Upper level trough combined with daytime heating and local effects to produce scattered showers with isolated thunderstorms over the north central, western interior and west sections of Puerto Rico.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS SJU wrote it up.
Upper level trough combined with daytime heating and local effects to produce scattered showers with isolated thunderstorms over the north central, western interior and west sections of Puerto Rico.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Juan, PR wrote its last area forecast discussion before the first event at May 8, 3:53 PM AST, 1 hour 56 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 353 PM AST SUN MAY 8 2016 .SYNOPSIS...AT UPPER LEVELS...ALTHOUGH THE UPPER TROUGH WEST OF THE AREA WEAKENS THROUGH FRIDAY...A CUT-OFF LOW FORMS NORTH OF THE WINDWARD PASSAGE BRIEFLY ON TUESDAY AND THE TROUGH HOLDS WEST OF THE AREA UNTIL IT DISSIPATES. HIGH PRESSURE THEN DOMINATES THE SOUTHERN CARIBBEAN THROUGH MID WEEK NEXT WEEK. AT MID LEVELS...TROUGHINESS DOMINATES THE CENTRAL CARIBBEAN AND HISPANIOLA THROUGH THURSDAY. HIGH PRESSURE THEN NOSES INTO THE CARIBBEAN FROM THE EAST...BUT THE CENTER OF THE HIGH HOLDS BACK OVER THE WESTERN TROPICAL ATLANTIC. MOISTURE AT MID LEVELS IS MODERATE...EXCEPT FOR GOOD MOISTURE ON THURSDAY AND THE FOLLOWING WEEKEND. AT LOWER LEVELS...AS THE TROUGH WEAKENS OVER THE LOCAL AREA...HIGH PRESSURE IN THE CENTRAL ATLANTIC ALSO WEAKENS AND STRETCHES ACROSS THE SUB TROPICAL ATLANTIC TO THE EAST COAST OF THE UNITED STATES. WHEN HIGH PRESSURE RETURNS TO THE EASTERN ATLANTIC AFTER MID WEEK...FLOW AGAIN BECOMES MORE SOUTHEASTERLY. && .DISCUSSION...THE FRONTAL BOUNDARY THAT MOVED INTO THE LOCAL AREA WITH VIGOR FADED DURING THE DAY AND BY 08/18Z ONLY A FEW AREAS OF LIGHT TO MODERATE RAIN WERE LEFT IN THE LOCAL CARIBBEAN WATERS. A FEW SMALL SHOWERS ALSO DEVELOPED AFTER NOON IN LUQUILLO. THEY ARE DRIFTING WITH THE LOW LEVEL FLOW TO THE NORTH NORTHWEST. THE GFS HAS BACKED AWAY FROM THE HIGHER PROBABILITIES OF RAIN THAT IT HAD FOR THE LOCAL AREA TONIGHT AND MONDAY. IT IS ALSO NO LONGER SHOWING ANY DIVERGENCE ALOFT OVER PUERTO RICO OR THE U.S. VIRGIN ISLANDS UNTIL MONDAY WHEN POSITIVE VALUES ARE SLIGHT. WITH THE TROUGH TO THE WEST AT UPPER LEVELS AND A WEAK DOWNSTREAM-SIDE JET ON THE RIGHT HAND SIDE OF THE TROUGH PULLING BACK OVER PUERTO RICO ON TUESDAY AND PRECIPITABLE WATER HOLDING ABOVE 1.9 INCHES... CONDITIONS ARE STILL FAVORABLE FOR SHOWERS AND ISOLATED THUNDERSTORMS. DYNAMICS FOR THE FRONT HAVE GREATLY DISSIPATED DURING THE DAY...BUT SHOULD RE-GENERATE A LITTLE OVERNIGHT. FORWARD MOVEMENT IS NOT EXPECTED...HOWEVER...AND THE UPPER LEVEL TROUGH DOES NOT INCREASE IN STRENGTH DURING THE NEXT FEW DAYS. ALSO CLOUD COVER WILL PREVENT INTENSE HEATING OVER LAND. THEREFORE SHOWER ACTIVITY WILL BE MODEST AND URBAN AND SMALL STREAM FLOODING...IF ANY...WILL BE VERY LOCALIZED. SHOWER ACTIVITY WILL DIMINISH TUESDAY NIGHT AND WEDNESDAY...BUT GOOD MOISTURE AND DYNAMICS ARE TO INCREASE OVER THE WEEKEND. SOME INCREASED ACTIVITY IS EXPECTED OVER THE WEEKEND...BUT THE GFS SHOULD NOT BE TRUSTED TO DELIVER THE STRONG SIGNATURE AND DYNAMICS IT IS NOW SUGGESTING. && .AVIATION...MID TO LEVEL HIGH CLOUDS LIMITED THE SHRA/TSRA DEVELOPMENT OVER LAND AREAS EARLY THIS AFTERNOON. VFR CONDS ARE EXPECTED ACROSS MUCH OF THE TERMINALS. HOWEVER...SHRA/TSRA CAN STILL DEVELOP OVER THE WATERS AND AFFECT THE TERMINALS FROM EASTERN PR TO THE LEEWARD ISLANDS DURING THE OVERNIGHT HOURS. LIGHT AND VARIABLE WINDS WILL CONTINUE AT THE SFC...WITH A SOUTHEASTERLY WIND COMPONENT ALOFT. && .MARINE...SEAS WILL INCREASE SOME ON TUESDAY BUT ARE NOT EXPECTED TO REACH SMALL CRAFT ADVISORY CONDITIONS DURING THE NEXT 7 DAYS. WIND WAVES FROM THE EAST WILL PREVAIL. && .PRELIMINARY POINT TEMPS/POPS... SJU 75 87 76 86 / 50 50 40 40 STT 76 85 75 85 / 60 50 50 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. AM...NONE. && 13/12
PERSPECTIVAS SOBRE CONDICIONES PELIGROSAS DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 1021 AM AST SABADO 8 DE MAYO DE 2016 AMZ710>745-PRZ001>013-091430- SAN JUAN Y VECINDAD-NORESTE-SURESTE- INTERIOR ESTE-CENTRAL NORTE-INTERIOR CENTRAL-PONCE Y VECINDAD- NOROESTE-INTERIOR OESTE-MAYAGUEZ Y VECINDAD-SUROESTE-CULEBRA-VIEQUES- AGUAS COSTERAS Y MAR AFUERA DEL ATLANTICO Y DEL CARIBE- 1021 AM AST VIERNES 6 DE MAYO DE 2016 ESTA PERSPECTIVA SOBRE LAS CONDICIONES PELIGROSAS DEL TIEMPO ES PARA PUERTO RICO Y LAS AGUAS COSTERAS ADYACENTES DEL ATLANTICO. .DIA UNO...HOY Y ESTA NOCHE .TRONADAS...EXISTE UNA POSIBILIDAD DE TRONADAS CON LLUVIAS FUERTES Y BREVE VIENTOS EN RAFAGAS ESTA TARDE A TRAVES DE PORCIONES DE PUERTO RICO. TRONADAS FUERTES SOBRE LAS AGUAS DEL CARIBE SUR DE PUERTO RICO PODRAN PRODUCIR TROMBAS MARINAS Y VIENTOS EN RAFAGAS. .INUNDACIONES...FUERTES LLUVIAS FUERTES PODRIAN DAR PASO A INUNDACIONES URBANAS Y DE RIACHUELOS PEQUENOS. .VIENTOS...VIENTOS SOSTENIDOS EN EXCESO DE 20 MPH SE ESPERAN BREVEMENTE A TRAVES DE LAS AREAS PEQUENAS DE LAS AGUAS LOCALES CERCANAS A LAS TRONADAS. .OLAS/OLEAJE...OLEAJE PICADO/PELIGROSO DE HASTA 6 PIES SE ESPERAN A TRAVES DEL EXTERIOR DE LAS AGUAS LOCALES DEL ATLANTICO. .CORRIENTES SUBMARINAS...EXISTE UN RIESGO MODERADO DE CORRIENTES SUBMARINAS PARA PORCIONES DE LA COSTA ALREDEDOR DE PUERTO RICO. .DIAS DOS HASTA SIETE...LUNES HASTA SABADO AGUACEROS Y TRONADAS CON VIENTOS EN RAFAGOS Y INUNDACIONES URBANAS Y DE RIACHUELOS PEQUENOS SON PROBABLES EL LUNES Y TAMBIEN FINALES DE LA SEMANA. EL RIESGO DE CORRIENTES SUBMARINAS CONTINUARA MODERADO. .COMUNICADO SOBRE INFORMACION REPORTADA POR OBSERVADORES... NO SE ANTICIPA ACTIVACION AMPLIA DE OBSERVADORES...SIN EMBARGO...SE LES EXHORTA A LOS OBSERVADORES INDIVIDUALES A REPORTAR VIENTOS FUERTES...INUNDACIONES...TROMBAS MARINAS...O CORRIENTES SUBMARINAS AL SERVICIO NACIONAL DE METEOROLOGIA EN SAN JUAN. AMZ715-725-VIZ001-002-091430- SAN TOMAS SAN JOHN E ISLAS ADYACENTES-SANTA CRUZ-AGUAS CERCA DE LA COSTA DEL ATLANTICO Y AGUAS COSTERAS ADYACENTES DEL CARIBE- 1021 AM AST VIERNES 6 DE MAYO DE 2016 ESTA PERSPECTIVA SOBRE LAS CONDICIONES PELIGROSAS DEL TIEMPO ES PARA LAS ISLAS VIRGENES AMERICANAS Y LAS AGUAS COSTERAS ADYACENTES. .DIA UNO...HOY Y ESTA NOCHE .TRONADAS...EXISTE UNA POSIBILIDAD DE TRONADAS CON LLUVIAS FUERTES Y BREVE VIENTOS EN RAFAGAS ESTA TARDE A TRAVES DE PORCIONES DE SAN TOMAS. .VIENTOS...VIENTOS SOSTENIDOS EN EXCESO DE 20 MPH SE ESPERAN A TRAVES DEL EXTERIOR DE LAS AGUAS LOCALES DEL ATLANTICO. .OLAS/OLEAJE...OLEAJE PICADO/PELIGROSO DE HASTA 6 PIES SE ESPERAN A TRAVES DEL EXTERIOR DE LAS AGUAS LOCALES DEL ATLANTICO. .CORRIENTES SUBMARINAS...EXISTE UN RIESGO MODERADO DE CORRIENTES SUBMARINAS PARA SANTA CRUZ. .DIAS DOS HASTA SIETE...LUNES HASTA SABADO AGUACEROS Y TRONADAS AISLADAS AUMENTARAN ESTA NOCHE Y EXISTE UN RIESGO DE LLUVIAS FUERTES PRODUCIENDO INUNDACIONES DE CUNETAS. AGUACEROS TAMBIEN AUMENTARAN FINALES DE LA SEMANA. EL RIESGO MODERADO DE CORRIENTES SUBMARINAS CONTINUARA PARA LA MAYORIA DEL PERIODO EN SANTA CRUZ. .COMUNICADO SOBRE INFORMACION REPORTADA POR OBSERVADORES... NO SE ANTICIPA ACTIVACION AMPLIA DE OBSERVADORES...SIN EMBARGO...SE LES EXHORTA A LOS OBSERVADORES INDIVIDUALES A REPORTAR INUNDACIONES...TROMBAS MARINAS Y CORRIENTES SUBMARINAS AL SERVICIO NACIONAL DE METEOROLOGIA EN SAN JUAN.
The San Juan radar (TJUA), 117 km away, was scanning. The volume nearest the first event began at 21:46 UTC.
3 lightning, 1 thunderstorm wind. Local standard time, as filed.
Excessive lightning strikes were observed across Aguadilla municipality.
Excessive lightning reported over Mayaguez and vicinity.
Excessive lightning reported in Barceloneta and Surrounding municipalities.
Several uprooted trees reported in Vega Baja municipality.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2016Every state in 2016This day in weather historyWarnings in Puerto Rico, May 2016
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 640308, 640309, 640310, 640311.