A low-level trough moved across the region. This feature produced heavy showers across eastern Puerto Rico.
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The episode as NWS SJU wrote it up.
A low-level trough moved across the region. This feature produced heavy showers across eastern Puerto Rico. As a result, Rio Garona was reported out of its banks, at Barrio Tumbao in Maunabo.
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 Dec 2, 3:50 AM AST, 2 hours 42 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 350 AM AST Fri Dec 2 2016 .SYNOPSIS...SURFACE High spread across the west central atlantic And broad inverted trough extending northwards across the region Will maintain light to moderate east southeast trade winds across The area during today through saturday. The surface trough will continue to weaken today through saturday as the atlantic ridge spreads eastward and builds north of the region. Mid to upper level high pressure ridge will continue extend northwards across the region through the upcoming weekend. && .DISCUSSION... Showers and accompanying patches of shallow low level moisture Embedded in the trade wind flow will continue to affect the coastal Waters and mainly the east and south coastal areas of the islands During the rest of the morning hours. Mostly sunny to partly cloudy Skies expected by late morning followed by the chance of diurnally And locally induced afternoon showers. The shower activity should be focused across the central interior and northwest sections of PR as well as in portions of the San Juan metro area. Only isolated showers expected elsewhere including the USVI where no significant rainfall accumulations is expected at this time. In addition, because of the prevailing SE wind flow today, afternoon high temperatures across the San Juan metro and north PR may once again rise into the upper 80s while the rest of PR and the USVI should observe near normal temperatures in the low to mid 80s. Surface winds are to become more easterly and low level moisture transport will continue to gradually diminish over much of the weekend. However on Saturday model guidance still suggest a weak perturbation will bring a quick surge of moisture across the area. This will support early morning showers across the north and east sections of The islands. During the afternoon, shower development should be focused mainly over the interior and west sections of PR with limited shower activity elsewhere. On sunday and into early next week the upper ridge is to erode and prevailing winds are to become more northeasterly while increasing once again, as another area of high pressure will build across the Western Atlantic. This prevailing moderate northeast wind flow will increase the chance early morning cloudiness and quick passing showers along the north and east coastal section of the islands. && .AVIATION...SHRA/-shra expected across the local waters, some of Them will affect tjps/tist/tisx/tncm/tkpk overnight. However, vfr Conditions are expected during this period. Cloudiness is expected To increase after 02/16z over the interior/nw pr as well as downwind From el yunque, with shra/+shra impacting tjmz/tjbq, as well as vcsh At tjsj until 02/22z. Surface winds are expected to continue mainly From the ese at around 5 kt but locally higher in/near showers, Increasing at 10 to 15 kt after 02/13z with sea breeze variations. && .MARINE...SEAS will continue to subside during the rest of today. However small craft operators should exercise caution due to seas up To 6 feet across the Mona Passage. && .PRELIMINARY POINT TEMPS/POPS... SJU 89 76 89 76 / 20 30 30 20 STT 85 77 85 75 / 20 30 30 20 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && 27/09
PERSPECTIVAS SOBRE CONDICIONES PELIGROSAS DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 523 AM AST VIERNES 2 DE DICIEMBRE DE 2016 AMZ710>745-PRZ001>013-030930- SAN JUAN Y VECINDAD-NORESTE-SURESTE- ESTE INTERIOR-NORTE CENTRAL-CENTRAL INTERIOR-PONCE Y VECINDAD- NOROESTE-OESTE INTERIOR-MAYAGUEZ Y VECINDAD-SUROESTE-CULEBRA-VIEQUES- AGUAS COSTERAS Y MAR AFUERA DEL ATLANTICO Y DEL CARIBE- 523 AM AST VIERNES 2 DE DICIEMBRE DE 2016 ESTA PERSPECTIVA SOBRE LAS CONDICIONES DEL TIEMPO PELIGROSAS ES PARA PUERTO RICO Y LAS AGUAS COSTERAS ADYACENTES DEL ATLANTICO. .DIA UNO...HOY Y ESTA NOCHE .OLAS...SE ESPERA OLEAJE PICADO DE HASTA 6 PIES A TRAVES DEL PASAJE DE LA MONA. .CORRIENTES SUBMARINAS...EXISTE RIESGO MODERADO DE CORRIENTES SUBMARINAS PARA ALGUNAS DE LAS PLAYAS DEL NORTE, OESTE Y SUROESTE DE PUERTO RICO AL IGUAL QUE CULEBRA. .DIAS DOS HASTA SIETE...SABADO A JUEVES NO SE ANTICIPAN IMPACTOS DE TIEMPO SIGNIFICATIVO EN ESTOS MOMENTOS... EXCEPTO POR UN RIESGO MODERADO DE CORRIENTES SUBMARINAS DURANTE LOS PROXIMOS DIAS. .COMUNICADO SOBRE INFORMACION REPORTADA POR OBSERVADORES... NO SE ANTICIPA ACTIVACION AMPLIA DE OBSERVADORES. AMZ715-725-VIZ001-002-030930- SAN TOMAS SAN JOHN E ISLAS ADYACENTES-SANTA CRUZ- AGUAS CERCA DE LA COSTA DEL ATLANTICO Y AGUAS COSTERAS ADYACENTES DEL CARIBE- 523 AM AST VIERNES 2 DE DICIEMBRE DE 2016 ESTA PERSPECTIVA SOBRE LAS CONDICIONES PELIGROSAS DEL TIEMPO ES PARA LAS ISLAS VIRGENES AMERICANAS Y LAS AGUAS COSTERAS ADYACENTES. .DIA UNO...ESTA NOCHE .OLAS...SE ESPERA OLEAJE PICADO DE HASTA 6 PIES A TRAVES DEL PASAJE DE LA MONA. .CORRIENTES SUBMARINAS...EXISTE UN RIESGO MODERADO DE CORRIENTES SUBMARINAS A TRAVES DE ALGUNAS PLAYAS EN SAN TOMAS Y SANTA CRUZ. .DIAS DOS HASTA SIETE...SABADO A JUEVES NO SE ANTICIPAN IMPACTOS DE TIEMPO SIGNIFICATIVO EN ESTOS MOMENTOS... EXCEPTO POR UN RIESGO MODERADO DE CORRIENTES SUBMARINAS DURANTE LOS PROXIMOS DIAS. .COMUNICADO SOBRE INFORMACION REPORTADA POR OBSERVADORES... NO SE ANTICIPA ACTIVACION AMPLIA DE OBSERVADORES.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
A low-level trough moved across the region. This feature produced heavy showers across eastern Puerto Rico. As a result, Rio Garona was reported out of its banks, at Barrio Tumbao in Maunabo.
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, December 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: 671895.