A tropical wave moving across the area, combined with daytime heating and orographic effects produced scattered to numerous showers with thunderstorms across the San Juan metropolitan area.
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The episode as NWS SJU wrote it up.
A tropical wave moving across the area, combined with daytime heating and orographic effects produced scattered to numerous showers with thunderstorms across the San Juan metropolitan 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 7, 11:12 AM AST, 2 hours 28 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 1112 AM AST Fri Jul 7 2017 .UPDATE...Weak tropical wave moving across the area has increased scattered shower activity across the islands and regional waters. Scattered to locally numerous showers are expected this afternoon across portions of the mountain ranges and western portions of Puerto Rico. Urban and small stream flooding is expected with the heaviest showers this afternoon. Latest TJSJ sounding indicated 1.78 inches of PWAT and an east steering wind flow at 14-18 kts. Although it shows a dry atmosphere above 700 MB with the passage of the wave we expect showers to continue to develop through the rest of the day. Adjusted short term grids. && .AVIATION...SHRA/TSRA expected this afternoon along the mountain ranges of PR and the western sections of the island. Tempo MVFR conds possible across mainland PR terminals. Mainly VFR elsewhere with VCSH periods at times. Latest 12z TJSJ sounding indicated E winds at 5-22 kts from the SFC to FL100. && .MARINE...Coastal buoys are indicating seas between 3-5 feet and east winds at 10-15 knots with higher gusts. Small crafts should exercise caution across the Atlantic and eastern waters of the islands due to seas up to 6 feet. Moderate risk of rip currents continue for most of the east, north and southern beaches of the islands. && .PREV DISCUSSION... /issued 505 AM AST Fri Jul 7 2017/ SYNOPSIS...A weak tropical wave is passing through today. A remnant low is expected to pass north of the area on Sunday evening then another tropical wave will move through the area on Wednesday. Each of these will increase showers overall and generate more favorable conditions for showers and thunderstorms in western and interior Puerto Rico. SHORT TERM...Today through Sunday A tropical wave across the eastern Caribbean is expected to produce an increase in moisture across the region today. As the wave moves over the region today and tonight, PWAT values will increase to near 2.00 inches. Passing showers will continue to affect the U.S Virgin Islands, Vieques, Culebra, eastern and northern sections of Puerto Rico this morning. The moisture associated with the wave will combine with local effects this afternoon to induce the development of showers and thunderstorms across the region. Due to the expected east northeast wind flow this activity will be focused mostly over interior and southwest Puerto Rico. Abundant cloud cover this afternoon will maintain the maximum temperatures mainly in the upper 80s. Shower and thunderstorms activity is expected to diminish after sunset. For tonight and Saturday morning, passing showers will affect again the eastern sections of Puerto Rico and for Saturday afternoon, the lingering moisture behind the wave is expected to induce another round of showers and thunderstorms over western and interior sections of Puerto Rico with isolated showers elsewhere on the island. Little or no activity is expected in the U.S. Virgin Islands. Tropical depression four is forecast to pass north of the region on Sunday into Monday possible as a tropical wave. Some moisture associated with this system will enhance the development of showers with thunderstorms Sunday afternoon across the Cordillera Central of Puerto Rico. Meanwhile, showers and thunderstorms will be possible from time to time across the U.S. Virgin Islands. LONG TERM...Monday through Thursday Tropical Depression Four, now about 970 miles east of the lesser Antilles, is expected to pass north of the forecast area on Sunday evening. This will cause the surface winds to turn more southeasterly on Monday and Tuesday, which will in turn increase temperatures significantly in the lower elevations on the north side of Puerto Rico and to a limited amount in the U.S. Virgin Islands. It will also usher in a significant amount of Saharan dust that will limit visibilities to below 15 miles in places. The GFS suggests that shower and thunderstorm activity may still be significant owing to precipitable water values of 1.8 inches and lifted indices as low as minus 8, but expect that they will be limited to mainly western Puerto Rico due to drier mid level air. Conditions will slowly return to near normal by Tuesday when 1000-850 mb flow returns to northeast and moisture remains around 1.8 inches. This return to east northeast flow at lower levels occurs as a TUTT low to the northeast moves a little closer and to the north of the local area causing a reflection at lower levels. The current GFS run from 07/00z, which was mostly missing, indicated that a tropical system will pass to the south of the local area in the Caribbean next weekend. It is too soon to assign any credence to this yet. AVIATION...VCSH expected this morning across most of local terminals as showers associated with a tropical wave move into the local flying area. Then isold-sct SHRA/TSRA will form over wrn PR with mtn obscurations and MVFR conds til arnd 07/22Z. Aft 07/22Z mostly VFR with only VCSH expected all TAF sites. Latest TJSJ sounding indicated an ENE wind flow up to 30 knots all the way from the SFC to 44k feet. MARINE...Moderate to fresh trade winds will bring 5 to 6 foot seas for the next several days and mariners will need to exercise caution. The passage of a remnant low to our north on Sunday is not expected to bring any significant increase in seas. Small craft advisories are not expected during the next 7 days. && .PRELIMINARY POINT TEMPS/POPS... SJU 88 78 88 78 / 50 50 50 30 STT 89 79 90 79 / 50 50 50 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...DS LONG TERM....99
Perspectivas sobre condiciones peligrosas del tiempo...CORREGIDO Servicio Nacional de Meteorologia San Juan PR 1055 AM AST viernes 7 de julio de 2017 AMZ710>745-PRZ001>013-080915- 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- 1055 AM AST viernes 7 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 una probabilidad de tronadas aisladas con lluvias fuertes y breves vientos en rafagas esta tarde a traves de porciones del interior y oeste de Puerto Rico. .Inundaciones...Llluvias fuertes pudieran resultar en inundaciones urbanas y de riachuelos a traves del interior y oeste de Puerto Rico. .Vientos...Se esperan vientos en exceso de 20 MPH a traves de las aguas mar afuera del Atlantico. .Olas...Se espera oleaje picado de hasta 6 pies a traves de la mayoria de las aguas del Atlantico y las aguas mar afuera del Caribe. .Corrientes Marinas...Existe riesgo moderado de corrientes marinas para varias playas del norte y sureste de Puerto Rico y la mayoria de las playas de Culebra y Vieques. .Dias dos a siete...sabado a jueves Calor diurno y los efectos locales resultaran en inundaciones urbanas y de riachuelos en el area de tronadas cada tarde mayormente a traves del oeste de Puerto Rico. Oleaje creado por vientos causara corrientes marinas a lo largo de las regiones costeras mayormente al norte y sur 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-VIZ001-002-080915- San Tomas, San John e islas adyacentes-Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 1055 AM AST viernes 7 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 hasta 6 pies a traves de la mayoria de las aguas del Atlantico y las aguas mar afuera del Caribe. .Corrientes Marinas...Existe un riesgo moderado de corrientes marinas para la mayoria de las playas de Santa Cruz. .Dias dos a siete...sabado a jueves Oleaje creado por vientos causara corrientes marinas a lo largo de varias playas de Santa Cruz hasta por lo menos el lunes. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores, sin embargo, se exhorta a los observados a reportar corrientes marinas a la oficina del Servicio Nacional de Meteorologia en San Juan.
The national radar mosaic for the moment the first event began.
5 flood. Local standard time, as filed.
Flooding was reported on road PR-844 Km 1.1 Near San Juan Charlet after hotel Del Valle.
Quebrada Margarita was reported out of its banks near Altamira at Road PR-19.
Flooding was reported on PR-844 KM 1.1 near San Juan Chalet after Hotel del Valle.
Flooding was reported at Avenida Martinez Nadal in direction towards Bayamon across from Bristol Myers.
Flooding was reported at Avenida Martinez Nadal near Casita de Abu.
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: 715609, 715610, 715611, 715612, 715615.