Locally and diurnal effects combined with plenty of moisture in the low to mid-level to produce showers and thunderstorms across northwest 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.
Locally and diurnal effects combined with plenty of moisture in the low to mid-level to produce showers and thunderstorms across northwest 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 Jul 11, 3:20 PM AST, 3 hours 27 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 320 PM AST Tue Jul 11 2017 .SYNOPSIS...A low pressure north of the region will continue to produce deep convection across the offshore Atlantic Waters. The TUTT low about 750 miles northeast of PR will remain near stationary over next few days while enhance the instability aloft. The next tropical wave is forecast to affect the local islands on Friday. && .SHORT TERM...Today through Thursday...Moisture levels has increased today compared to yesterday. In addition...the concentrations of Saharan Dust has diminished considerably since this morning. Therefore...numerous showers and scattered thunderstorms have developed over the Cordillera Central and the southern half of PR. This diurnal convection will likely generate between 2-4 inches of rain in portions of the Southern half of PR the rest of the afternoon. Most of the afternoon showers will taper off near sunset...leaving partly cloudy skies across most of Puerto Rico for this evening. Deeper moisture associated with an induced trough will approach the USVI and eastern PR on Wednesday morning...bringing a few rounds of scattered showers across portions of the islands. Levels of moisture and instability will continue favorable for afternoon convection on Thursday afternoon. .LONG TERM...Friday through Tuesday...A slot of dry air is forecast to move across the islands by early Friday morning, followed by a tropical wave with plenty of tropical moisture late Friday into Saturday. This feature will provide enough instability and moisture to result in showers and thunderstorms across the region. After the passage of this wave another drier and more stable air mass with Saharan Dust will encompass the local region early next week. && .AVIATION...SHRA/TSRA expected to continue across southern and western Puerto Rico as well as across the northern U.S. Virgin Islands until at least 11/23z. This activity will produce MVFR conditions across TIST, TJPS and TJMZ taf sites with mtn top obscd. VCSH expected elsewhere across the rest of PR and the Leeward TAF sites. Low level winds expected from the ESE at 10 knots diminishing after sunset. && .MARINE...Tranquil marine conditions will continue the rest of the work week with seas of 2-5 feet and winds of 10-20 kts. Conditions may become choppy late Friday into Saturday as a tropical wave moves across the Caribbean Waters. && .PRELIMINARY POINT TEMPS/POPS... SJU 91 79 89 78 / 40 40 40 40 STT 88 78 88 79 / 50 50 50 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...ER LONG TERM....CAM
Perspectivas sobre condiciones peligrosas del tiempo Servicio Nacional de Meteorologia San Juan PR 527 AM AST martes 11 de julio de 2017 AMZ710>745-PRZ001>013-120930- 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- 527 AM AST martes 11 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 con lluvias fuertes y breves vientos en rafagas esta tarde a traves de porciones del interior, norte y oeste de Puerto Rico. .Inundaciones...Lluvias fuertes pudieran resultar en inundaciones urbanas y de riachuelos. .Calor...El flujo de viento del sureste resultara en temperaturas mas altas de lo normal a lo largo de la costa norte y oeste de Puerto Rico. .Dias dos a siete...miercoles a lunes Aguaceros y tronadas pudieran resultar en inundaciones urbanas y de riachuelos en alguans areas del interior y oeste de Puerto Rico cada tarde. Se pronostica que una onda tropical se mueva a traves de las aguas del Caribe desde el viernes hasta el sabado...aumentando el potencial de tronadas e inundaciones urbanas y de riachuelos. Un riesgo moderado de corrientes marinas se espera a traves de las playas del este, norte y sur durante el resto de la semana. Un riesgo alto de corrientes marinas es posible a traves de las playas del sur durante el fin de semana. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores, sin embargo, se exhorta a los observados a reportar inundaciones a la oficina del Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-120930- San Tomas, San John e islas adyacentes-Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 527 AM AST martes 11 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 No se esperan condiciones peligrosas en estos momentos. .Dias dos a siete...martes a domingo Se pronostica que una onda tropical se mueva a traves de las aguas del Caribe desde el viernes hasta el sabado...aumentando el potencial de tronadas e inundaciones urbanas y de riachuelos. Un riesgo moderado de corrientes marinas se espera mayormente para Santa Cruz durante el resto de la semana. Un riesgo alto de corrientes marinas es posible a traves de las playas del este y sur durante el fin de semana. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores.
The San Juan radar (TJUA), 104 km away, was scanning. The volume nearest the first event began at 22:45 UTC.
2 funnel cloud. Local standard time, as filed.
A funnel cloud was reported a few miles north of Isabela and Quebradillas. The funnel cloud was seen from Guajataca Lake.
A waterspout was reported and observed at Guajataca Sector near El Tunel de Guajataca.
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: 715620, 715622.