A strong tropical wave moved across the region producing heavy rainfall and thunderstorm activity.
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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.
A strong tropical wave moved across the region producing heavy rainfall and 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 16, 4:38 PM AST, 4 hours 42 minutes earlier.
Area Forecast Discussion
National Weather Service San Juan PR
438 PM AST Wed Aug 16 2017
.SYNOPSIS...A tropical wave just across the eastern Caribbean
will move across the forecast area tonight through Thursday. TUTT
low will continue just to the west- northwest of the forecast area
through Friday as an upper ridge builds from the north. Saharan
air layer will gradually diminish tonight ahead of the tropical
wave.
&&
.SHORT TERM...Tonight through Friday...
A mid to upper level ridge is expected to build across the
forecast area Thursday night, as a trough aloft/TUTT across the
northeast Caribbean shifts westward. At lower levels, a broad
high pressure across the central Atlantic will continue to produce
a moderate to fresh easterly winds through the forecast period.
An active tropical wave across the Lesser Antilles this afternoon
will continue to move westward moving across the local islands
tonight and Thursday. The moisture associated with the leading
edge of the wave in combination with daytime heating and local
effects will continue to induce the development of shower and
thunderstorm activity across the U.S. Virgin Islands, Vieques,
Culebra, Puerto Rico and the surrounding waters for the rest of
this afternoon and evening. The chance for showers and thunderstorms
will increase across the forecast area tonight into Thursday due
to the proximity of TUTT low and the tropical wave moving across
the local islands.
Urban and small stream flooding likely. Shower and thunder
development across west Puerto Rico Thursday afternoon will be
dependent on cloud cover. As the tropical wave moves away and an
upper level ridge builds, a fair weather pattern is then expected
to prevail on Friday.
.LONG TERM...Saturday through Wednesday...PREVIOUS DISCUSSION...
In the medium range, an area of low pressure near 48W longitude,
which the National Hurricane Center is giving a 40% chance of
formation during the next 5 days...is forecast to move across the
Caribbean Sea between Friday and Saturday...and remain south of
the islands. Another area of low pressure near 35W longitude,
that NHC is also giving a 40% chance of formation during the next
5 days, is currently expected to move close to the forecast area
late in the weekend. In the long range, latest runs of both GFS
and ECMWF runs indicated a surface low pressure area passing well
to the northeast of the forecast area by midweek.
&&
.AVIATION...Approaching tropical wave is bringing SHRA/TSRA to the
local area. Intermittent brief moment of SHRA/TSRA over the local
terminals is expected, some of which could cause at least MVFR conds
for brief moments at a time. Mainly VCSH/VCTS written on TAF due to
uncertainty on timing, AMD with TEMPO as necessary. Winds will
remain at about 15-20KT with occasional gusts. CIGS will be at about
FL040 but lower in SHRA/TSRA. Wx conditions across the local
terminals to be unsettled through Thursday night.
&&
.MARINE...Seas are expected to increase tonight between 6-8 feet
across the Anegada Passage and across both Atlantic and Caribbean
offshore waters through at least Thursday. Small craft advisories
are in effect. East to northeast winds between 15 to 20 knots will
prevail tonight. Squally weather is possible tonight and Thursday
as the wave moves across the local area. A high risk of rip
currents is in effect for northwest and north central beaches of
Puerto Rico and for St. Croix.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 79 88 80 87 / 60 60 20 20
STT 80 89 80 92 / 60 60 30 20
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...High Rip Current Risk through late tonight for North
Central- Northwest Puerto Rico.
VI...Small Craft Advisory from 8 PM this evening to 8 PM AST Thursday
for St.Thomas...St. John...and Adjacent Islands.
High Rip Current Risk through late tonight for St Croix.
AM...Small Craft Advisory until 8 PM AST Thursday for Anegada Passage
Southward to 17N-Atlantic Waters of Puerto Rico and USVI
from 10 NM to 19.5N.
Small Craft Advisory from 8 PM this evening to 8 PM AST Thursday
for Coastal Waters of Northern USVI and Culebra out 10 NM-
Coastal Waters of Southern USVI Vieques and Eastern Puerto
Rico out 10 NM.
Small Craft Advisory from 8 PM this evening to 2 PM AST Thursday
for Caribbean Waters of Puerto Rico from 10 NM to 17N-Mona
Passage Southward to 17N.
Small Craft Advisory from 2 AM to 2 PM AST Thursday for Coastal
Waters of Northern Puerto Rico out 10 NM.
&&
SHORT TERM...99
LONG TERM....JF
AVIATION.....FCPerspectivas sobre condiciones peligrosas del tiempo Servicio Nacional de Meteorologia San Juan PR 649 PM AST miercoles 16 de agosto de 2017 AMZ710>745-PRZ001>013-172300- 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- 649 PM AST miercoles 16 de agosto de 2017 Esta perspectiva sobre las condiciones peligrosas del tiempo es para Puerto Rico y las aguas costeras adyacentes del Atlantico. .Dia uno...Esta noche .Tronadas...Existe la probabilidad de tronadas con lluvias fuertes y breves rafagas de viento esta noche a traves de porciones del este y suroeste de Puerto Rico asi como a traves de Vieques y Culebra. .Inundaciones...Lluvias fuertes podrian resultar en inundaciones urbanas y de riachuelos. .Viento...Vientos sostenidos en exceso de 20 mph son posibles a traves de la mayoria de las aguas locales al igual que Vieques y Culebra. .Olas...Se espera oleaje entre 7 y 9 pies mayormente a traves de las aguas mar afuera del Atlantico y Caribe. .Corrientes marinas...Existe un riesgo alto de corrientes marinas para las playas del noroeste hasta norte central de Puerto Rico. .Dias dos a siete...jueves a martes Se pronostica que una onda tropical continuara afectando el area local el jueves, aumentando el potencial de tronadas e inundaciones urbanas y de riachuelos sobre porciones de las islas, particularmente el este de Puerto Rico. Se espera que el riesgo moderado a alto de corrientes marinas continue a traves de porciones de la costa este, norte y sur de las islas durante los proximos dias. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores, sin embargo, se exhorta a los observadores a reportar inundaciones y corrientes marinas a la oficina del Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-172300- San Tomas, San John e Islas Adyacentes-Santa Cruz- Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 649 PM AST miercoles 16 de agosto de 2017 Esta perspectiva sobre las condiciones del tiempo peligrosas es para Puerto Rico y las aguas costeras adyacentes del Atlantico. .Dia uno...Esta noche .Tronadas...Existe la probabilidad de tronadas con lluvias fuertes y breves rafagas de viento esta noche a traves de las islas locales. .Inundaciones...Lluvias fuertes podrian resultar en inundaciones urbanas. .Viento...Vientos sostenidos en exceso de 20 MPH son posibles a traves de la mayoria de las islas locales y las aguas circundantes. .Olas...Se espera oleaje entre 7 y 9 pies mayormente a traves de las aguas mar afuera del Atlantico y Caribe. .Corrientes marinas...Existe un riesgo alto de corrientes marinas para las playas Salt River y Cramer Park en Santa Cruz. .Dias dos a siete...jueves a martes Se pronostica que una onda tropical continuara afectando el area local el jueves, aumentando el potencial de tronadas e inundaciones urbanas sobre porciones de las islas. Se espera que el riesgo moderado a alto de corrientes marinas continue particularmente a traves de Santa Cruz. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion generalizada de observadores, sin embargo, se exhorta a los observadores a reportar corrientes marinas a la oficina del Servicio Nacional de Meteorologia en San Juan.
The San Juan radar (TJUA), 18 km away, was scanning. The volume nearest the first event began at 01:19 UTC.
1 thunderstorm wind. Local standard time, as filed.
A fallen tree over power lines was reported at Barrio Guardarraya, Lamboglia sector at PR-3, KM 119.4.
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, August 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: 718937.