A tropical wave crossed the islands during the beginning of August, from Thursday, August 1st, through Saturday, August 3rd, which resulted in an unstable weather pattern. This weather scenario was enhanced by local topography, sea breeze variations, and afternoon effects typically observed in Puerto Rico, resulting in flooding and strong gusty winds due to thunderstorm activity.
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.
A tropical wave crossed the islands during the beginning of August, from Thursday, August 1st, through Saturday, August 3rd, which resulted in an unstable weather pattern. This weather scenario was enhanced by local topography, sea breeze variations, and afternoon effects typically observed in Puerto Rico, resulting in flooding and strong gusty winds due to thunderstorm activity.
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 Aug 1, 5:10 AM AST, 5 hours 50 minutes earlier.
Area Forecast Discussion National Weather Service San Juan PR 510 AM AST Thu Aug 1 2024 .SYNOPSIS... A unstable and wet pattern will persist today as the tropical wave moves west-northwestward across portions of the Greater Antilles. Today, there is a moderate to high potential of showers and thunderstorms across the region. Therefore, the risk of flooding is elevated to significant. Weather conditions are expected to improve by the weekend with the entrance of a drier airmass and slight concentrations of Saharan Dust. && .SHORT TERM...Today through Saturday... A robust tropical wave produced widespread shower and thunderstorm activity across Puerto Rico and its surrounding waters, while the U.S. Virgin Islands did not receive significant rain activity. Showers and thunderstorms affected most of PR overnight, with the maximum rainfall accumulations observed across the east, the San Juan Metropolitan area, and the south coast from Coamo to Guanica. The unstable and wet weather promotes nighttime cooling along the coastal and the low-elevation regions, where the minimum temperature finally dropped into the mid and upper 70s. Along the mountain areas, the lows were in the upper 60s. Winds were mainly from the east to east-southeast at 10 knots or less, but windy (20-30 mph) gusty winds were estimated near and around thunderstorms. The unstable and wet pattern will persist today as the tropical wave moves west-northwestward across portions of the Greater Antilles. For today, we expect favorable environmental conditions for the development of thunderstorms across the surrounding waters. The steering wind flow will dominate from the southeast, giving a moderate (40-50% chance) to a high chance (60-80% chance) of thunderstorms and showers moving across PR's south and east coast, crossing the islands. Therefore, we expect showery and stormy weather today, and you may experience strong thunderstorms producing frequent lightning, strong gusty winds, and flooding, especially during the morning and afternoon hours. Please exercise caution, especially in flood-prone areas. Although we can anticipate periods of calm weather with no rain from time to time, the unstable and wet pattern associated with the moisture field of the tropical wave will maintain a moderate to high chance of seeing showers and thunderstorms each day through at least Saturday. The above-normal sea surface temperatures around the islands may promote nighttime showers and thunderstorms each night, especially late tonight into early Friday morning. The risk of flooding will be elevated to significant, especially as soils continue to saturate and the river's streamflow runs above normal. On Saturday, the trailing tropical wave moisture will promote scattered-to-numerous overnight and morning passing showers across the windward sections. Then, the sea breeze, excessive heating, and local effects will enhance the afternoon convection across the mountains and downwind from them. The summer muggy heat index will also persist, especially across areas where rain does not affect them. .LONG TERM...Sunday through Thursday... Relatively calmer weather conditions will dominate the long-term period compared with the past week. An easterly perturbation is expected to move across the area by the weekend along with light to moderate concentrations of Saharan Air Layer. Patches of tradewind moisture will come along too, promoting the enhancement of shower activity over portions of the islands. This activity will be more focused over the western and northwestern portions of Puerto Rico due to the combination of southeasterly winds, diurnal heating and local effects. In addition, the San Juan streamer could bring showers into the San Juan metro area and adjacent municipalities. Across the U.S. Virgin Islands, fair weather conditions will dominate as well, with little or none precipitation over the islands. A continuation of the dry weather pattern is expected by mid-week, with the presence of a strong high pressure in the central Atlantic and the approach of another pulse of Saharan Air Layer. In response to the surface high pressure, the potential for heavy showers and thunderstorms will remain limited. However, a strong thunderstorm cannot be ruled out across the interior and western Puerto Rico during the afternoon hours. Warm temperatures will continue to prevail. With highs in the upper 80s to low 90s along the urban and coastal areas, and in the mid 80s elsewhere. Heat indices could reach over the 108 degrees Fahrenheit at times, leading to Heat Advisories or Excessive Heat Warning. Moving into the tropics, at this moment the latest model guidances (GFS & ECMWF) are not suggesting tropical development for the local area during the period. Nonetheless, please continue to monitor the Tropical Weather Outlooks (TWO) provided by the NWS National Hurricane Center (NHC) as we move into the peak of the Hurricane Season. && .AVIATION... (06Z TAFS) Expect SHRA/TSRA across the local terminals throughout the fcst period. Therefore, MVFR to brief IFR conditions are possible at any given time for all terminals (especially across JSJ/JPS this morning and afternoon, and at JBQ during the afternoon). However, VFR conditions will be observed at times. Mtn top obscd and low cigs expected along the Cordillera Central thru 01/23z. Calm to light and VRB winds thru 01/13z. Then winds will be mainly from the ESE/SE at 10-20 kt with higher gusty winds due to sea breeze and near TSRA. && .MARINE... A broad tropical wave will continue to cross the local area through today. This wave will continue to bring showers and thunderstorms along with locally higher seas and squally weather conditions across the regional waters and local passages through the end of the workweek. Increasing easterly winds will become moderate to fresh creating choppy to occasionally rough seas late in the workweek and into the weekend. && .BEACH FORECAST... There is a moderate risk of life-threatening rip currents along the northern and eastern beaches of Puerto Rico, including Culebra and St. Croix. && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && SHORT TERM...CAM LONG TERM....GRS
Perspectiva sobre las Condiciones Peligrosas del Tiempo Servicio Nacional de Meteorología San Juan PR 532 AM AST jueves 1 de agosto de 2024 AMZ711>745-PRZ001>013-020945- 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- 532 AM AST jueves 1 de agosto 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 dispersas posibles a través de las islas y las aguas circundantes. Planee detener toda la actividad al aire libre y moverse a refugios. .Lluvia Excesiva...Inundaciones en áreas urbanas, carreteras, riachuelos y lavados. Inundaciones repentinas amenazantes a la vida ingresando en estructuras y cortando vecindarios, especialmente en áreas propensas a inundaciones. .Calor Excesivo...Este nivel de calor afecta principalmente a aquellos individuos extremadamente sensibles al calor, especialmente cuando están al aire libre sin enfriamiento efectivo y/o hidratación adecuada. .Condiciones Marítimas...Las embarcaciones pequeñas deben ejercer precaución a través de las aguas regionales. .Corrientes Marinas...Corrientes marinas amenazantes a la vida son posibles en la zona de olas particularmente a lo largo de la costa norte. .DÍAS DOS A SIETE...viernes a miércoles La humedad posterior de la onda tropical promoverá condiciones inestables y húmedas hasta el viernes. Los vientos crecientes promoverán condiciones marinas picadas hasta peligrosas y riesgo de corrientes marinas de moderado a alto hasta principios de la próxima semana. Elevado a localizado el riesgo de calor excesivo regresará durante el fin de semana hasta principios de la próxima semana. .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-VIZ001-002-020945- San Thomas San John e islas adyacentes-Santa Cruz- Aguas cercanas a la costa del Atlántico y aguas costeras adyacentes del Caribe- 532 AM AST jueves 1 de agosto 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 a dispersas posibles a través de las aguas locales, moviéndose tierra adentro a veces. 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 principalmente a aquellos individuos extremadamente sensibles al calor, especialmente cuando están al aire libre sin enfriamiento efectivo y/o hidratación adecuada. .Condiciones Marítimas...Las embarcaciones pequeñas deben ejercer precaución a través de las aguas locales. .Corrientes Marinas...Corrientes marinas amenazantes a la vida son posibles en la zona de olas particularmente a lo largo de Santa Cruz. .DÍAS DOS A SIETE...viernes a miércoles La humedad posterior de la onda tropical promoverá condiciones inestables y húmedas hasta el viernes. Los vientos crecientes promoverán condiciones marinas picadas hasta peligrosas y riesgo de corrientes marinas de moderado a alto hasta principios de la próxima semana. Elevado a localizado el riesgo de calor excesivo regresará durante el fin de semana hasta principios de la próxima semana. .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.
Special Weather Statement
National Weather Service San Juan PR
1025 AM AST Thu Aug 1 2024
PRZ002-004-011515-
Northeast PR-Eastern Interior PR-
1025 AM AST Thu Aug 1 2024
...A STRONG THUNDERSTORM WILL IMPACT MUNICIPALITIES OF
NORTHEASTERN PUERTO RICO THROUGH 1115 AM AST...
At 1024 AM AST, Doppler radar was tracking a strong thunderstorm
near El Yunque, moving east-northeast at 15 mph.
HAZARD...Wind gusts up to 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Fajardo, Naguabo, Canovanas, Vieques, Humacao, Loiza, Luquillo, Rio
Grande, Ceiba, Anton Ruiz, Roosevelt Roads, Aguas Claras, Luis M.
Cintron, Ramos, Hato Candal, San Isidro, La Fermina, Campo Rico,
Suarez, and Santa Barbara.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in San Juan.
&&
LAT...LON 1843 6583 1837 6569 1839 6558 1838 6560
1834 6557 1836 6559 1837 6562 1835 6563
1827 6563 1825 6558 1823 6559 1819 6573
1807 6581 1812 6588 1823 6583 1827 6592
1841 6592 1846 6599
TIME...MOT...LOC 1424Z 240DEG 49KT 1834 6567
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
ICPComunicado Especial sobre las Condiciones del Tiempo
Servicio Nacional de Meteorologa San Juan PR
1025 AM AST jueves 1 de agosto de 2024
Noreste PR-Este Interior PR-
1025 AM AST jueves 1 de agosto de 2024
...UNA TORMENTA ELCTRICA FUERTE IMPACTAR LOS MUNICIPIOS DEL
NORESTE DE PUERTO RICO HASTA LAS 1115 AM AST...
A las 1024 AM AST, el radar Doppler estaba rastreando una tormenta
elctrica fuerte cerca de El Yunque, movindose del este-noreste a
15 mph.
PELIGRO...Rfagas de viento de hasta 40 mph.
FUENTE...Indicado por radar.
IMPACTO...Los vientos rfagas podran derribar ramas de rboles y
mover objetos no asegurados.
Las localidades afectadas incluyen...
Fajardo, Naguabo, Canvanas, Vieques, Humacao, Loiza, Luquillo, Ro
Grande, Ceiba, Anton Ruiz, Roosevelt Roads, Aguas Claras, Luis M.
Cintron, Ramos, Hato Candal, San Isidro, La Fermina, Campo Rico,
Suarez y Santa Barbara.
MEDIDAS DE PRECAUCIN/PREPARACIN...
Si est al aire libre, considere buscar refugio dentro de un
edificio.
Para informar sobre condiciones meteorolgicas severas, comunquese
con su agencia policial ms cercana. Ellos transmitirn su informe a
la oficina del Servicio Nacional de Meteorologa en San Juan.
&&
TAMAO DE GRANIZO MXIMO...0.00
EN RFAGA DE VIENTO MXIMO...40 MPH
ICP/MRRThe San Juan radar (TJUA), 33 km away, was scanning. The volume nearest the first event began at 15:00 UTC.
3 flood, 1 thunderstorm wind. Local standard time, as filed.
An emergency manager from Naguabo reported the closure of exit 22 on Road 53, leading to Road 31, due to river flooding from Rio Blanco.
Due to strong thunderstorms, Moca's emergency management reported a fallen tree on Road 444, near the baseball field, close to Carretera Nieves.
Strong thunderstorms developed in the northwest quadrant, causing flooding in the western Municipalities. A social media report showed a river flooding along road PR-125, kilometer 10.1, in Barrio Capa, Moca, towards Anasco.
Flooding rains caused by strong thunderstorms affected the northwest Municipalities. A social media post indicated minor flooding related to a water surge along a river that crossed a road near Barrio Saltos in San Sebastian, near a residential area.
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, August 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: 1207224, 1207226, 1207227, 1207228.