Deep tropical moisture over the area resulted in enhanced shower and thunderstorm activity across several portions of Puerto Rico.
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.
Deep tropical moisture over the area resulted in enhanced shower and thunderstorm activity across several portions of Puerto Rico.
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 May 27, 11:08 AM AST, 2 hours 2 minutes earlier.
Area Forecast Discussion
National Weather Service San Juan PR
1108 AM AST Mon May 27 2019
.UPDATE...
Minor changes made to the inherited short term forecast Pops and and
WX grids due to increasing moisture and showers and isolated thunderstorm
development. Expect this very moist and unstable environment to continue
across the region during the rest of the day and through at least
Tuesday as mentioned in the previous discussion. The potential for
urban and small stream flooding will therefore remain high for the
rest of today, due to showers and thunderstorm development with periods
of heavy rainfall across the forecast area. Mudslides in areas of
steep terrain will also be possible especially where afternoon rainfall
has been persistent in recent days. Also rivers and streams in these
areas across the central and west sections of PR will quickly react
with additional moderate to heavy rains.
A Flood advisory has been issued and remains in effect at least
until 12:45 pm AST for the Guajataca river and all tributaries
due to a dam floodgate release of water.
&&
.AVIATION UPDATE...No sig change to previous AVN discussion.
Prevailing VFR but brief MVFR conds in SHRA/ Isold TSRA en route
btw islands and with periods of Low CIG/SHRA ovr Ctrl mountain
range and East interior sectionS of PR. SCT-BKN lyrs nr FL025...
FL050...FL080. Wdly sct SHRA/ Isold TSRA ovr Flying area. Tempo
MVFR psbl at TJNR/TJSJ/TJMZ/TJBQ fm 27/16Z-27/23z.
&&
.MARINE UPDATE...No change to previous short term marine
discussion at this time.
&&
.PREV DISCUSSION... /issued 455 AM AST Mon May 27 2019/
SYNOPSIS...Surface high pressure across the western Atlantic is
slowly moving east, to the north of the local islands. There is a
stronger surface high pressure across the northeastern Atlantic.
This setup is causing a light to moderate southeasterly winds.
Higher than normal available moisture is expected to move in
today, and linger through most of the workweek. Upper trough will
cause an increase in instability mid to late this week. A rainy
weather pattern is expected this week.
SHORT TERM...Today through Wednesday....
A wetter pattern is forecast to persist through the short-term
period, as a result of deep layered tropical moisture out of the
Caribbean pooling across Puerto Rico and the U.S. Virgin Islands.
During this time precipitable water values will range from 1.9 to
2.2 inches across the region. Also, scattered to numerous showers
are forecast to develop each day during the afternoon. Rainfall
amounts each day will range from 0.50 to 1.00 inches with higher
amounts in isolated areas. Additionally, soils are saturated from
previous days rainfall and any additional rainfall could lead to
urban and small stream flooding, as well as, ponding of water on
roadways.
This morning moderate to heavy rainfall fell across portions of
northwestern, eastern, interior of Puerto Rico. Elsewhere, light to
moderate showers were observed across the U.S. Virgin Islands and
other parts of Puerto Rico. Later this morning light to moderate
showers are possible across portions of eastern Puerto Rico and the
U.S. Virgin Islands through mid morning. Then scattered to numerous
showers and isolated thunderstorms are forecast to develop over the
interior, and western areas of Puerto Rico this afternoon. These
showers will develop as a result of significant surface heating,
abundant low-level moisture and local effects. Also, a weak jet to
the north of Puerto Rico will provided modest upper-level
instability today which will aid in showers and isolated
thunderstorm development.
Tuesday, weak troughiness develops to the northwest of Puerto Rico
and is expected to continue to deepen north of the area through
Wednesday. Tuesday and Wednesday scattered showers and isolated
thunderstorms are forecast to develop during the afternoon across
most areas of Puerto Rico. The combination of deep layered tropical
moisture through the entire atmospheric column, increasing
instability as a result of a developing low-level jet and deepening
upper-level trough will induce showers and isolated thunderstorms.
In addition, local and diurnal effects will help aid in showers and
isolated thunderstorm develop. Therefore, moderate to heavy rainfall
is likely during the afternoon for most of the island.
However, current guidance shows that mid to upper-level clouds might
linger during the early mornings through mid afternoon across
eastern, interior and western areas of Puerto Rico. If these clouds
develop they will limit surface heating and delay shower and
thunderstorm development.
LONG TERM...Thursday through Tuesday...
The deep moisture is expected to linger into Thursday, so at least
some widely scattered to numerous showers and isolated
thunderstorms are expected during the day. However, slightly drier
air is expected to move in for Friday, which could cause a
decrease in shower activity over the local area. That said, there
is an upper trough with axis just to our west for Friday, which
will increase instability, but the models have been somewhat
inconsistent on the exact location to the jury is still out on
this. Next weekend looks like it will be rainy, the available
moisture will be near or slightly above normal and we may have the
upper tough still over the general area, so enhanced shower and
thunderstorm activity is possible in the afternoons over Puerto
Rico with scattered showers elsewhere.
AVIATION...VFR conds are forecast to continue across all terminal
sites through 27/16Z with an occasional iso/sct SHRA. This afternoon
SHRA/Isold TSRA mainly ovr ctrl and W PR and vcty
TJSJ/TJMZ/TJBQ/TJNR til 28/03. Sfc winds out of the east at 10 to 15
kts with sea breeze variations.
MARINE...Seas will be up to 5 feet today with winds up to 15
knots, but a northerly swell is expected to move in tonight,
causing the local seas to increase up to 6 feet across the
Atlantic waters. There is a moderate risk of rip currents today,
but a high risk is expected starting this evening across the
northwest to northeast beaches of Puerto Rico, north beaches of
Culebra and Saint Thomas.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 88 77 87 75 / 50 40 50 60
STT 86 77 85 76 / 60 30 40 60
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...High Rip Current Risk from 6 PM AST this evening through Tuesday
afternoon for Culebra-Mayaguez and Vicinity-North Central-
Northeast-Northwest-San Juan and Vicinity-Southeast.
VI...High Rip Current Risk from 6 PM AST this evening through Tuesday
afternoon for St.Thomas...St. John...and Adjacent Islands.
AM...High Rip Current Risk from 6 PM AST this evening through Tuesday
afternoon for Coastal Waters of Southern USVI Vieques and
Eastern Puerto Rico out 10 NM.
&&
SHORT TERM...RAM
LONG TERM....RAMPerspectivas sobre Condiciones Peligrosas del Tiempo Servicio Nacional de Meteorologia San Juan PR 439 AM AST lunes 27 de mayo de 2019 AMZ710>745-PRZ001>013-280845- 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- 439 AM AST lunes 27 de mayo de 2019 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...Existe la probabilidad de tronadas con lluvia fuerte y vientos en rafagas de corta duracion a traves de sectores del centro, norte central, oeste y noroeste de Puerto Rico. Estas tronadas pudieran causar vientos en rafaga fuertes. .Inundaciones...Fuertes lluvias pudieran causar inundaciones urbanas y de riachuelos. .Corrientes marinas...Existe riesgo moderado de corrientes marinas para las playas del norte de Puerto Rico, Vieques y Culebrita. Se espera riesgo alto tarde en la noche al martes en la manana para las playas del norte de Puerto Rico. .Dia dos a siete...martes a domingo Se esperan aguaceros y tronadas hasta mediados de semana. Estos aguaceros y tronadas pudieran producir lluvia de moderada a fuerte que pudiera resultar en inundaciones urbanas y de riachuelos. Se espera riesgo alto de corrientes marinas para las playas del norte de Puerto Rico tarde el martes. .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-VIZ001-002-280845- San Tomas, San John y Islas Adyacentes- Santa Cruz-Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 439 AM AST lunes 27 de mayo 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 .Inundaciones...Lluvia fuerte pudiera resultar en inundaciones urbanas y de riachuelos. .Corrientes marinas... Existe riesgo moderado de corrientes marinas para las playas del norte de San Thomas. .Dia dos a siete...martes a domingo Aguaceros y tronadas son posibles hasta el jueves. Estos aguaceros y tronadas pudieran producir lluvia de moderada a fuerte que pudiera resultar en inundaciones urbanas y de riachuelos. Se pronostica riesgo moderado de corrientes marinas para los proximos dias. .Comunicado sobre informacion reportada por observadores... Informacion reportada por observadores no sera necesaria.
The national radar mosaic for the moment the first event began.
3 flood, 1 debris flow. Local standard time, as filed.
Bridge at Road PR-836 was closed. This is located near the Agrocentro Camarones and the Food Palace Bakery.
Four cars trapped due to flood waters near Banco Popular in Avenida Lomas Verdes.
Flooding due to poor drainage in the interesection of Daguey Street and Road PR-402 in the Urbanization of Jardines.
Mudslide was reported Road PR-140 near Barrio Tetuan, leaving 12 families uncommunicated.
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, May 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: 826900, 826902, 826903, 826904.