Locally and diurnally induced showers and thunderstorms developed over the San Juan metro area as well as across portions of interior and western PR.
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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.
Locally and diurnally induced showers and thunderstorms developed over the San Juan metro area as well as across portions of interior and western 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 27, 11:40 AM AST, 2 hours 50 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 1140 AM AST Mon Aug 27 2018 .UPDATE... No changes were made to the inherited forecast. Continue to expect afternoon convection along and to the west of the Cordillera Central as well as downwind from El Yunque into the San Juan Metro Area. The U.S. Virgin Islands can expect passing showers from time to time through the afternoon hours. Low-level moisture and instability will continue to increase across the islands through mid-week as a tropical wave is forecast to affect the local archipelago. && .AVIATION... SHRA are expected to move across the flying area through the rest of the day. Cloudiness will increase and +SHRA/TSRA will develop btwn 27/16-23z across W-PR through this evening. MVFR conds are expected over TJBQ/TJMZ and possibly near TJSJ as TSRA/+TSRA could develop in the vicinity affecting the terminals. Sfc winds will continue from the E-ESE at 10 to 20 knots with higher gusts and sea breeze variations. && .MARINE... East to east-southeast winds at 15 to 20 knots will create brief choppy conditions across the north and south coastal waters of Puerto Rico, where small craft operators should exercise cautions. Elsewhere winds will continue around 15 knots. Mariners can expect seas between 1 and 3 feet across the protected waters and between 2 and 4 feet across exposed waters. In addition, thunderstorms could move into the northern and western coastal waters of Puerto Rico through this evening. && .PREV DISCUSSION... /issued 517 AM AST Mon Aug 27 2018/ SYNOPSIS...A weak upper level trough will remain to the northeast of the region through the reminder of the work week. A tropical wave is forecast to move into the region late Wednesday and bring a surge of moisture over the area. This moisture is expected to remain across the area through Friday, with showers and isolated thunderstorms over portions of eastern and western Puerto Rico during the afternoons. The moisture is forecast to retreat away from the air as drier air filters in from the east, this drier air will remain until late Sunday, then another wave will move into the region and increase showers and thunderstorms on Monday. SHORT TERM...Today through Wednesday... Broad surface high pressure will continue across the subtropical Atlantic driving 10 to 18 knot easterly trade winds through the area. The TUTT to our northeast will begin to form a new low today about 780 miles northeast that will drift west through Wednesday. Moisture is expected to improve considerably through the day then remain generally similar through Tuesday evening before increasing again on Wednesday. Moisture generally increases at lower levels Monday through Wednesday as does instability below 500 mb. Since surface winds remain more or less easterly through the period showers and thunderstorms will develop in western Puerto Rico each day. And night and early morning showers will occur over the eastern mountains and slopes. Some urban and small stream flooding is expected each day, but amounts and coverage should progress today through Wednesday. At this time although widespread flooding is not expected some rivers could approach flood stage. Also some areas in Guaynabo and Bayamon could see some very heavy rains during the afternoons as the sea breeze interacts with a streamer off of El Yunque. Thunderstorms with frequent lighting are also expected to increase as the low pressure aloft develops to our north. LONG TERM...Thursday through Monday...A weak upper level trough will remain to the northeast of the region through the reminder of the work week. A tropical wave is forecast to move into the region late Wednesday and bring a surge of moisture over the area. This moisture is expected to remain across the area through Friday, with showers and isolated thunderstorms over portions of eastern and western Puerto Rico during the afternoons. The moisture is forecast to retreat away from the air as drier air filters in from the east, this drier air will remain until late Sunday, then another wave will move into the region and increase showers and thunderstorms on Monday. AVIATION...VFR conds will prevail thru 27/16Z altho brief MVFR is psbl TNCM/TKPK for CIGS and mtn obscurations will be present in the Luquillo range of PR. Aft 27/16Z SHRA and psbl TSRA will dvlp VCNTY TJSJ mostly S-W and also SHRA/TSRA in wrn PR where brief MVFR conds are expected at TJMZ/TJBQ. Conds impvg aft 27/22Z wrn PR. Sfc winds ESE 10-20 kt with sea breeze variations bcmg 10-15 aft 27/22Z. Max winds blo FL540 less than 20 kt..strongest BLO FL070. MARINE...Seas will be range from 3 to 5 feet with winds ranging from 10 to 15 kts with higher gusts possible. Small craft operators are urged to exercise caution due to choppy seas and winds gust up to 20 kts. Seas will remain unsettled starting during the middle of the work week as a result of a tropical wave that will move into the local water late Wednesday or early Thursday. && .PRELIMINARY POINT TEMPS/POPS... SJU 89 79 88 79 / 40 40 40 60 STT 89 80 90 79 / 50 50 60 70 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && UPDATE...CAM AVIATION...CAM
Perspectivas sobre Condiciones Peligrosas del Tiempo Servicio Nacional de Meteorologia San Juan PR 524 AM AST lunes 27 de agosto de 2018 AMZ710>745-PRZ001>013-280930- 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- 524 AM AST lunes 27de agosto de 2018 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 lluvia fuertes y rafagas de vientos esta tarde a traves de sectores del oeste de Puerto Rico. .Inundaciones...Lluvias fuertes pudieran resultar en inundaciones urbanas y de riachuelos en el oeste de Puerto RIco y sobre el suroeste del area metropolitana de San Juan. .Corrientes marinas...Existe un riesgo moderado de corrientes marinas para las playas del norte, sureste y suroeste de Puerto Rico, al igual que para algunas playas de Vieques. .Dias dos a siete...martes a domingo Las condiciones se deterioraran un poco a medida que una onda tropical se acerque al area el martes resultando en inundaciones urbanas. Luego, el miercoles y jueves, inundaciones urbanas y de riachuelos pudieran afectar un area mas amplia. Algunas areas experimentaran lluvia muy fuerte, rayos frecuentes y posibles deslizamientos de lodo. Las condiciones mejoraran el viernes y sabado, pero la posibilidad de inundaciones continuara en las areas locales. El riesgo de corrientes marinas se extendera alrededor de la costa de Puerto Rico el martes hasta el jueves. Existe riesgo alto de corrientes marinas sobre el este de Vieques el jueves. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo, se les exhorta a los observadores individuales a reportar inundaciones y corrientes marinas al Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-280930- San Tomas, San John e Islas Adyacentes- Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 524 AM AST lunes 27 de agosto de 2018 Esta perspectiva sobre las condiciones del tiempo peligrosas es para las Islas Virgenes Americanas y las aguas costeras adyacentes. .Dia Uno...Hoy y esta noche Corrientes marinas...Existe un riesgo moderado de corrientes marinas para las playas del norte y este de Santa Cruz. .Dias dos a siete...martes a domingo Aguaceros y tronadas aumentaran el martes hasta el jueves a medida que una onda tropical se mueva sobre el area el miercoles y la humedad continue hasta el viernes. Alguna lluvia pudiera ser posible con tronadas. El riesgo moderado de corrientes marinas continuara. Se espera riesgo alto de corrientes marinas el viernes en Santa Cruz. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo, se les exhorta a los observadores individuales a reportar corrientes marinas al Servicio Nacional de Meteorologia en San Juan.
The national radar mosaic for the moment the first event began.
2 flood, 1 heavy rain. Local standard time, as filed.
Flooding in a road near WAPA TV due to heavy rain.
A few roads, including road 19 near Hospital del Ni o, flooded due to heavy rain.
Mudslide reported near Road 607 and Road 531 in Utuado.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2018Every state in 2018This day in weather historyWarnings in Puerto Rico, August 2018
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: 783411, 783412, 783413.