The moisture associated with a tropical wave interacted with local and diurnal effects to produce a line of heavy showers and thunderstorms downstream from El Yunque, affecting the San Juan metro area.
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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.
The moisture associated with a tropical wave interacted with local and diurnal effects to produce a line of heavy showers and thunderstorms downstream from El Yunque, affecting the San Juan metro area.
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 Jul 22, 3:08 PM AST, 1 hour 12 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 308 PM AST Sat Jul 22 2017 .SYNOPSIS...A tropical wave with good moisture will move through the area early tonight followed by drier air Sunday and Monday. Moisture wrapping around a high pressure will reach the area on Tuesday. A second tropical wave will follow on Thursday and better moisture will follow it. Moisture tapers off slightly over the following weekend. && .SHORT TERM...Tonight through Tuesday Winds shifted shortly after noon from a prevailing northeast flow to an east southeast flow suggesting that the tropical wave or a weaker trough may have passed through the area. The MIMIC product shows the best moisture hanging back at about 61.5 degrees west as of 22/13Z and present calculations suggest that it should cross Saint Thomas at 23/05Z and San Juan at about 23/09Z--or earlier, since there are indications that it is accelerating somewhat. Currently tops have exceeded 50kft in western Puerto Rico, but convection has been weaker in eastern Puerto Rico. Better rainfall is expected overnight but it will likely be confined to the southeast third of Puerto Rico with scattered showers around the U.S. Virgin Islands. With east to east southeast flow and a definite drop in columnar moisture the first half of Sunday, maximum temperatures should again broach the 90s on most of the north coast. Limited moisture to counteract this heating on the south coast may also allow high temperatures to resist the sea breezes and be predominantly in the lower 90s. Monday will continue this trend. Early Tuesday morning moisture arrives from the northeast that had traveled around a high pressure north of the area and by Tuesday afternoon precipitable water will be close to 2 inches again. This will begin a wetter trend. .LONG TERM...Wednesday through Saturday Areas of moisture with a few dry slots move through the area through Saturday on mostly easterly low level flow that will sustain our seasonal summer pattern of showers and thunderstorms each day. First around the U.S. Virgin Islands in the early mornings and into eastern Puerto Rico, and then in the western and interior portions of the Puerto Rico during the afternoons. No strong features are currently seen in the models through the end of July, but seasonal showers and thunderstorms often do produce urban and small stream flooding in the afternoons. && .AVIATION...SHRA/TSRA expected to continue over PR this afternoon until around 22/22Z. This will cause VCSH or VCTS near the terminals in PR. VCSH is expected for the remaining local terminals as SHRA move in with the tropical wave that is bringing plenty of moisture. Winds will continue from the east at about 10-15KT with higher gusts this afternoon, then decrease overnight to around 10KT. Overnight weather will likely cause VCSH across the local terminals except for TJMZ Limited MVFR and mtn obscurations will likely continue through at least 23/16Z. Winds alf easterly 10-20 kt up thru FL320 becmg easterly at all levels by 24/00z. Winds strongest blo FL100. && .MARINE...Seasonally tranquil seas of 5 feet or less are expected in most of the local waters through the end of July. Small craft advisories are not expected to be issued this month under the current forecast. But winds up to 20 knots are possible in exposed waters and small craft will need to exercise caution. && .PRELIMINARY POINT TEMPS/POPS... SJU 79 90 81 90 / 40 50 20 20 STT 80 89 81 90 / 60 60 20 20 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...JA LONG TERM....WS
Perspectivas sobre condiciones peligrosas del tiempo Servicio Nacional de Meteorologia San Juan PR 510 AM AST sabado 22 de julio de 2017 AMZ710>745-PRZ001>013-230915- 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- 510 AM AST sabado 22 de julio 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 un potencial de tronadas con fuertes lluvias y vientos en rafagas breves esta tarde, particularmente a traves de sectores del interior y oeste de Puerto Rico. .Inundaciones...Fuerte lluvias pudieran resultar en inundaciones urbanas y de riachuelos. .Olas...Se espera oleaje picado de 4 a 6 pies con oleaje ocasional de hasta 8 pies a traves de las aguas lejanas a la costa del Atlantico. .Corrientes Marinas...Existe un riesgo moderado de corrientes marinas a lo largo de las playas del norte de Puerto Rico, al igual que playas del sureste de Puerto Rico y Vieques. .Dias dos a siete...domingo a viernes A medida que una onda tropical se mueva a traves del este del Caribe, existe un potencial de aguaceros y tronadas, al igual que inundaciones urbanas y de riachuelos hasta el domingo en la tarde. Un riesgo moderado de corrientes marinas continuara a lo largo de las playas del norte de Puerto Rico. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores, sin embargo, se exhorta a los observados a reportar inundaciones y corrientes marinas a la oficina del Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-230915- San Tomas, San John e islas adyacentes-Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 510 AM AST sabado 22 de julio 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 4 a 6 pies con oleaje ocasional de hasta 8 pies a traves de las aguas lejanas a la costa del Atlantico. .Corrientes Marinas...Existe un riesgo moderado de corrientes marinas para las playas de Santa Cruz. .Dias dos a siete...domingo a viernes A medida que una onda tropical se mueva a traves del este del Caribe, existe un potencial de aguaceros y tronadas, al igual que inundaciones urbanas y de riachuelos hasta el domingo en la tarde. Un riesgo moderado de corrientes marinas continuara a traves de Santa Cruz. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores, sin embargo, se exhorta a los observados a reportar inundaciones y corrientes marinas a la oficina del Servicio Nacional de Meteorologia en San Juan.
The San Juan radar (TJUA), 32 km away, was scanning. The volume nearest the first event began at 20:19 UTC.
2 flash flood, 1 heavy rain. Local standard time, as filed.
Flooding was reported at the San Patricio Exit in Expreso Martinez Nadal.
Road PR-19 was reported flooded as a result of the Margarita stream going out of its banks.
Mudslide was reported in Camino Los Romeros street in Barrio Caimito.
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, July 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: 715882, 715883, 715884.