An upper level trough lingered in the region, promoting unsettled weather conditions. Additionally, a tropical wave approached, bringing plenty of moisture in the region.
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.
An upper level trough lingered in the region, promoting unsettled weather conditions. Additionally, a tropical wave approached, bringing plenty of moisture in the region. Widespread showers and thunderstorms were observed across Puerto Rico, with rainfall accumulations of 1 to 3 inches each day, and maximum amounts up to 5 inches. This led to several reports of mudslides, lightning, and flooding.
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 Sep 8, 3:46 PM AST, 14 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 346 PM AST Sun Sep 8 2024 .SYNOPSIS... Expect shower and thunderstorm activity during the next few days as the tropical upper tropospheric trough (TUTT) and a broad tropical wave continues to move across the area. Southeasterly winds and a high- moisture environment will also contribute to excessive heat risks. The National Hurricane Center (NHC) is monitoring an area, currently in the central tropical Atlantic, with a medium cyclonic formation chance in the next 48 hours and a high formation chance in the next seven days. && .SHORT TERM...Today through Tuesday... Doppler radar observed isolated shower activity across eastern Puerto Rico and the U.S. Virgin Islands in the morning. Around 10 AM, more well-developed showers began streaming across the eastern sections of Puerto Rico, affecting Luquillo, Rio Grande, and Fajardo. Afterward, the shower activity started to develop across most of the eastern sections of Puerto Rico, the interior, and the northwestern regions. Intense shower activity resulted in rainfall accumulations between 1 and 3 inches, with the highest amount observed in San Sebastian, where radar estimates indicated around 3 inches. Although cloud cover persisted throughout the morning, maximum temperatures climbed into the upper 80s to lower 90s, with heat indices ranging from 108 to 110 degrees particularly along the southern coastal areas. Unsettled and wet weather conditions will prevail for the rest of the forecast period. The upper-level low will continue to linger across the islands, resulting in an unstable pattern conducive to the development of showers. Meanwhile, at the surface, a tropical wave moving westward into the region will provide abundant moisture, with PWAT values of 2.1 inches as indicated by derived GOES satellite images. This combination will trigger active afternoon showers and variable weather conditions during the late and early morning hours. Given these expected conditions, the risk of excessive rainfall will remain elevated, mainly for Puerto Rico. Saturated soils could lead to localized flash flooding and mudslides, particularly in small streams, creeks, and areas of steep terrain. Residents and visitors should exercise caution or avoid outdoor activities during the afternoon. Across the U.S. Virgin Islands, minor flooding may occur on roads and in poor drainage areas as shower activity increases. Temperature-wise, the islands can expect warmer conditions, with maximum temperatures in the upper 80s to lower 90s across most urban and coastal areas. Heat indices could exacerbate health issues, particularly in vulnerable populations. Given the forecast conditions, heat advisories and warnings are likely to be issued. && .LONG TERM...Wednesday through Sunday... //from previous discussion// An upper level trough will be present northeast of the local islands to start the period, before gradually weakening throughout the workweek. By the end of the week, a mid-level ridge will reduce instability aloft. Precipitable water (PWAT) values will continue mainly above 2.1 inches for the start of the period, above normal values for this time of the year. East to east-southeast winds will aid in providing moisture to the area. Expect variable weather conditions as local, orographic and diurnal effects generates afternoon convective activity, increasing the risk of flooding during the afternoon for sectors of interior and western Puerto Rico. Lines of convection (showers and thunderstorms) can also develop from the USVI, Vieques, Culebra, and from El Yunque. Periods of passing overnight and early morning showers are also forecast across windward sectors of the islands. With available moisture and east to east-southeast winds, heat indices in coastal, urban and lower elevation areas can reach above 108 degrees Fahrenheit. The Climate Prediction Center's (CPC) Global Tropics Hazards Outlook indicates a greater than 50% probability of above-average rainfall across the northeastern Caribbean during the period. The National Hurricane Center (NHC) is monitoring an area, currently in the central tropical Atlantic, with a medium cyclonic formation chance through the next seven days. While it's too early to assess any potential impact on our forecast area, please continue to remain vigilant and monitor future forecast updates from the NHC and from WFO San Juan. && .AVIATION... (18z) SHRA and TSRA are resulting in MVFR conditions across all TAF sites. Winds will continue from the E-SE at up to 15 knots with gusts. TSRA and SHRA may lead to lower ceilings across the mountains and reduced visibility. Another round of SHRA with TS is forecast for all eastern TAF sites from 09/09Z to 09/15Z. && .MARINE... A surface high pressure across the Atlantic will promote gentle to moderate easterly winds over the next few days. An upper-level trough to our north and a broad tropical wave moving in from the east will boost shower and thunderstorm activity during the next few days. Thunderstorms will affect the coastal waters of western Puerto Rico each afternoon. && .BEACH FORECAST... A moderate rip current risk is present along the northern and eastern-facing beaches of Puerto Rico and Culebra. Low risk elsewhere, however, life-threatening rip currents often occur in the vicinity of groins, jetties, reefs, and piers. && .SJU WATCHES/WARNINGS/ADVISORIES... PR...Heat Advisory until 4 PM AST this afternoon for PRZ011. VI...None. AM...None. && SHORT TERM...LIS/WS LONG TERM...MRR AVIATION...LIS/WS PUBLIC DESK...MMC/RVT
Perspectiva sobre las Condiciones Peligrosas del Tiempo Servicio Nacional de Meteorología San Juan PR 448 AM AST domingo 8 de septiembre de 2024 AMZ711>745-PRZ001>013-091000- San Juan y Vecindad-Noreste-Sureste-Este Interior- Norte Central-Central Interior-Ponce y Vecindad-Noroeste- Oeste Interior-Mayagüez y Vecindad-Suroeste-Culebra-Vieques- Las aguas cercanas y fuera de la costa del Atlántico y del Caribe- 448 AM AST domingo 8 de septiembre de 2024 Esta perspectiva sobre las condiciones peligrosas del tiempo es para sectores de Puerto Rico. .DÍA UNO...Hoy y esta noche .Rayos...Tormentas eléctricas de aisladas a dispersas son posibles. Planee detener toda la actividad al aire libre y moverse a refugios. .Lluvia Excesiva...Inundaciones en áreas urbanas, carreteras, riachuelos y lavados. Inundaciones repentinas aisladas son posibles. .Calor Excesivo...Este nivel de calor afecta a la mayoría de los individuos sensibles al calor, especialmente aquellos sin enfriamiento efectivo y/o hidratación adecuada. Impactos posibles en algunos sistemas de salud y en industrias sensibles al calor. .Condiciones Marítimas...Las embarcaciones pequeñas deben ejercer precaución a través de sectores de las aguas fuera de las 10 millas nauticas del Atlántico. .Corrientes Marinas...Corrientes marinas amenazantes a la vida son posibles en la zona de olas rompientes, particularmente a través del norte de Puerto Rico y Culebra. .DÍAS DOS A SIETE...lunes a sábado Contenido de humedad muy por encima de lo normal y las condiciones inestables ayudarán al desarrollo de tormentas eléctricas en los próximos días, manteniendo el riesgo de lluvia excesiva y rayos. Mientras tanto, los vientos del sureste y un ambiente de alta humedad producirán riesgos de peligro de calor excesivo. Un riesgo moderado de corrientes marinas persistirá. .COMUNICADO SOBRE INFORMACIÓN DE OBSERVADORES... Se les exhorta a los observadores a reportar. Favor de reportar cualquier información sobre inundaciones, vientos, olas y corrientes marinas al Servicio Nacional de Meteorología en San Juan. AMZ716-726-VIZ001-002-091000- San Thomas San John e islas adyacentes-Santa Cruz- Aguas cercanas a la costa del Atlántico y aguas costeras adyacentes del Caribe- 448 AM AST domingo 8 de septiembre de 2024 Esta Perspectiva sobre las Condiciones Peligrosas del Tiempo es para sectores de las Islas Vírgenes Americanas. .DÍA UNO...Hoy y esta noche .Rayos...Tormentas eléctricas aisladas son posibles. Esté atento a las tormentas eléctricas en su área y esté preparado para buscar refugio. .Lluvia Excesiva...Inundaciones en áreas urbanas, carreteras, riachuelos y lavados. Inundaciones repentinas aisladas posibles. .Calor Excesivo...Este nivel de calor afecta a la mayoría de los individuos sensibles al calor, especialmente aquellos sin enfriamiento efectivo y/o hidratación adecuada. Impactos posibles en algunos sistemas de salud y en industrias sensibles al calor. .Condiciones Marítimas...Las embarcaciones pequeñas deben ejercer precaución a través de sectores de las aguas fuera de las 10 millas nauticas del Atlántico. .DÍAS DOS A SIETE...lunes a sábado Muy por encima del contenido de humedad y las condiciones inestables apoyarán el desarrollo de tormentas eléctricas en los próximos días, manteniendo el riesgo de lluvia excesiva y rayos. Mientras tanto, los vientos del sureste y un ambiente de alta humedad producirán riesgos de peligro de calor excesivo. Un riesgo moderado de corrientes marinas regresará para Santa Cruz el lunes. .COMUNICADO SOBRE INFORMACIÓN DE OBSERVADORES... Se les exhorta a los observadores a reportar. Favor de reportar cualquier información sobre inundaciones, vientos, olas y corrientes marinas al Servicio Nacional de Meteorología en San Juan.
The San Juan radar (TJUA), 30 km away, was scanning. The volume nearest the first event began at 20:02 UTC.
14 flood, 4 flash flood, 2 debris flow, 1 lightning. Local standard time, as filed.
A member of the public reported on social media that Road 31 in Naguabo is being affected by flooding due to Rio Blanco overflowing since around 1 to 2.30 inches have fallen.
The Emergency Manager director from Jayuya reported a landslide at PR-140 in direction from Adjuntas (south) to Jayuya. The main road has a sinkhole, and it was described to be in very bad shape. One lane remained open and heavy traffic was not permitted.
A picture in social media showed flooding at PR-102, intersection Calle Rafael Hernandez, close to the McDonalds. The road was almost impassable.
A member of the public reported that Avenue Esmeralda is completely affected by flooding.
A member of the public reported that Road Olympic in Summit Hills is being affected by flooding.
A member of the public reported that Calle Los Robles in Urb. Sierra Linda is being affected by flooding.
Road PR-19 near a Shell Gas Station was impassable due to flooding from Quebrada Margarita.
A member of the public reported that the marginal between PR-100 and El Meson restaurant in Cabo Rojo was flooded.
A lightning stroke a wall at Galeria 100 Shopping Center in Cabo Rojo. The pictures indicated a small hole was left on the wall.
Flooding was reported at PR-308 near Urb. Girasol.
The exit toward Highway Martinez Nadal was impassable due to flooding.
A landslide was reported at PR-393. The rocks were covering the road completely.
A member of the public reported that PR-177 from Bayamon to Guaynabo near Santa Maria Shopping Center is being affected by flooding.
Broadcast media reported via social media partial flooding on PR-1 near Milla de Oro, close to MCS, directly in front of Boveda Restaurante. Some lanes were impassable, but vehicles were still able to pass through the available lane, albeit with some difficulty.
A 911 reporter informed that Calle 88 in Carolina is being affected by flooding.
A stranded car due to flooding was reported in Calle Junin, Intersection with Calle 1.
An NWS employee reported heavy traffic at Ave Iturregui, in the traffic light in front of Ciudad Deportiva, due to flood waters making the road almost impassable.
Adjuntas. Adjuntas OMME Director reported a creek out of its banks in Barrio Tanama Sector Valle along PR-526 in Adjuntas near Barra El Valle.
Broadcast media reported flooding along Avenue Luis Munoz Rivera, right in front of El Hipopotamo restaurant. The road looked almost impassable with cars crossing with difficulty.
Fajardo OMME Director informed of a water surge from Rio Fajardo, flooding PR-194 near Iglesia Bautista Nueva Jerusalem. The road was closed due to water overpassing the bridge.
A car was stranded at PR-114 as flooding waters from Rio Guanajibo continued to cover the road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2024Every state in 2024This day in weather historyWarnings in Puerto Rico, September 2024
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: 1216721, 1216740, 1216739, 1216725, 1216726, 1216727, 1216728, 1216729, 1216738, 1216730, 1216731, 1216741, 1216732, 1216733, 1216734, 1216722, 1216723, 1216724, 1216735, 1216736, 1216737.