An upper level trough continued maintaining a wet weather pattern across the region. Flash flood warnings were issued due to heavy rain.
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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.
An upper level trough continued maintaining a wet weather pattern across the region. Flash flood warnings were issued due to heavy rain.
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 9, 10:47 AM AST, 3 hours 13 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 1047 AM AST Tue May 9 2017 .UPDATE...Partly to variably cloudy skies prevailed across the forecast area. An isolated thunderstorm developed by mid morning across the eastern sections of PR leaving between 1-2 inches of rainfall. Additional showers were already developing across the Cordillera Central and NW coastal sections of PR. Trof aloft and abundant low level moisture will continue to provide favorable environmental conditions across the islands. The sea breeze has formed across northern PR and its expected to aid into the development of showers and thunderstorms across mainland PR. Minor changes were made to short term grids to adjust the current weather over PR. && .AVIATION...No significant change from previous aviation discussion. Tempo MVFR to brief IFR possible across the northern terminals of PR this afternoon as well across the USVI terminals. SHRA/TSRA is expected to continue across the forecast area through late Wednesday. Latest 09/12z TJSJ upper air sounding indicated ESE winds at 11 knots or less below 4 kft and southerly thru FL090...becmg W and increasing w/height...50+ kts abv FL330. && .MARINE...Coastal buoys are indicating seas between 2-4 feet and east-southeast winds at 8-12 knots. Seas expected to continue at less than 5 feet for the next several days. For the rest of today and into Wednesday morning, scattered to numerous showers and thunderstorms are expected across the coastal waters of the islands. Mariners should be alert as weather conditions can deteriorate quickly over the waters. && .PREV DISCUSSION... /issued 507 AM AST Tue May 9 2017/ SYNOPSIS... An amplifying trough is expected to produce unstable weather conditions through at least Thursday. This mid-upper level trough will meander over the islands and will interact with plenty of surface moisture producing a wet pattern through most of the work week. An upper level ridge is then forecast to build over the northeast Caribbean by the upcoming weekend into early next week. SHORT TERM... Moisture continues to be drawn northeast along an old frontal/shearline boundary and this moisture transport has been aided by the recent passage of a tropical wave to the south. The boundary is moving very slowly, but peak moisture of the week is still expected this evening. Other indications are that instability will also increase as upper atmosphere cools slightly. This should produce more thunderstorms today than Monday. Also a broad upper level trough will be moving into the area today and passing tomorrow. Convection would be even stronger today were it not for the relatively solid layer of clouds between 400 and 500 mb that will block a large portion of the direct sunlight today. That moisture will fade tomorrow and Thursday but shower activity will not be reduced due better heating and persisting moisture in the layers below. Thursday will also be the last day that upper levels favor strong or enduring convection. LONG TERM...Friday through Tuesday... Model guidance continues to suggest the upper level trough axis over the Lesser Islands by Friday. If this weather pattern is right, subsidence aloft will be unfavorable for deep convection over the islands. A mid to upper level ridge is then forecast to build aloft to bring a more stable weather conditions by Saturday into Tuesday. However, the lingering surface moisture will result in periods of showers and thunderstorms during the afternoons and early evening hours due to the combination of daytime heating and local effects mainly along the Cordillera and western sections of Puerto Rico. The U.S. Virgin Islands, as well as the south and east sections of PR, can expect passing showers mainly during the overnight and early morning hours each day. AVIATION... Isold SHRA will continue across eastern PR and local waters to the east through 09/14Z causing VCSH near TJSJ/TIST/TISX/TNCM/TKPK. Aft 09/16Z afternoon SHRA/TSRA developing across PR will cause mtn obscurations and VCSH/VCTS at TJBQ, TJMZ, and possibly TJSJ between 09/17Z and 04/23Z. TEMPO MVFR conds possible at TJBQ/TJMZ between 09/18Z and 04/21Z. Winds will be mainly from the ESE at about 10-15KT with sea breeze variations developing after 04/14Z. Max winds west 65 kts at FL410 at 09/18Z. MARINE... Mariners can expect seas up to 5 feet over the offshore waters and less than 5 feet elsewhere. East to east-southeast winds at 10 to 15 knots will continue across the local waters, but gusty conditions are likely in and near shower and thunderstorm activity. Thunderstorm development is forecast to deteriorate the local marine conditions as an upper level trough lingers across the region. Therefore, mariners are urge to exercise caution under this weather pattern. For the beach goers, there is a low to moderate risk of rip current across the local beaches. In general, the moderate risk of rip currents are for the beaches of St. Croix, Vieques, Culebra and along the north, northwest and southeast coasts of PR. && .PRELIMINARY POINT TEMPS/POPS... SJU 88 75 87 77 / 70 50 60 20 STT 84 75 84 75 / 60 70 60 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && UPDATE...DS
Perspectivas sobre condiciones peligrosas del tiempo Servicio Nacional de Meteorologia San Juan PR 538 AM AST martes 9 de mayo de 2017 AMZ710>745-PRZ001>013-100945- 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- 538 AM AST martes 9 de mayo 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...algunas tronadas se formaran hoy con lluvias fuertes y vientos en rafagas breves esta tarde a traves de porciones del noroeste, oeste e interior de Puerto Rico. .Inundaciones...Lluvias fuertes pudieran resultar en inundaciones urbanas y de riachuelos. .Viento...Vientos sostenidos de mas de 20 MPH son probables fuera de la costa noroeste de Puerto Rico. .Corrientes marinas...Existe un riesgo moderado de corrientes marinas para varios sitios a lo largo de las playas del norte de Puerto Rico y Culebra y muchas de las playas del sur de Vieques. .Dias dos a siete...miercoles a lunes Condiciones de tiempo humedas con lluvias fuertes y algunas tronadas continuaran hasta el viernes y nuevamente tarde el domingo hacia el lunes. El riesgo de inundaciones urbanas y de riachuelos acompanaran estos aguaceros. .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, trombas marinas y corrientes marinas al Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-100945- San Tomas, San John e islas adyacentes- Santa Cruz-Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 538 AM AST martes 9 de mayo 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 .Corrientes marinas...Existe un riesgo moderado de corrientes marinas para varias playas en Santa Cruz. .Dias dos a siete...miercoles a lunes Riesgo moderado de corrientes marinas continuara para sectores de Santa Cruz. Existe la posibilidad de inundaciones menores urbanas y de cunetas en las Islas Virgenes el lunes. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo, se les exhorta a los observadores individuales a reportar trombas marinas 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.
Emergency manager from Ciales reported mudslides across roads PR-608, PR-614 near Km 5.0. Also, in Barrio Pozas sector Hoyo and another mudslide affected a residence in sector Pozo Muro. In Addition, the Rio Barbas flood waters damaged a bridge.
Roads PR-446, KM 0.2 intersection with PR-125 near Selectos Supermarket were affected by flooded waters from Rio Culebrinas.
Emergency manager officials reported road PR-489 K.M 1.7 in Barrio Aibonito closed due to a mudslide sector Las Cuarenta of Hatillo.
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, May 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: 703975, 703976, 698054.