The combination of an upper level trough with abundant low level moisture produced scattered showers over the eastern half of Puerto Rico.
Every event with a place to put it. Tap one for its entry below.
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The episode as NWS SJU wrote it up.
The combination of an upper level trough with abundant low level moisture produced scattered showers over the eastern half 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 30, 1:41 PM AST, 3 hours 34 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 141 PM AST MON MAY 30 2016 .SYNOPSIS...High pressure ridge north of the region and broad surface trough spread across the central and eastern caribbean...will maintain a moist southeasterly wind flow across the forecast area through most of the work week. High amplitude trough across the west Atlantic extending southwards into the Western Caribbean will hold through the end of the week. Meanwhile upper level ridge will remain positioned over the Northeastern Caribbean through the end of the week. The present overall pattern aloft will maintain a west southwest flow and diffluence aloft along with good ventilation for convective development most of the week. && .DISCUSSION...The combination of the upper trough just west of the region along with a significant moist environment...local and diurnal effects will continue to support rapid development of showers and thunderstorm activity across portions of the islands and coastal waters today and at least until Wednesday. Some of the showers and thunderstorms will continue to produce periods of locally heavy rainfall and gusty winds which will eventually lead to minor flooding of urban areas... rivers and small streams especially along portions of the northern half of Puerto Rico including parts of the San Juan metro area. The activity over land should taper off and diminish just after sunset leaving variably cloudy skies over land. Another round of showers an isolated thunderstorms will develop across the coastal waters during the late evening and overnight hours. The persistent southeasterly flow will steer these showers across portion of the east and south coastal sections of the islands during the morning hours. On Tuesday and possibly into Wednesday...expect showers and thunderstorm activity to quickly develop once again over the interior and west sections of Puerto Rico. This will again increase the potential for urban and small stream flooding mainly across Puerto Rico. One note of concern is that although there may be periods of lesser shower activity in some areas during the next few days...the soil remain very saturated across portions of the northern half and east sections of Puerto Rico. Some rivers and streams will continue to run just above their normal levels especially in parts of the east interior and west sections of Puerto Rico. Mudslides will also remain possible in areas of steep terrain. For this reason... residents...motorists and visitors in these areas should remain alert and continue to monitor for any statements and bulletins issued by the National Weather Service San Juan Puerto Rico. For the long term ...By the end of the work week model guidance suggest slight decrease in moisture transport and weakening of the ridge aloft...as the upper trough west of the region fills and a short wave trough moves just north of the area. Although lesser dynamics and upper level support is expected by then...they will still be sufficient low level moisture to allow daytime heating and local terrain effects to lead to afternoon convection each day. && .AVIATION...SHRA/-TSRA still possible across mainland PR thru 22z. Impacting mainly JSJ/JBQ/JMZ with at least periods of MVFR cigs. Mountain top obscd likely at el Yunque and the Cordillera Central of PR. Tops around Fl250-300 will continue over the waters between the USVI and eastern PR terminals during the overnight hours...creating mainly VCSH but -RA over the terminals at times. Low level winds will continue ESE around 10-15 knots...but sfc winds will be light and variable overnight. && .MARINE...Seas expected to remain below 4 feet and southeast winds will continue between 10-15 knots. However higher wind gusts can be expected near enhanced shower and thunderstorm activity which is expected to continue overnight through Tuesday. Dangerous lightning strikes will also be likely with thunderstorms that develop over the coastal waters surrounding Puerto Rico and the U.S Virgin Islands. && .PRELIMINARY POINT TEMPS/POPS... SJU 77 87 78 89 / 30 40 40 40 STT 80 87 81 86 / 50 50 50 50 && .SJU Watches/Warnings/Advisories... PR...None. VI...None. AM...None. && 13/09
FLCA42 TJSJ DDHHMM HWOSPN PERSPECTIVAS SOBRE CONDICIONES PELIGROSAS DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 719 AM AST LUNES 30 DE MAYO DE 2016 AMZ710>745-PRZ001>013-302330- 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- 719 AM AST LUNES 30 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 PROBABILIDAD DE TRONADAS CON LLUVIA FUERTE... VIENTOS BREVES EN RAFAGAS Y RAYOS FRECUENTES A TRAVES DE LAS AGUAS LOCALES Y LA CORDILLERA CENTRAL DE PUERTO RICO...ESPECIALMENTE SOBRE EL AREA DEL YUNQUE Y SECTORES DEL INTERIOR Y OESTE DE LA ISLA. .INUNDACIONES...LLUVIAS FUERTES PUDIERAN RESULTAR EN INUNDACIONES URBANAS Y DE RIACHUELOS. TAMBIEN...DEBIDO A LOS SUELOS YA SATURADOS...DESLIZAMIENTOS E INUNDACIONES REPENTINAS SON POSIBLES EN AREAS DE TERRENO EMPINADO Y A LO LARGO DE RIOS PRINCIPALES Y SUS TRIBUTARIOS DEL ESTE DE PUERTO RICO ESTA TARDE. EN ADICION...AGUACEROS Y TRONADAS A TRAVES DEL OESTE DE PUERTO RICO PODRAN CONDUCIR A UN AUMENTO EN LOS NIVELES DE AGUA A LO LARGO DEL RIO CULEBRINA Y SUS TRIBUTARIOS. .CORRIENTES SUBMARINAS...EXISTE UN RIESGO MODERADO DE CORRIENTES SUBMARINAS PARA ALGUNAS PLAYAS A LO LARGO DEL NORTE DE PUERTO RICO. .DIAS DOS HASTA SIETE...MARTES A DOMINGO EL POTENCIAL DE INUNDACIONES URBANAS Y DE RIACHUELOS PERMANECE ALTA POR LOS PROXIMOS DIAS A TRAVES DE PUERTO RICO...YA QUE SE ESPERAN AGUACEROS Y TRONADAS CADA DIA. UN RIESGO MODERADO DE CORRIENTES SUBMARINAS CONTINUARA DURANTE LA MAYOR PARTE DE LA SEMANA LABORAL A TRAVES DE LAS PLAYAS ORIENTADAS HACIA EL NORTE Y ESTE DE LAS ISLAS. .COMUNICADO SOBRE INFORMACION REPORTADA POR OBSERVADORES... NO SE ANTICIPA ACTIVACION AMPLIA DE OBSERVADORES...SIN EMBARGO...SE LES EXHORTA A LOS OBSERVADORES INDIVIDUALES A REPORTAR TEMPERATURAS ALTAS...VIENTOS FUERTES...INUNDACIONES Y CORRIENTES SUBMARINAS AL SERVICIO NACIONAL DE METEOROLOGIA EN SAN JUAN. AMZ715-725-VIZ001-002-302330- SAN TOMAS SAN JOHN E ISLAS ADYACENTES-SANTA CRUZ- AGUAS CERCA DE LA COSTA DEL ATLANTICO Y AGUAS COSTERAS ADYACENTES DEL CARIBE- 719 AM AST LUNES 30 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 PROBABILIDAD DE TRONADAS CON LLUVIA FUERTE... VIENTOS BREVES EN RAFAGAS Y RAYOS FRECUENTES A TRAVES DE LAS ISLAS VIRGENES AMERICANAS Y AGUAS CERCANAS. .DIAS DOS HASTA SIETE...MARTES A DOMINGO EL POTENCIAL DE INUNDACIONES URBANAS Y DE CUNETAS AUMENTARA EL MARTES A MEDIDA QUE LA HUMEDAD AUMENTE A TRAVES DE LA REGION .COMUNICADO SOBRE INFORMACION REPORTADA POR OBSERVADORES... NO SE ANTICIPA ACTIVACION AMPLIA DE OBSERVADORES...SIN EMBARGO...SE LES EXHORTA A LOS OBSERVADORES INDIVIDUALES A REPORTAR TEMPERATURAS ALTAS...VIENTOS FUERTES...INUNDACIONES Y CORRIENTES SUBMARINAS AL SERVICIO NACIONAL DE METEOROLOGIA EN SAN JUAN.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
1231 PM AST MON MAY 30 2016
PRZ005-008-301715-
NORTH CENTRAL-NORTHWEST-
1231 PM AST MON MAY 30 2016
...A STRONG THUNDERSTORM WILL AFFECT CAMUY...ISABELA...
QUEBRADILLAS...AGUADILLA...ARECIBO...HATILLO AND MOCA
MUNICIPALITIES...
AT 1229 PM AST...A STRONG THUNDERSTORM WAS LOCATED OVER
CAMUY...MOVING NORTHWEST NEAR 20 MPH. SIMILAR THUNDERSTORMS ARE
DEVELOPING ALONG THE NORTH COAST OF PUERTO RICO FROM ARECIBO TO
ISABELA.
WINDS IN EXCESS OF 30 MPH ARE POSSIBLE WITH THIS STORM.
LOCATIONS IMPACTED INCLUDE...
ARECIBO...CAMUY...ISABELA...HATILLO...QUEBRADILLAS AND AGUADILLA.
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.
LAT...LON 1851 6702 1849 6698 1848 6692 1850 6680
1847 6674 1847 6670 1848 6668 1844 6663
1836 6670 1844 6705 1846 6706 1845 6708
1847 6717 1848 6717 1850 6714 1852 6710
TIME...MOT...LOC 1629Z 122DEG 16KT 1847 6686
DSCOMUNICADO ESPECIAL SOBRE LAS CONDICIONES DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 1231 PM AST LUNES 30 DE MAYO DE 2016 PRZ005-008-301715- CENTRAL NORTE-NOROESTE- 1231 PM AST LUNES 30 DE MAYO DE 2016 ...UNA TRONADA FUERTE AFECTARA LOS MUNICIPIOS DE CAMUY...ISABELA... QUEBRADILLAS...AGUADILLA...ARECIBO...HATILLO Y MOCA. A LAS 12:29 PM AST...UNA TRONADA FUERTE ESTUVO LOCALIZADA SOBRECAMIU...MOVIENDOSE HACIA EL NOROESTE CERCA DE 20 MPH. TRONADAS SIMILARES SE ESTAN DESARROLLANDO A LO LARGO DE LA COSTA NORTE DE PUERTO RICO DESDE ARECIBO HASTA ISABELA. LAS LOCALIDADES IMPACTADAS INCLUYEN...ARECIBO...CAMUY...ISABELA... HATILLO...QUEBRADILLAS Y AGUADILLA. VIENTOS EN EXCESO DE 30 MPH SON POSIBLES COMO PARTE DE ESTA ACTIVIDAD. RAYOS FRECUENTES ESTAN OCURRIENDO COMO PARTE DE ESTA ACTIVIDAD. RAYOS PUEDEN CAER A 10 MILLAS DE DISTANCIA DE UNA TRONADA. REFUGIESE DENTRO DE UN EDIFICIO O VEHICULO. DS/ICP
The San Juan radar (TJUA), 39 km away, was scanning. The volume nearest the first event began at 21:13 UTC.
1 flash flood. Local standard time, as filed.
Impassable roads were reported along route PR-31 near exit 22 and some parts of route PR-3 near Rio Blanco.
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: 640321.