROSS THE CARIBBEAN  
AND OUTER ATLANTIC WATERS.  
   
RIP CURRENTS
 
THERE IS A HIGH RISK OF RIP CURRENTS FOR THE NORTHERN  
BEACHES OF U.S. VIRGIN ISLANDS.  
   
HEAT
 
EAST TO SOUTHEASTERLY TRADE WINDS WILL RESULT IN ABOVE  
NORMAL HEAT INDICES OF 102 TO 107.  
   
DAYS TWO THROUGH SEVEN
 
WEDNESDAY THROUGH MONDAY  
 
A LONG PERIOD NORTHERLY SWELL IS EXPECTED TO RESULT IN HAZARDOUS  
SEAS ACROSS THE ATLANTIC WATERS AND LOCAL PASSAGES THROUGH THE END  
OF THE WORK WEEK. IN ADDITION TO THE HAZARDOUS SEAS, THERE WILL  
ALSO BE A HIGH RISK OF RIP CURRENTS FOR SEVERAL OF THE LOCAL  
BEACHES. A DRY SAHARAN AIR MASS WILL HOLD OVER THE AREA THROUGH  
WEDNESDAY AND LIMIT SHOWERS DEVELOPMENT. ON THURSDAY MOISTURE IS  
EXPECTED TO LIFT OUT OF THE CARIBBEAN WATERS, AND INCREASE SHOWERS AND  
ISOLATED THUNDERSTORMS.  
   
SPOTTER INFORMATION STATEMENT
 
 
WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL  
SPOTTER ARE ENCOURAGED TO REPORT HIGH WINDS, FLOODING , AND RIP  
CURRENTS TO THE NATIONAL WEATHER SERVICE IN SAN JUAN.  
 

 
 
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