An upper-level low/TUTT over the northeast Carribbean combined with low to mid-level moisture to produce locally and diurnally induced shower activity across the region. With an east southeast flow, a line of showers developed downstream from El Yunque and affected the San Juan metro area during the late morning and afternoon hours.
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The episode as NWS SJU wrote it up.
An upper-level low/TUTT over the northeast Carribbean combined with low to mid-level moisture to produce locally and diurnally induced shower activity across the region. With an east southeast flow, a line of showers developed downstream from El Yunque and affected the San Juan metro area during the late morning and afternoon hours.
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 Jun 10, 10:24 AM AST, 2 hours 34 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 1024 AM AST Sat Jun 10 2017 .UPDATE...Showers and a couple of thunderstorms affected the eastern sections of Puerto Rico, including the Metropolitan area this morning. This activity will continue to affect this section of the island during the rest of the morning hours and possible during the afternoon. This moisture is expected to combine with daytime heating, sea breeze convergence and other local effect to induce a new round of showers and thunderstorms across interior, western and northern sections of Puerto Rico this afternoon and early this evening. An upper level low/TUTT over the northeast Caribbean is expected to remain as the main weather feature across the region for the rest of the weekend. This upper low will aid in the development of afternoon showers and thunderstorms especially over northwest Puerto Rico. Scattered showers are also possible across portions of the San Juan Metro Area this afternoon. Easterly winds are expected to increase and becomes more from the northeast tonight and Sunday. This wind flow is expected to bring scattered showers to the Leeward and U.S. Virgin Islands as well as across the northern sections of Puerto Rico tonight and Sunday Morning with a new round of thunderstorms over interior and southwest Puerto Rico Sunday afternoon. && .AVIATION...Mostly VFR conditions are expected for most of the TAF sites during the next 24 hours. However, showers will continue to move from the coastal waters to produce mostly VCSH across the U.S. Virgin Islands and Leeward Islands TAF sites for the rest of the morning hours. SHRA and ISOLD TSRA expected to develop between 18Z-22Z near TJBQ and possibly TJMZ. This activity may lead to brief MVFR/IFR at TJBQ and possible TJMZ. Later TJSJ sounding indicated a light east to east southeast wind flow all the way from the surface to around 15k feet. && .MARINE...A relatively quiet marine conditions will continue across the regional waters this afternoon. However, slightly choppy conditions can be expected over the local Atlantic waters tonight and Sunday with seas up to 6 feet and winds up to 20 knots. && .PREV DISCUSSION... /issued 347 AM AST Sat Jun 10 2017/ SYNOPSIS...Surface high pressure will remain anchored across The central Atlantic through the weekend. This will help maintain moderate easterly trade winds across the local area. A tutt low and associated mid level trough will linger across the northeastern Caribbean through the weekend to maintain unstable conditions aloft. This feature along with local and diurnal effects will help to enhance and ventilate any localized daytime convection. SHORT TERM...Today through Monday...Upper level low/TUTT over Puerto Rico and the Virgin Islands will linger across the NE Caribbean through early next week. This feature is inducing a surface trough over the Lesser Antilles. Although...the induced trough will remain east of the forecast area...the easterly trades will continue to push scattered showers across the regional waters from time to time. For this afternoon...numerous showers and isolated thunderstorms will cluster over NW PR. Also the east-southeast flow will favor the generation of streamers downwind of El Yunque and the small islands. Therefore...scattered showers are also possible across portions of the San Juan Metro Area this afternoon. A wind surge approaching from the northeast will bring a round of scattered showers to the Leeward Islands and PR/USVI on Sunday. Then...a drier and more stable air mass will reach the region on Monday ahead of a developing surface trough and the next Tropical Wave on Tuesday. All in all...the upper low/TUTT will provide enough instability to induce the development of shower and thunderstorms each afternoon over Western PR though at least Monday. LONG TERM...Tuesday through Sunday... Expect drier and stable conditions Tuesday through Wednesday, as the mid to upper level trough will lift northwards as high pressure ridge builds and spread eastwards across the forecast area from the west and southwest Atlantic. In the meantime, surface high pressure ridge north of the region will gradually weaken Tuesday thru Friday, as a surface trough develops and move across the area. A tropical wave is also forecast to enter and move across the eastern Caribbean Wednesday through Thursday, but is so far expected to move mainly south of the region with model guidance also suggesting Saharan dust accompanying this wave. Both of the previously features should however transport sufficient tropical moisture across the area to support early morning passing showers, followed by isolated to scattered afternoon convection each day with isolated thunderstorms possible mainly over parts of the interior and west sections of Puerto Rico. Local and diurnal effect along with the available moisture should be the main driving force for afternoon convection as no major feature is forecast to directly affect the region at this time. AVIATION...VFR conds are forecast for most of the TAF sites. SCT SHRA en route from the Leeward Islands to Puerto Rico. SCT020 and SCT050 will prevail across the flying area. +SHRA and ISOLD TSRA expected once again near TJBQ between 18Z-22Z. This activity may lead to brief MVFR/IFR. Depth layer easterly winds of 10-15 kt will continue below FL150. MARINE...Slightly choppy conditions can be expected over the local Atlantic waters today with seas up to 5 feet and winds up to 20 knots. Winds and seas will increase during the remainder of the weekend and into early next week with seas expected to increase to up to 6 feet due to the moderate to fresh winds driven seas. && .PRELIMINARY POINT TEMPS/POPS... SJU 90 79 87 78 / 20 50 50 20 STT 89 78 89 78 / 20 50 50 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...JF LONG TERM....99
Perspectivas sobre condiciones peligrosas del tiempo Servicio Nacional de Meteorologia San Juan PR 357 AM AST sabado 10 de junio de 2017 AMZ710>745-PRZ001>013-110800- 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- 357 AM AST sabado 10 de junio 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...Tronadas aisladas con fuertes lluvias son probables a traves de porciones del noroeste de Puerto Rico esta tarde. .Inundaciones...Fuertes lluvias persistentes probablemente resultara en inundaciones urbanas y de riachuelos a traves de porciones del noroeste de Puerto Rico. .Corrientes Marinas...Existe un riesgo moderado de corrientes marinas para la mayoria de las playas de la costa norte y suroeste de Puerto Rico. .Dias dos a siete...domingo a viernes Una vaguada dominara el patron de tiempo local hasta temprano la semana proxima. Esto favorecera el desarrollo de aguaceros y tronadas cada tarde sobre el oeste de Puerto Rico. El riesgo moderado de corrientes marinas continuara hasta por lo menos finales de la semana. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores, sin embargo, se exhorta a los observados a reportar inundaciones y corrientes marinas a la oficina del Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-110800- San Tomas, San John e islas adyacentes-Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 357 AM AST sabado 10 de junio 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 las playas a lo largo de la costa este de Santa Cruz. .Dias dos a siete...domingo a viernes Una vaguada dominara el patron de tiempo local hasta temprano la semana proxima. Esto favorecera del desarrollo de aguaceros y tronadas a traves de las aguas regionales y porciones de las islas. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion de observadores.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Urban flooding was reported at PR Road 181 near Plaza Trujillo.
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, June 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: 709377.