Locally induced showers and thunderstorms resulted in flash flooding across the island.
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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 induced showers and thunderstorms resulted in flash flooding across the island.
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 May 28, 5:03 AM AST, 5 hours 12 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 503 AM AST Mon May 28 2018 .SYNOPSIS...Surface high pressure located across the eastern Atlantic will continue to induce a southeasterly wind across the forecast area throughout the period. The forecast area will be sandwiched in between a mid to upper-level ridge located across the western Atlantic and a mid to upper-level trough located northeast of the Leeward Islands through the latter half of the work week. Afterwards, as the mid to upper-level trough lifts towards the northeast, a deep-layered ridging pattern will establish itself across the forecast period. && .SHORT TERM...Today through Wednesday... The Doppler radar detected a few showers across the local waters and some of them moved across the northern U.S. Virgin Islands and eastern Puerto Rico early this morning. Rainfall amounts were minimal. Satellite imagery depicted another patch of moisture approaching the islands which combined with low level convergence will result in shower activity across these areas through the morning hours. Periods of moderate to heavy rainfall are expected to develop downwind from El Yunque into the San Juan Metro area during the afternoon hours. However, the strongest activity is expected to affect the northwest quadrant of Puerto Rico, where rainfall accumulation could surpass one inch. Soils are already saturated due to previous rains and any additional strong activity could lead to rapid river rises, urban flooding and mud slides across steep terrains. The rest of the islands could expect mostly sunny to partly cloudy skies with little or no shower activity. Puerto Rico and the U.S. Virgin Islands will be sandwiched by a mid to upper level trough near the Lesser Antilles and a ridge west of the islands. The surface high pressure over the central Atlantic Ocean will continue dominating the local weather conditions, promoting an advective pattern across the islands Tuesday and Wednesday. During the afternoon hours, showers and thunderstorms will develop mainly over the western and interior sections of Puerto Rico as well as downwind from the U.S. Virgin Islands. .LONG TERM...Thursday through Tuesday... A seasonable weather pattern is expected to prevail across the forecast area through the first half of the upcoming weekend as patches of low-level moisture being induced by the mid to upper- level trough located to the northeast of the Leeward Islands move across the forecast area. Therefore, expect brief isolated to scattered shower activity across portions of eastern PR and the USVI during the overnight and early morning hours followed by afternoon convection developing, mainly across the northwest quadrant of PR. By late into the upcoming weekend into the first half of the first full week of June, model guidance is suggesting that a deep-layered ridging pattern will establish itself across the forecast area. Therefore, a drier and more stable airmass with limited shower activity would be expected. In addition, some suspended Saharan dust as well as hot temperatures across the northern coast of Puerto Rico are also possible with this pattern. && .AVIATION... Passing SHRA will affect the windward terminals throughout the morning hours. Most of the activity is expected -SHRA/-SHRA. Then, SHRA/+SHRA with isold TSRA are expected to developed across the interior and NW PR to result in MVFR/brief IFR conditions btwn 28 /16z-23z. Also, moderate to strong showers could developed near TJSJ/TIST around that period too. Easterly winds will continue at 10 knots or less with land breezes, winds are expected to increase at 10 to 20 knots with higher gusts and sea breezes after 28/13z. && .MARINE...Choppy seas of 4 to 6 feet expected across the offshore Atlantic waters while seas of 5 feet or less are expected elsewhere with east winds up to 20 knots. Therefore, Small craft operators should exercise caution across the regional waters. A moderate risk of rip currents will continue across many of the local beaches. && .PRELIMINARY POINT TEMPS/POPS... SJU 88 78 88 77 / 40 40 40 50 STT 87 77 87 77 / 40 40 30 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...CAM LONG TERM....GL
Perspectivas sobre Condiciones Peligrosas del Tiempo Servicio Nacional de Meteorologia San Juan PR 557 AM AST lunes 28 de mayo de 2018 AMZ710>745-PRZ001>013-291000- 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- 557 AM AST lunes 28 de mayo 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 probabilidad de tronadas con lluvia fuerte y vientos breves en rafagas esta tarde a traves de porciones del noroeste de Puerto Rico. .Inundaciones...Lluvias fuertes pudieran resultar en inundaciones urbanas y de riachuelos a traves del noroeste de Puerto Rico y el area metropolitana de San Juan. .Vientos...Se esperan vientos sostenidos en exceso de 20 mph a traves de las aguas locales. .Olas...Oleaje picado/peligroso hasta 6 pies se anticipa a traves de las aguas locales. .Corrientes marinas...Existe un riesgo moderado de corrientes marinas a traves de la mayoria de las playas locales, excepto por las playas del oeste. .Dias dos a siete...martes a domingo Aguaceros y tronadas inducidos localmente y diurnamente se desarrollaran cada tarde a traves del cuadrante noroeste de Puerto Rico. Los suelos ya estan saturados debido a las lluvias previas y cualquier actividad fuerte adicional podria resultar en inundaciones urbanas, aumentos subitos en los rios y deslizamientos de lodo en areas de terreno empinado. Riesgo moderado de corrientes marinas continuara a traves de varias playas locales durante los proximos dias. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo, se les exhorta a los observadores individuales a reportar vientos fuertes, inundaciones y corrientes marinas al Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-291000- San Tomas, San John e Islas Adyacentes- Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 557 AM AST lunes 28 de mayo 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 .Inundaciones...Lluvias fuertes pudieran resultar en inundaciones urbanas y de riachuelos. .Vientos...Se esperan vientos sostenidos en exceso de 20 mph a traves de las aguas locales. .Olas...Oleaje picado/peligroso hasta 6 pies se anticipa a traves de las aguas mar afuera del Atlantico. .Corrientes marinas...Existe un riesgo moderado de corrientes marinas para la mayoria de las playas de Santa Cruz. .Dias dos a siete...martes a domingo Riesgo moderado de corrientes marinas continuara a traves de las playas locales de Santa Cruz durante los proximos dias. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo, se les exhorta a los observadores individuales a reportar vientos fuertes, inundaciones y corrientes marinas al Servicio Nacional de Meteorologia en San Juan.
The national radar mosaic for the moment the first event began.
1 flood, 1 heavy rain. Local standard time, as filed.
Emergency manager from PREMA Aguadilla region reported PR 418 between Aguada and Aguadilla closed, due to Rio Culebrinas out of its banks.
Mudslide was reported in Barrio Altosano Road 109 in San Sebastian.
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, May 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: 762017, 762000.