A moist southeast wind flow combined with daytime heating and local effects to produce scattered to numerous showers across the southern slopes of Puerto Rico.
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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.
A moist southeast wind flow combined with daytime heating and local effects to produce scattered to numerous showers across the southern slopes 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 Mar 29, 4:10 PM AST, 2 hours 5 minutes earlier.
Area Forecast Discussion...CORRECTED National Weather Service San Juan PR 410 PM AST Wed Mar 29 2017 .SYNOPSIS...Shower and thunder development still possible across the eastern interior and southern slopes through the early evening hours. A generally fair weather pattern will prevail Thu and Fri with some locally induced afternoon showers across west and southwest Puerto Rico. Moisture advection is expected the upcoming weekend. && .SHORT TERM...Tonight through Sat Morning... Shower and thunder development still possible through the early evening hours across the eastern interior and southern slopes of Puerto Rico. With the heaviest showers ponding of water on roadways and in low lying areas is expected with some rises along small stream and rivers. As a surface low across the north central Atlantic moves east northeast, a surface high will build north of the area. Therefore low level winds are expected to become more east northeast Friday and east to east southeast late Saturday and into Sunday. At upper levels, a mid level ridge will build from the west and hold much of the upcoming week. Precipitable water will continue to erode under the prevailing northerly winds. As the low level winds becomes easterly to east southeast the upcoming weekend, moisture is expected to advect once again across the forecast area. Therefore, tonight through Friday mainly fair weather conditions are expected to prevail with a few locally induced showers across the west and southwest Puerto Rico. As the moisture increases the upcoming weekend, the chance for showers will increase, although under a building ridge there will be hostile environment for thunderstorm development. As a result, expect passing showers across the USVI and E PR Saturday morning with showers developing over and west of the Cordillera Saturday afternoon. .LONG TERM...Sat thru Wed/issued 353 AM AST Wed Mar 29 2017/ A weak surface high pressure is expected to develop across the central Atlantic early in the weekend to maintain an easterly trade wind flow across the local islands Saturday and Sunday. At the same time a surface low emerging across the northeastern United States seaboard will push the surface high eastward while weakening. As this happens patches of moisture associated with a frontal remnants will combine with local effects both days to produce an increase in cloudiness and shower activity across Puerto Rico and the U.S. Virgin Islands during the weekend, but at this time not widespread or significant precipitation is expected during this period. As the aforementioned surface low and associated frontal boundary moves northeastward toward the north central Atlantic, another stronger surface high is expected to develop and drift across the western Atlantic. This feature will bring an east northeast trade wind flow across the forecast area late Monday through at least Wednesday. An upper level ridge is expected to build and strengthening over the northeast Caribbean during the weekend and is expected to persist over the region through at least Wednesday. This feature will inhibit the development of widespread or deep convection across the local islands during the forecast period, but moisture embedded in the trades will continue to combine with local effects to produce some shower activity across western and interior Puerto Rico each day. && .AVIATION...Mostly VFR conds expected to prevail at all TAF sites through the forecast period. VCTS expected at JPS/JSJ through 29/22z. Light northerly winds tonight and overnight becoming more easterly by tomorrow. && .MARINE...Tranquil marine weather conditions will persist tonight with seas below 5 feet and northerly winds at less than 15 knots. A northerly swell is expected to reach the islands by Thursday. Therefore the risk of rip currents is expected to increase along the north facing beaches of PR and the USVI. && .PRELIMINARY POINT TEMPS/POPS... SJU 75 84 74 84 / 30 30 20 20 STT 74 85 73 85 / 30 30 20 20 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...OMS AVIATION...CAM
Perspectivas sobre condiciones peligrosas del tiempo Servicio Nacional de Meteorologia San Juan PR 1251 PM AST miercoles 29 de marzo de 2017 AMZ710>745-PRZ001>013-300500- San Juan y Vecindad-Noreste-Sureste-Este Interior- Norte Central-Interior Central-Ponce y Vecindad-Noroeste- Oeste Interior-Mayaguez y Vecindad-Suroeste-Culebra-Vieques- Aguas cercanas y aguas mar afuera del Atlantico y aguas costeras del Caribe- 1251 PM AST miercoles 29 de marzo de 2017 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 lo largo y al sur de la Cordillera Central. .Inundaciones...Lluvias fuertes pudieran resultar en acumulacion de agua en las carreteras y en areas de pobre drenaje, al igual que inundaciones urbanas y de riachuelos pequenos mayormente a traves del interior este. .Corrientes submarinas...Existe un riesgo moderado de corrientes marinas a traves de la mayoria de las playas locales. .Dias dos a siete...jueves a martes Un riesgo moderado de corrientes submarinas continuara prevaleciendo a traves de la mayoria de las playas loacales durante los proximos dias. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo se les exhorta a observadores a reportar corrientes submarians e inundaciones al Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-300500- San Tomas, San John e islas adyacentes- Santa Cruz-Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 1251 PM AST miercoles 29 de marzo de 2017 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 .Corrientes submarinas...Existe un riesgo bajo de corrientes submarinas a traves de las playas locales de todas las islas. .Dias dos a siete...jueves a martes Un riesgo moderado de corrientes submarinas se espera a traves de algunas areas durante los proximos dias. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo se les exhorta a observadores a reportar corrientes submarians al Servicio Nacional de Meteorologia en San Juan.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Heavy rainfall and runoff across portions of northern Coamo caused Rio Coamo to flood portions of road PR-14 near the downtown area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2017Every state in 2017This day in weather historyWarnings in Puerto Rico, March 2017
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: 681251.