An upper-level trough near the area combined with strong daytime heating and sea breeze convergence to result in the development of strong thunderstorms across interior and western Puerto Rico during the afternoon hours.
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The episode as NWS SJU wrote it up.
An upper-level trough near the area combined with strong daytime heating and sea breeze convergence to result in the development of strong thunderstorms across interior and western Puerto Rico during the 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 7, 11:48 AM AST, 2 hours 57 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 1148 AM AST Fri Jun 7 2019 .UPDATE... Mostly clear skies with some haziness and warm to hot temperatures will continue across most of the islands the rest of this morning. However, cloudiness is expected to increase mainly along and to the north of the Cordillera Central in Puerto Rico as well across the western sections of the Virgin Isles. Showers and thunderstorms are expected along and north of the Cordillera Central, especially across the northwest quadrant of PR. The Virgin Islands and the San Juan Metro area should not ruled out afternoon convection. && .AVIATION... Mostly VFR conds will prevail through the forecast cycle. However, brief periods of MVFR conds are expected over TJMZ/TJBQ due to SHRA/TSRA between 07/17z and 07/22z. MVFR conds should not be ruled out at TJSJ, due to the possibility of TSRA formation. However most of the activity is expected in the VCTY. TIST/TISX can expect VCSH. Winds will continue from SE at 10-15 knots with higher gusts and sea breeze variations. Winds are forecast to become calm to light and vrb after 07/23z. && .MARINE... Tranquil marine conditions will continue across the local waters, but thunderstorms could impact the surrounding waters of north- central and west Puerto Rico through the afternoon hours. && .PREV DISCUSSION... /issued 445 AM AST Fri Jun 7 2019/ SYNOPSIS...Shower and thunderstorm development will continue to prevail across the interior, north central and northwest Puerto Rico each afternoon. A tropical wave is forecast to move through the region early next week, increasing the chance for showers and thunderstorms across the forecast area. As this feature moves away Monday night, drier and stable weather conditions are expected to prevail across the forecast area much of the upcoming week. SHORT TERM...Today through Sunday... Moderate showers just south through west of Ponce dissipated early in the morning but left cloudy skies with some mtn obscurations. Isolated showers were noted over the local waters--mainly in the northeast and southwest quadrants of the forecast area. High pressure at the surface will continue to dominate the eastern Atlantic while low pressure resides in the southwest Caribbean the entire period. This will promote gentle to moderate trade winds during the period. These winds travel across most of the Atlantic and will carry Saharan dust and create hazy skies during the period. Visibilities, however, are expected to remain above 7 miles. At mid levels there is modest moisture with troughiness north of the area. High pressure dominates the Caribbean. At upper levels, A TUTT low will sag south from its current position about 700 miles due north of San Juan to about 140 miles north of San Juan later on Sunday. Upper level divergence is mostly absent. The lower layers of the atmosphere remain relatively moist and will support showers and afternoon thunderstorms throughout the period. 500 mb temperatures will continue to fall with the approach of the upper level low and instability will also increase as they do. By 09/00Z the LI over San Juan is forecast to be minus 8 degrees while the lowest 500 mb temperatures will be less than minus 8.5 degrees from Saturday afternoon to Sunday afternoon when activity will be the greatest. This also corresponds to some of the best precipitable water values of the week as well. Typically the approach of an upper level low pressure greatly facilitates the generation of lightning, so thunderstorms may persist later into the night on Saturday and be seen earlier on Sunday with frequent lightning in the northwest and interior portions of Puerto Rico Sunday afternoon. Some thunderstorms will extend into the marine areas and persist overnight Saturday night. Would expect urban and small stream flooding to be more likely on Sunday. An area of drier air moves into the area Sunday night ahead of a tropical wave that will enter at the beginning of the long term period. LONG TERM...Monday through Saturday... TUTT is expected to meander northeast of the forecast area much of the upcoming week. At lower levels, a broad surface high pressure across the north central Atlantic will yield easterly winds Tuesday through Saturday. A tropical wave and its associated moisture will move across the local Caribbean waters Monday. Under the aforementioned pattern, showers and isolated thunderstorms are expected across the US Virgin Islands and the eastern third of Puerto Rico on Monday morning as the tropical wave approaches the eastern Caribbean. Showers and thunderstorms are then expected to spread over and north of the Cordillera Central Monday afternoon as the wave moves over the local Caribbean waters. Soils are already saturated and small streams and rivers are running above normal levels over northwest Puerto Rico, therefore urban and small stream flooding is possible across these areas. As this feature moves away Monday night, drier and stable weather conditions are expected to prevail across the forecast area much of the upcoming week under limited low level moisture and convergence aloft associated with the meandering TUTT. AVIATION...Mostly VFR conds are expected to prevail at all TAF sites til arnd 07/1530Z. Some mtn obscurations bfr then arnd south central Cordillera Central. Aft 07/15Z areas of MVFR/IFR and mtn obscurations to dvlp in SHRA/TSRA ovr areas north of Cordillera Central and west of Trujillo Alto and arnd Luquillo range--area includes TJMZ/TJBQ. Southeasterly winds at around 10 knots with higher gusts and sea breeze variations to continue. MARINE...Tranquil marine conditions are expected to prevail during the next several days with seas below 5 feet and winds out of the east southeast at 5 to 15 kts. There is a moderate risk of rip currents for some of the north facing beaches of Puerto Rico. Hazard continue to be showers and isolated thunderstorms over the surrounding waters of north-central and west Puerto Rico each afternoon. && .PRELIMINARY POINT TEMPS/POPS... SJU 91 78 91 78 / 40 40 20 40 STT 88 79 88 80 / 30 30 20 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...CAM LONG TERM....99 AVIATION...
Perspectivas sobre Condiciones Peligrosas del Tiempo Servicio Nacional de Meteorologia San Juan PR 409 AM AST viernes 7 de junio de 2019 AMZ710>745-PRZ001>013-080815- 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 mar afuera del Atlantico y Caribe- 409 AM AST viernes 7 de junio de 2019 Esta perspectiva sobre las condiciones peligrosas del tiempo es para Puerto Rico y las aguas costeras adyacentes del Atlantico. .Dia Uno...hoy esta noche .Tronadas...Tronadas con lluvia fuerte y periodos breves de vientos en rafaga son probables esta tarde a traves del cuadrante noroeste de Puerto Rico y son posibles sobre el interior central. .Inundaciones...Lluvia fuerte pudiera resultar en inundaciones urbanas y de riachuelos sobre terreno saturado. .Corrientes marinas...Existe riesgo moderado de corrientes marinas para las playas de la zona metropolitana de San Juan y Bayamon. .Calor...Vientos del sureste y puntos de condensacion altos resultran en indices de calor por encima del promedio de hasta 105 grados para la costa del noreste central y la costa sur de Puerto Rico. .Dia dos a siete...sabado a jueves El riesgo de corrientes marinas aumentara a moderado alrededor de Puerto Rico del sabado al lunes en la noche. Luego, el riesgo se tornara bajo gradualmente en todas las costas para el jueves. El riesgo de inundaciones urbanas y de riachuelos continuara hasta al menos el sabado en la noche. Se esperan rayos frecuentes durante las tardes del sabado y el domingo. No se puede descartar el riesgo de tronadas de lunes a jueves sobre sectores del oeste e interior central de Puerto Rico. Vientos del sureste y temperaturas calidas con humedad alta causaran indices de calor de hasta 105 grados en la costa del noreste central y la costa sur de sabado a lunes durante las tardes. .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-VIZ001-002-080815- San Tomas, San John y Islas Adyacentes- Santa Cruz-Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 409 AM AST viernes 7 de junio de 2019 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 No se espera tiempo peligroso por el momento. .Dia dos a siete...sabado a jueves El riesgo de corrientes marinas aumentara el sabado en la noche hasta el lunes en la noche, comenzando cerca de Crammer Park y extendiendose alrededor de las costas de Santa Cruz para el lunes y el lunes en la noche. Riesgo moderado de corrientes marinas existira para algunas playas de la costa sur de San John para el lunes. Indices de calor de 102 grados son posibles el sabado en Santa Cruz y el lunes en San John. Tronadas aisladas son posibles el sabado en la noche y temprano el domingo en la manana en las Islas Virgenes Estadounidenses. .Comunicado sobre informacion reportada por observadores... Activacion de observadores no sera necesario.
Special Weather Statement
National Weather Service San Juan PR
139 PM AST Fri Jun 7 2019
PRZ005-006-009-071945-
North Central-Central Interior-Western Interior-
139 PM AST Fri Jun 7 2019
...A STRONG THUNDERSTORM WILL AFFECT FLORIDA...ARECIBO...
BARCELONETA...JAYUYA...CIALES...AND UTUADO... MUNICIPALITIES...
At 137 PM AST, a strong thunderstorm was located between Florida,
Utuado and Arecibo. The storm is nearly stationary.
Winds in excess of 30 mph are possible with this storm.
Locations impacted include...
Arecibo, Jayuya, Florida, Utuado, Pajonal, Bajadero, La Alianza,
Imbery, Tiburones, Bufalo, Sabana Hoyos, Cayuco and Animas.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 1844 6654 1825 6645 1825 6651 1815 6652
1815 6655 1817 6657 1817 6659 1816 6663
1815 6663 1816 6666 1824 6673 1845 6674
TIME...MOT...LOC 1737Z 192DEG 3KT 1833 6661
CAMComunicado Especial de las Condiciones del Tiempo Servicio Nacional de Meteorologia San Juan PR 139 PM AST viernes 7 de junio de 2019 PRZ005-006-009-071945- NORTE CENTRAL-INTERIOR CENTRAL-OESTE INTERIOR- 139 PM AST viernes 7 de junio de 2019 ...UNA TRONADA FUERTE AFECTARA LOS MUNICIPIOS DE FLORIDA, ARECIBO, BARCELONETA, JAYUYA, CIALES Y UTUADO... A la 137 PM AST, una tronada fuerte estaba localizada sobre Florida, Utuado y Arecibo. La tronada estaba casi estacionaria. Vientos en exceso de 30 mph son posibles con esta tronada. Lugares impatactados incluye... Arecibo, Jayuya, Florida, Utuado, Pajonal, Bajadero, La Alianza, Imbery, Tiburones, Bufalo, Sabana Hoyos, Cayuco y Animas. Lluvias torrenciales tambien ocurren con esta tormenta y pudieran causar inundaciones localizadas. No maneje su vehiculo en areas inundadas. si esta al aire libre, busque refugio en un edificio o vehiculo. CAM/ERG
Special Weather Statement...CORRECTED
National Weather Service San Juan PR
241 PM AST Fri Jun 7 2019
PRZ005-006-009-071945-
North Central-Central Interior-Western Interior-
241 PM AST Fri Jun 7 2019
...STRONG THUNDERSTORMS AFFECTING PORTIONS ALONG AND TO THE NORTH
OF THE CORDILLERA CENTRAL...
At 2:41 PM AST, a line of strong thunderstorms were located from
San Sebastian to Corozal along the northern half of Puerto Rico.
These storms are slowly moving northward over coastal
municipalities of northern Puerto Rico. Additional thunderstorm
development expected within the next hour or so.
Winds in excess of 30 mph are possible with these storms.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through
flooded roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a
safe shelter inside a building or vehicle.
LAT...LON 1844 6654 1825 6645 1825 6651 1815 6652
1815 6655 1817 6657 1817 6659 1816 6663
1815 6663 1816 6666 1824 6673 1845 6674
TIME...MOT...LOC 1737Z 192DEG 3KT 1833 6661
CAMThe San Juan radar (TJUA), 89 km away, was scanning. The volume nearest the first event began at 18:46 UTC.
1 thunderstorm wind. Local standard time, as filed.
Winds from nearby strong thunderstorms caused damage to a house roof on Road PR-111 Barrio Pueblo Sector Sebruquillo.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2019Every state in 2019This day in weather historyWarnings in Puerto Rico, June 2019
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: 831483.