Low-level moisture combined with daytime heating and local effects to generate showers and thunderstorms across portions of interior and southwest PR.
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.
Low-level moisture combined with daytime heating and local effects to generate showers and thunderstorms across portions of interior and southwest PR.
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 Aug 10, 3:56 PM AST, 34 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 356 PM AST Thu Aug 10 2017 .SYNOPSIS... A surge of moisture associated with an approaching tropical wave is moving from the northeast over the islands. This westward moving tropical wave in tandem with a TUTT low will reach the region tonight and overnight. A southerly wind flow is expected to establish across the region Friday and Saturday. A surface perturbation with a surge of moisture is forecast to move near the islands by Sunday. Another tropical waves is expected by late Monday night or Tuesday. && .SHORT TERM... Under a northeasterly wind flow and the proximity of a tropical wave interacting with a TUTT-Low, afternoon convection is expected to be confined across the Cordillera Central and the southwest quadrant of Puerto Rico. Also patches of clouds and showers will move from time to time across the northern U.S. Virgin Islands and north and east sections of Puerto Rico. Although the tropical wave splits in two, with the bulk of moisture to the north of the region, the trailing moisture of the tropical wave along with the relocation of the Tutt low north of the region will be sufficient to increase the chance for shower and thunderstorm development across the region beginning late tonight and continuing through at least Friday. Winds are forecast to shift from the east-southeast by Friday and Saturday creating favorable conditions for warmer temperatures. THere is a good chance to have fair weather conditions during the upcoming weekend. However, under this wind flow afternoon convection is expected to develop over the interior and northwest quadrant each day. On the other hand, the U.S. Virgin Islands can expect mostly sunny to partly cloudy skies with overnight/morning trade wind showers at times. LONG TERM...Sunday through Wednesday After the wave passage of Friday and Saturday, threads and patches of moisture rotate through the area Sunday and Monday. A tropical wave is expected Monday night into Tuesday to increase the shower and thunderstorm activity then a large area of dry air from mid levels all the way to just below the 850 mb level will drag through. Although some moisture will be seen south of the area this will likely be the time of least showers during the next 7 days. Although TUTT lows will migrate across the Atlantic waters just north of the forecast area, they are weak and will have very little effect on the passing waves. This will leave only the moderate to fresh trade winds modulated by the passing of the tropical waves carrying scattered showers and isolated thunderstorms in the typical diurnal pattern. && .AVIATION... VFR cond across the local flying except for aftn SHRA/Psbl TSRA ovr ctrl Mtn range of PR TIL 10/22Z and SHRA/-SHRA ovr coastal waters and along N coastal areas of PR and Nrn USVI. No sig operations wx impacts attm. Prevailing E-NE winds of 15-20 kts to prevail blo FL250,,,Sfc wnds 10-15 kts with ocnl higher gusts...then bcmg 5-10 kts aft 10/22z. && .MARINE... Local buoys continued to indicate winds around 15 knots and seas at less than 5 feet and will remain below SCA criteria through the upcoming weekend. Model guidance suggest increasing seas and winds by the upcoming week as another tropical wave move by the islands on Monday or Tuesday. && .PRELIMINARY POINT TEMPS/POPS... SJU 90 79 92 79 / 30 30 30 30 STT 92 80 88 81 / 30 30 50 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...CAM LONG TERM....Previous Discussion AVIATION...RAM
Perspectivas sobre condiciones peligrosas del tiempo Servicio Nacional de Meteorologia San Juan PR 455 AM AST jueves 10 de agosto de 2017 AMZ710>745-PRZ001>013-110900- 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 lejanas a la costa del Atlantico y Caribe- 455 AM AST jueves 10 de agosto 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 la probabilidad de tronadas con lluvias fuertes y vientos en rafaga breves esta tarde a traves de porciones del oeste y suroeste de Puerto Rico. .Viento...Vientos sostenidos en exceso de 20 mph son posibles a traves de sectores de las aguas del Caribe y oeste. .Oleaje...Se espera oleaje picado de hasta 6 pies a traves de las aguas lejanas a la costa del Atlantico. .Corrientes marinas...Existe un riesgo moderado de corrientes marinas para gran parte de la costa norte y porciones de la costa sureste de Puerto Rico al igual que para la mayoria de las playas de Vieques y Culebra. .Calor...Se esperan indices de calor de 102 a 107 grados a lo largo de la costa norte central y noreste de Puerto Rico al igual que a lo largo de algunas areas de Vieques y Culebra. .Dias dos a siete...viernes a miercoles Un riesgo moderado de corrientes marinas continuara hasta por lo menos el sabado. Se espera que los indices de calor aumenten sobre 102 grados cada dia en algunas areas costeras y otras areas bajas. Una onda tropical traera un buen potencial de tronadas a traves de algunas porciones de Puerto Rico el viernes y sabado. Inundaciones urbanas y de riachuelos podran ocurrir con estas tronadas ambos dias. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores, sin embargo, se exhorta a los observados a corrientes marinas a la oficina del Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-110900- San Tomas, San John e Islas Adyacentes-Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 455 AM AST jueves 10 de agosto 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 .Olas...Se espera oleaje picado de hasta 6 pies a traves de las aguas lejanas a la costa del Atlantico. .Corrientes marinas...Existe un riesgo moderado de corrientes marinas para algunas playas de Santa Cruz. .Calor...Se esperan indices de calor de 102 a 107 grados a traves de las islas locales. .Dias dos a siete...viernes a miercoles Un riesgo moderado de corrientes marinas continuara hasta por lo menos el sabado. Se espera que los indices de calor aumenten sobre 102 grados cada dia en areas bajas. Una onda tropical traera un buen potencial de tronadas a traves de las islas locales el viernes y sabado. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores, sin embargo, se exhorta a los observados a corrientes marinas a la oficina del Servicio Nacional de Meteorologia en San Juan.
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
ROADS PR-309 AND PR-114 were reported impassable in the Urbanization Valle Hermoso.
One lane along PR-2 was reported impassable between Mayaguez Mall and Road PR-100.
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, August 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: 718919, 718922.