The combination of low level convergence, local effects and available moisture produced showers with periods of locally to strong rainfall across some areas of the island.
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.
The combination of low level convergence, local effects and available moisture produced showers with periods of locally to strong rainfall across some areas of 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 24, 10:53 AM AST, 5 hours earlier.
Area Forecast Discussion National Weather Service San Juan PR 1053 AM AST Thu May 24 2018 .UPDATE...It looks like today will be very similar to yesterday in terms of the weather observed. The morning weather has progressed as expected with mostly fair weather across the local islands with only isolated brief showers. The latest visible satellite imagery is indicating that cloudiness is slowly developing across the local islands. Some clouds are streaming off the USVI and some cloudiness is also streaming off the Luquillo Mountain Range into the San Juan Metro area. Some cloudiness is also developing across the interior and western sections of PR. Most of the areas that have cloudiness developing have a good chance of rain. However, the areas with the highest chance of significant rainfall will be the northwestern quadrant of PR and portions of the San Juan metro area, some of these showers could cause urban and small stream flooding. && .AVIATION...VFR conds across the local terminals with SHRA/TSRA developing across W-NW PR after 24/17Z which could cause MVFR conds TJMZ and TJBQ. TJSJ could observe some SHRA but mainly in the vicinity. Winds will continue from the east at 10-15KT with occasional gusts and sea breeze variations through this afternoon. && .MARINE...Small craft operators are urged to exercise caution due to seas up to 6 feet into tonight. Seas are expected to subside slightly by Friday, with seas generally up to 5 feet. The coastal winds will be mainly 10-20 knots for the rest of today. There is a moderate risk of rip currents across many of the local beaches. && .PREV DISCUSSION... /issued 449 AM AST Thu May 24 2018/ SYNOPSIS...A short wave trough aloft is forecast to swing north of the islands as a TUTT low moves northeastward from the Leeward Islands the next few days. The islands will be wedge by a ridge to the northwest and a TUTT low to the northeast through the upcoming weekend. Tropical wave will approach the Lesser Islands between Saturday night into Sunday morning. SHORT TERM...Today through Saturday... Not much change to the local weather pattern is expected for today across the forecast area. Partly to variably cloudy skies with brief passing shower activity are expected across eastern portions of Puerto Rico and the USVI during the morning hours. During the afternoon, heavy showers and possibly a few isolated thunderstorms are expected to develop across the northwest quadrant of Puerto Rico. Additional shower development is expected across the San Juan metro area downwind from El Yunque as well as some possible streamers developing downwind from the USVI. The rainfall expected across the northwest quadrant of Puerto Rico as well as across the San Juan metro area could result in ponding of water on roadways and in poor drainage areas as well as some localized urban and small stream flooding. Model guidance continues to indicate an increase in low-level moisture via a southeasterly wind flow for Friday and Saturday. Therefore, continue to expect passing trade wind showers affecting eastern portions of Puerto Rico and USVI during the morning hours followed by heavy showers developing across the northwest quadrant of Puerto Rico as well as across portions of the San Juan metro area downwind from El Yunque during the afternoon hours. Given the recent rainfall activity, the potential exists for urban and small stream flooding where the heaviest rainfall occurs. LONG TERM...Sunday through Friday... An increase in low level moisture is expected by early next week as a tropical wave combine with an upper level trough and plenty of low level moisture at the surface. As a result, scattered to numerous showers with isolated thunderstorms are expected to affect the local area Sunday into Monday. Best activity is expected to develop across the Cordillera Central of Puerto Rico. A drier air mass is expected to encompass the region Tuesday and Wednesday, followed by another tropical wave which is forecast by SJU-GFS model to reach the northeast Caribbean by Thursday next week. AVIATION...Mainly VFR conds expected across all terminals through 24/16Z. A few brief passing SHRA could affect the USVI and TJSJ terminals during the morning hours. +SHRA and isolated TS development expected across western and northwestern sections of PR after 24/16Z. Therefore, MVFR conditions are expected across TJBQ and TJMZ terminals. VCSH possible across TJSJ between 24/16-20Z. Winds will be from the E-SE between 15-20 kts with sea breeze variations and occasional gusts through 24/22Z. Winds expected to diminish below 10kts after 24/23Z. MARINE...Seas between 4 to 6 feet and winds up to 20 knots are expected across the local waters. Small craft operators are urge to exercise caution across most waters. && .PRELIMINARY POINT TEMPS/POPS... SJU 87 77 87 77 / 40 40 40 30 STT 87 77 87 77 / 30 30 30 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...JA LONG TERM....99
Perspectivas sobre Condiciones Peligrosas del Tiempo Servicio Nacional de Meteorologia San Juan PR 505 AM AST jueves 24 de mayo de 2018 AMZ710>745-PRZ001>013-250915- 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- 505 AM AST jueves 24 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 aisladas con lluvia fuerte y vientos breves en rafagas esta tarde a traves de sectores del noroeste de Puerto Rico. .Inundaciones...Lluvias fuertes pudieran resultar en inundaciones urbanas y de riachuelos a traves del noroeste de PR al igual que a traves de sectores del area metro de San Juan. .Vientos...Se esperan vientos sostenidos en exceso de 20 mph a traves de las aguas cercanas a la costa y mar adentro del Atlantico y Caribe. .Oleaje...Oleaje picado de 5 a 6 pies es posible a traves de las aguas del Atlantico al igual que a traves de las aguas del Caribe y el Pasaje de Mona. .Corrientes marinas...Existe un riesgo moderado de corrientes marinas para la mayoria de las playas del norte de Puerto Rico y algunas playas del suroeste y sureste, al igual que a traves de Vieques y Culebra. .Dias dos a siete...viernes a miercoles Riesgo moderado de corrientes marinas continuara a traves de las playas locales durante los proximos dias. Aguaceros inducidos localmente y diurnamente junto con tronadas aisladas se desarrollaran en las tardes, mayormente a traves del cuadrante noroeste de Puerto Rico. Esto pudiera resultar en inundaciones urbanas y de riachuelos. .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 y corrientes marinas al Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-250915- San Tomas, San John e Islas Adyacentes- Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 505 AM AST jueves 24 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 .Oleaje...Se espera oleaje de 5 a 6 pies a traves de las aguas adyacentes. .Corrientes marinas...Existe un riesgo moderado de corrientes marinas para las playas del norte y este de Santa Cruz. .Dias dos a siete...viernes a miercoles Existe riesgo moderado de corrientes marinas a traves de las playas 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 y corrientes marinas al Servicio Nacional de Meteorologia en San Juan.
The national radar mosaic for the moment the first event began.
2 heavy rain, 1 flood. Local standard time, as filed.
PR 111 Urban flooding was reported from Banco Popular to Escuela Ramon de Jesus Sierra.
Landslide was reported on road 129, Montebello sector. Trees and rocks blocking road.
Urban flooding at Calle Pedro Albizu.
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: 761907, 761964, 761982.