759
FLCA42 TJSJ 170851
HWOSJU
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JUAN PR
451 AM AST WED SEP 17 2025
AMZ711>745-PRZ001>013-181000-
SAN JUAN AND VICINITY-NORTHEAST-SOUTHEAST-EASTERN INTERIOR-
NORTH CENTRAL-CENTRAL INTERIOR-PONCE AND VICINITY-NORTHWEST-
WESTERN INTERIOR-MAYAGUEZ AND VICINITY-SOUTHWEST-CULEBRA-VIEQUES-
THE NEARSHORE AND OFF SHORE ATLANTIC AND CARIBBEAN COASTAL WATERS-
451 AM AST WED SEP 17 2025
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF PUERTO RICO.
DAY ONE
TODAY AND TONIGHT
LIGHTNING
ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED. BE
READY TO STOP OUTDOOR ACTIVITIES AND SEEK SHELTER IF STORMS
DEVELOP. WHEN THUNDER ROARS, GO INDOORS.
EXCESSIVE RAINFALL
HEAVY DOWNPOURS MAY CAUSE FLOODING IN URBAN
AREAS, ROADS, AND SMALL STREAMS ACROSS MUCH OF PUERTO RICO, WITH
THE HEAVIEST ACTIVITY IN THE AFTERNOON. THERE IS A LOW CHANCE OF
FLASH FLOODS AND LANDSLIDES, ESPECIALLY WHERE SOILS ARE ALREADY SATURATED.
BRIEF PONDING ON ROADS AND POOR DRAINAGE AREAS IS ALSO POSSIBLE,
PARTICULARLY ACROSS SOUTHWESTERN PUERTO RICO.
EXCESSIVE HEAT
THIS LEVEL OF HEAT AFFECTS MAINLY THOSE
EXTREMELY SENSITIVE TO HIGH TEMPERATURES, ESPECIALLY WHEN OUTDOORS
WITHOUT PROPER COOLING OR HYDRATION. WHILE THE GREATEST THREAT IS
IN URBAN AND COASTAL AREAS OF PUERTO RICO, UNCOMFORTABLE HEAT IS
LIKELY EVERYWHERE. TAKE PRECAUTIONS: DRINK PLENTY OF WATER, LIMIT
TIME OUTDOORS, REST IN SHADE OR AIR CONDITIONING, AND WEAR LIGHT
CLOTHING.
WIND
BREEZY CONDITIONS (18–22 KTS / 21–25 MPH) ARE EXPECTED,
ESPECIALLY ALONG EXPOSED COASTAL AREAS OF VIEQUES AND CULEBRA.
SECURE ANY LOOSE OUTDOOR ITEMS THAT COULD BE BLOWN AROUND.
MARINE CONDITIONS
SMALL CRAFT SHOULD EXERCISE CAUTION,
ESPECIALLY ACROSS THE OFFSHORE ATLANTIC WATERS, WHERE CHOPPY SEAS
AND HIGHER WINDS ARE EXPECTED.
RIP CURRENTS
LIFE-THREATENING RIP CURRENTS ARE POSSIBLE ALONG
THE NORTH AND EAST COASTS OF PUERTO RICO, INCLUDING VIEQUES AND
CULEBRA. STRONGER CURRENTS MAY ALSO OCCUR ELSEWHERE, ESPECIALLY
NEAR PIERS, JETTIES, AND CHANNELS.
DAYS TWO THROUGH SEVEN
THURSDAY THROUGH TUESDAY
LINGERING MOISTURE FROM A DEPARTING TROPICAL WAVE, COMBINED WITH
INSTABILITY FROM AN UPPER-LEVEL TROUGH, WILL CONTINUE TO GENERATE
SHOWERS AND THUNDERSTORMS INTO THURSDAY, MAINTAINING THE RISK OF
FLOODING AND LANDSLIDES, ESPECIALLY WHERE SOILS ARE ALREADY
SATURATED. THIS RISK WILL PERSIST EACH AFTERNOON BEYOND THURSDAY,
THOUGH IT WILL BECOME MORE LOCALIZED. LOCALLY BREEZY CONDITIONS ON
THURSDAY WILL ALSO KEEP SEAS CHOPPY ACROSS THE OFFSHORE ATLANTIC
WATERS, WHERE SMALL CRAFT SHOULD EXERCISE CAUTION. A MODERATE RIP
CURRENT RISK WILL CONTINUE INTO EARLY NEXT WEEK, WITH A CHANCE OF
ISOLATED HIGH RISK OVER THE WEEKEND. HEAT CONCERNS WILL PERSIST,
EVEN DURING RAINY PERIODS, WITH THE MOST DANGEROUS CONDITIONS
EXPECTED FRIDAY INTO THE WEEKEND WHEN RAINFALL COVERAGE IS LOWER.
SPOTTER INFORMATION STATEMENT
SPOTTER ACTIVATION IS ENCOURAGED. PLEASE RELAY ANY INFORMATION
ABOUT FLOODING, WINDS, WAVES, AND RIP CURRENTS TO THE NATIONAL
WEATHER SERVICE IN SAN JUAN.
AMZ716-726-VIZ001-002-181000-
ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX-
NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS-
451 AM AST WED SEP 17 2025
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF USVI.
DAY ONE
TODAY AND TONIGHT
LIGHTNING
ISOLATED THUNDERSTORMS ARE EXPECTED. STAY ALERT AND
BE PREPARED TO TAKE SHELTER IF STORMS DEVELOP.
EXCESSIVE RAINFALL
HEAVY DOWNPOURS MAY CAUSE FLOODING IN URBAN
AREAS, ROADS, AND SMALL STREAMS. THERE IS A LOW CHANCE OF FLASH
FLOODS AND LANDSLIDES, ESPECIALLY WHERE SOILS ARE ALREADY
SATURATED.
EXCESSIVE HEAT
THIS LEVEL OF HEAT AFFECTS MAINLY THOSE
EXTREMELY SENSITIVE TO HIGH TEMPERATURES, ESPECIALLY WHEN OUTDOORS
WITHOUT PROPER COOLING OR HYDRATION. WHILE THE GREATEST THREAT IS
IN URBAN AND COASTAL AREAS OF PUERTO RICO, UNCOMFORTABLE HEAT IS
LIKELY EVERYWHERE. TAKE PRECAUTIONS: DRINK PLENTY OF WATER, LIMIT
TIME OUTDOORS, REST IN SHADE OR AIR CONDITIONING, AND WEAR LIGHT
CLOTHING.
WIND
BREEZY CONDITIONS (18–22 KTS / 21–25 MPH) ARE EXPECTED,
ESPECIALLY ALONG EXPOSED COASTAL AREAS OF ST THOMAS AND ST JOHN.
SECURE ANY LOOSE OUTDOOR ITEMS THAT COULD BE BLOWN AROUND.
MARINE CONDITIONS
SMALL CRAFT SHOULD EXERCISE CAUTION,
ESPECIALLY ACROSS THE OFFSHORE ATLANTIC WATERS, WHERE CHOPPY SEAS
AND HIGHER WINDS ARE EXPECTED.
RIP CURRENTS
LIFE-THREATENING RIP CURRENTS ARE POSSIBLE ALONG
THE MOST BEACHES OF ST CROIX. STRONGER CURRENTS MAY ALSO OCCUR
ELSEWHERE, ESPECIALLY NEAR PIERS, JETTIES, AND CHANNELS.
DAYS TWO THROUGH SEVEN
THURSDAY THROUGH TUESDAY
LINGERING MOISTURE FROM A DEPARTING TROPICAL WAVE, COMBINED WITH
INSTABILITY FROM AN UPPER-LEVEL TROUGH, WILL CONTINUE TO GENERATE
SHOWERS AND THUNDERSTORMS INTO THURSDAY, MAINTAINING THE RISK OF
FLOODING. LOCALLY BREEZY CONDITIONS ON THURSDAY WILL ALSO KEEP
SEAS CHOPPY ACROSS THE OFFSHORE ATLANTIC WATERS, WHERE SMALL CRAFT
SHOULD EXERCISE CAUTION. A MODERATE RIP CURRENT RISK WILL
CONTINUE INTO EARLY NEXT WEEK. HEAT CONCERNS WILL PERSIST, EVEN
DURING RAINY PERIODS, WITH THE MOST DANGEROUS CONDITIONS EXPECTED
FRIDAY INTO THE WEEKEND WHEN RAINFALL COVERAGE IS LOWER.
SPOTTER INFORMATION STATEMENT
SPOTTER ACTIVATION IS ENCOURAGED. PLEASE RELAY ANY INFORMATION
ABOUT FLOODING, WINDS, WAVES, AND RIP CURRENTS TO THE NATIONAL
WEATHER SERVICE IN SAN JUAN.
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