Low level moisture combined with daytime heating and a southeast wind flow produced scattered showers with thunderstorms over some areas in Puerto Rico.
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The episode as NWS SJU wrote it up.
Low level moisture combined with daytime heating and a southeast wind flow produced scattered showers with thunderstorms over some areas in 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 13, 10:20 AM AST, 3 hours 25 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 1020 AM AST FRI MAY 13 2016 .UPDATE... Fair weather conditions prevailed this morning with only brief shallow showers affecting the eastern portions of Puerto Rico and the US Virgin Islands. Light to moderate showers also affected the surrounding waters. Based on the 13/12Z sounding...surface winds prevail from the east southeast with a west southwesterly wind flow aloft with a slightly higher level of surface moisture. Therefore...Showers and thunderstorms are still expected to develop across portions of PR and the USVI throughout the afternoon hours. The heaviest showers should be focused over the interior...north and northwest portions of PR. .AVIATION...Mainly VCSH and periods of -RA expected at TNCM/TKPK and the USVI/Eastern PR terminals thru the rest of the morning hrs. SHRA/TSRA expected this aft over the islands. Therefore...Mtn obscuration pos across interior PR as SHRA/TSRA develops over the interior/nw sections. MVFR conds pos at TJSJ/TJBQ/TJMZ from 18z- 22z. Low level winds will continue from the E-ESE at 10-15 kt with sea breeze variations. .MARINE...Hazardous marine conditions possible across the coastal waters near showers and thunderstorms. No change to the rest of the previous forecast. && .PREV DISCUSSION... /issued 448 AM AST FRI MAY 13 2016/ SYNOPSIS...At upper levels...a high pressure ridge east of the Lesser Antilles is inducing a west-southwest flow aloft. A mid level ridge is forecast to develop and expand westward over the Eastern Caribbean during the weekend. At low levels...weak high pressure north of the local region will merge with another high pressure over the Central Atlantic over the next few days. This surface high pressure will remain near stationary as builds over the Central Atlantic...resulting in breezy conditions across the islands Tuesday and Wednesday. DISCUSSION...Plenty of moisture remains across the forecast area today. Precipitable Water Analysis from CIMSS indicated deep moisture just upstream of the local islands. This high moisture content will keep the atmosphere fairly unstable especially at low to mid levels. As a result...showers and thunderstorms will likely develop across portions of PR and the USVI throughout the day. The heaviest showers are expected over the interior...north and northwest PR as a moderate southeasterly flow prevails below 700 MB. Although...moisture will remain higher than normal through sunday... no synoptic forcing will be presented to support organized convection. A mid level ridge will dominate the Eastern Caribbean Basin. Therefore...partly cloudy to mostly cloudy skies with scattered showers are likely during the weekend. A drier and more stable air mass is forecast to encompass the local area between monday and wednesday...reducing the coverage of showers across the forecast area. Then...an upper level trough will amplify over the Northeast Caribbean Region Thursday and Friday...increasing again the potential of showers and thunderstorms across the local islands. AVIATION...SHRA and TSRA will continue over the waters thru the fcst period. Mainly -RA/RA can briefly affect TNCM/TKPK and the USVI/Eastern PR terminals thru the morning hours. Mtn top obscd across E PR will likely continue thru this afternoon...spreading across the rest of mainland PR as SHRA/TSRA develops over the interior/nw sections. MVFR to brief IFR conds possible at TJSJ/TJBQ/TJMZ from 18z-22z. Low level winds will continue from the E-ESE at 10-15 kt with sea breeze variations aft 13z. MARINE...A small Northeast swell of around 4 feet will invade the local waters later today. This swell will help to maintain the seas around 3-5 feet across most of the waters. Moderate winds will continue through monday...increasing to locally fresh between tuesday and friday. && .PRELIMINARY POINT TEMPS/POPS... SJU 88 77 89 77 / 50 40 40 20 STT 87 78 86 78 / 40 40 40 50 && .SJU Watches/Warnings/Advisories... PR...None. VI...None. AM...None. && 05/72
PERSPECTIVAS SOBRE CONDICIONES PELIGROSAS DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 511 AM AST VIERNES 13 DE MAYO DE 2016 AMZ710>745-PRZ001>013-140915- 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- 511 AM AST VIERNES 13 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 BREVES VIENTOS EN RAFAGAS ESTA TARDE A TRAVES DE SECTORES DEL CUADRANTE INTERIOR...NORTE Y NOROESTE DE LA ISLA...INCLUYEND EL AREA METROPOLITANA DE SAN JUAN. .INUNDACIONES...LLUVIAS FUERTES PUDIERAN RESULTAR EN INUNDACIONES URBANAS Y DE RIACHUELOS. .VIENTOS...VIENTOS SOSTENIDOS DE HASTA 20 MPH PODRAN ESPERARSE A TRAVES DE LAS AGUAS DEL ATLANTICO. .CORRIENTES SUBMARINAS...EXISTE UN RIESGO MODERADO DE CORRIENTES SUBMARINAS PARA EL NORTE DE PUERTO RICO. .DIAS DOS HASTA SIETE...SABADO A JUEVES SE ESPERAN INUNDACIONES URBANAS LOCALIZADAS Y DE RIACHUELOS MAYORMENTE HACIA EL NORTE DE LA CORDILLERA CENTRAL DURANTE LAS TARDES. EL RIESGO MODERADO DE CORRIENTES SUBMARINAS PROBABLEMENTE CONTINUARA DURANTE LOS PROXIMOS DIAS. .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-VIZ001-002-140915- SAN TOMAS SAN JOHN E ISLAS ADYACENTES-SANTA CRUZ-AGUAS CERCA DE LA COSTA DEL ATLANTICO Y AGUAS COSTERAS ADYACENTES DEL CARIBE- 511 AM AST VIERNES 13 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 .CORRIENTES SUBMARINAS...EXISTE UN RIESGO MODERADO DE CORRIENTES SUBMARINAS PARA SANTA CRUZ Y EL NOROESTE DE SAN TOMAS. .DIAS DOS HASTA SIETE...SABADO A JUEVES INUNDACIONES URBANAS Y DESBORDAMIENTO DE CUNETAS SON POSIBLES COMENZANDO EL SABADO. EL RIESGO MODERADO DE CORRIENTES SUBMARINAS CONTINUARA DURANTE LOS PROXIMOS DIAS. .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 national radar mosaic for the moment the first event began.
1 flood, 1 heavy rain. Local standard time, as filed.
Antartica street was reported flooded in Puerto Nuevo sector.
A fallen tree over electric lines was reported at road PR-446, KM 2.0 in Barrio Robles.
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: 640317, 640318.