Puerto Rico, 2019

Flash Flooding and Debris Flows in Puerto Rico, September 24 to 25, 2019

September 24 to 25, 2019 · NWS SJU · 14 events in 11 counties and zones

Tropical Storm Karen formed just west of the Windward Islands in the eastern Caribbean Sea on September 22nd with 40 mph winds. It continued to move northward towards the area during the next couple of days with little change in strength.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
14

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.

What happened

The episode as NWS SJU wrote it up.

Tropical Storm Karen formed just west of the Windward Islands in the eastern Caribbean Sea on September 22nd with 40 mph winds. It continued to move northward towards the area during the next couple of days with little change in strength. Karen affected most of the area during the day on the 24th and into the early morning hours of the 25th. Main hazard associated with this storm was heavy rainfall, which created flooding and mudslides across several municipalities of the local area.

What forecasters said that day

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 24, 4:18 AM AST, 2 hours 7 minutes earlier.

Area forecast discussion, Sep 24, 4:18 AM AST, 2 hours 7 minutes before
Area Forecast Discussion
National Weather Service San Juan PR
418 AM AST Tue Sep 24 2019

.SYNOPSIS...
Increasing cloud cover and better organized convection were noted
over the eastern Caribbean waters in association with Tropical
Storm Karen. Doppler weather radar and recent satellite imagery
continue to show explosive deep convection associated with Karen
becoming more widespread and increasing over the past few hours.
Convective outflow and rainbands were also noted propagating
northwards and reaching parts of the islands from time to time.
Expect this activity to continue to increase and become more
frequent as Karen tracks north northwest across the forecast area
during the rest of the day into Wednesday.

A Flash Flood Watch remains in effect until Wednesday afternoon
for Puerto Rico and the U.S. Virgin Islands.

A Tropical Storm Warning is also in effect for Puerto Rico and
the U.S. Virgin Islands.

&&

.SHORT TERM...Today through Thursday...

The first rainbands of Karen were noted moving across the local
waters, with some of them making their way inland, overnight.
This activity is expected to continue and then to increase in
frequency and intensity as Karen moves closer during the morning.
GOES imagery and the Hurricane Hunter aircraft detected deep
convection increasing south of it center. The center of Karen is
still expected to move over or near Puerto Rico and the U.S.
Virgin Islands today. In the latest National Hurricane Center
intensity forecast, Karen makes landfall as a weak tropical storm
system. The main impacts associated with Karen are flooding
rains, winds, and hazardous marine conditions. Even though the
center of Karen will be over the Atlantic waters near northeast
Puerto Rico by this afternoon, flooding rains will likely continue
across PR and USVI through at least Wednesday. Therefore, a Flash
Flood Watch will be in effect until at least Wednesday evening.

Regardless of Karen's intensity, the system is expected to produce
rainfall accumulation totals between 2 and 4 inches of rain, with
isolated rainfall amounts up to 8 inches possible, mainly across
the southern and eastern sections of Puerto Rico, including the
mountainous terrain, Vieques, Culebra and the U.S. Virgin Islands.

Based on the latest model guidance, a wet pattern will persist over
Puerto Rico and the U.S. Virgin Islands through at least Thursday
with Total Precipitable Water values ranging between 2 and 2.5
inches.

.LONG TERM...Friday through Tuesday...

Moisture remnants from Tropical Storm Karen are forecast to be
gradually lifted north of the area by Friday; however, due to its
proximity, it will maintain a light southerly wind flow across
the area through Friday. This in turn will support a fairly moist
airmass persisting across the region and therefore favor the
development of afternoon convection across the islands. The next
tropical wave is forecast to push into the region Saturday through
Sunday, followed by decreasing moisture and improving weather
conditions on Monday and Tuesday.

Tropical Storm Lorenzo, which formed yesterday south of the Cape
Verde Islands, is currently forecast by the National Hurricane
Center to cross 20 north Saturday morning. This will be more than
1200 miles east of Puerto Rico, and this storm is currently not
expected to pose any direct threat to Puerto Rico or the U.S.
Virgin Islands.

&&

.AVIATION...VCSH/VCTS expected en route between PR and the Northern
Leeward Islands as the rainbands associated with TD Karen approaches
the area. Brief MVFR SCT-BKN lyrs nr FL022...FL050...FL090. Winds
light and variable bcmg...10-20 kts fm E-ESE with sea breeze
variations aft 24/14z. Please refer to the latest SIGMET as well as
NHC Advisory for TD KAREN.

&&

.MARINE...The recently upgraded TS Karen continues to track NNW
across the local Caribbean waters. Deteriorating seas and hazardous
marine conditions with squally conditions will be likely mainly
across the Caribbean waters and local passages. A tropical storm
warning remains in effect.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  90  76  91  78 /  80  80  60  50
STT  86  80  87  80 /  80  80  60  60

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...Flash Flood Watch through Wednesday afternoon for Central
     Interior-Culebra-Eastern Interior-Mayaguez and Vicinity-
     North Central-Northeast-Northwest-Ponce and Vicinity-San
     Juan and Vicinity-Southeast-Southwest-Vieques-Western
     Interior.

     Tropical Storm Warning for Central Interior-Culebra-Eastern
     Interior-Mayaguez and Vicinity-North Central-Northeast-
     Northwest-Ponce and Vicinity-San Juan and Vicinity-
     Southeast-Southwest-Vieques-Western Interior.

VI...Flash Flood Watch through Wednesday afternoon for St Croix-
     St.Thomas...St. John...and Adjacent Islands.

     Tropical Storm Warning for St Croix-St.Thomas...St. John...and
     Adjacent Islands.

AM...Flash Flood Watch through Wednesday afternoon for Coastal Waters
     of Southern Puerto Rico out 10 NM-Coastal Waters of
     Southern USVI Vieques and Eastern Puerto Rico out 10 NM.

     Tropical Storm Warning for Anegada Passage Southward to 17N-
     Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-
     Caribbean Waters of Puerto Rico from 10 NM to 17N-Coastal
     Waters of Northern Puerto Rico out 10 NM-Coastal Waters of
     Northern USVI and Culebra out 10 NM-Coastal Waters of
     Southern Puerto Rico out 10 NM-Coastal Waters of Southern
     USVI Vieques and Eastern Puerto Rico out 10 NM.

&&

SHORT TERM...RAM
LONG TERM....JA
Hazardous weather outlook, Sep 24, 5:20 AM AST, 1 hour 5 minutes before
Perspectivas sobre Condiciones Peligrosas del Tiempo
Servicio Nacional de Meteorologia San Juan PR
518 AM AST martes 24 de septiembre de 2019

AMZ710>745-PRZ001>013-251000-
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-
518 AM AST martes 24 de septiembre de 2019

Esta perspectiva sobre las condiciones peligrosas del tiempo es
para Puerto Rico y las aguas costeras adyacentes del Atlantico.

Favor referirse al Comunicado Local sobre Depresion Tropical Karen (HLSSPN).

AMZ715-725-VIZ001-002-251000-
San Tomas, San John y Islas Adyacentes-
Santa Cruz-Aguas cercanas del Atlantico y aguas costeras adyacente
del Caribe-
518 AM AST lmartes 24 de septiembre de 2019

Esta perspectiva sobre las condiciones peligrosas del tiempo es
para Puerto Rico y las aguas costeras adyacentes del Atlantico.

Favor referirse al Comunicado Local sobre Depresion Tropical Karen (HLSSPN).

The radar

The San Juan radar (TJUA), 29 km away, was scanning. The volume nearest the first event began at 10:24 UTC.

Open the radar archive at this moment

Event by event

8 flash flood, 5 debris flow, 1 flood. Local standard time, as filed.

Debris Flow, Barranquitas

When
September 24, 6:25 AM AST
Where
Barranquitas County, 3.04 mi SW of Barranquitas to 3.07 mi SW of Barranquitas
Cause
Heavy Rain
Reported by
911 Call Center
Coordinates
18.166, -66.349

Mudslide reported along road PR-723 km 5 at Barranquitas.

Debris Flow, Cayey

When
September 24, 6:30 AM AST
Where
Cayey County, 1.61 mi NW of Cayey to 1.64 mi NW of Cayey
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.117, -66.146

Mudslide reported along road PR-1 K.M 64 in Barrio La Paz.

Flash Flood, Bayamon

When
September 24, 1:51 PM AST to 2:45 PM AST
Where
Bayamon County, 3.57 mi NNE of Bayamon to 3.56 mi NNE of Bayamon
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.398, -66.150

Flooding was reported along Avenida Ongay behind San Pablo Hospital.

Flash Flood, Guaynabo

When
September 24, 2:00 PM AST to 2:45 PM AST
Where
Guaynabo County, 7.54 mi NW of Guaynabo to 7.41 mi NW of Guaynabo
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.410, -66.108

Flooding was reported along Martinez Nadal near Sector San Patricio.

Flood, Vega Baja

When
September 24, 3:04 PM AST
Where
Vega Baja County, 3.68 mi W of Vega Baja to 3.33 mi WSW of Vega Baja
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.441, -66.435

Flooding reported along road PR-2 near Sector Tortuguero.

Flash Flood, Jayuya

When
September 24, 4:27 PM AST to 9:00 PM AST
Where
Jayuya County, 1.27 mi NNW of Jayuya to 1.23 mi NNW of Jayuya
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.217, -66.587

Puente Caricaboa is impassable due to Rio Saliente out of its banks.

Flash Flood, Coamo

When
September 24, 9:00 PM AST to 11:00 PM AST
Where
Coamo County, 3.55 mi E of Coamo to 3.54 mi E of Coamo
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.078, -66.296

Emergency management reported 15 families trapped in their houses in Barrio Cuyon sector Cerrillos at Coamo. Cuyon River is out of its banks.

Debris Flow, Jayuya

When
September 24, 9:06 PM AST
Where
Jayuya County, 1.75 mi ENE of Jayuya to 1.85 mi ENE of Jayuya
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.209, -66.555

Mudslide reported along road PR-144 k.m. 11.5.

Flash Flood, Dorad

When
September 24, 9:27 PM AST to 11:30 PM AST
Where
Dorad County, 2.5 mi NNE of Dorado to 2.47 mi NNE of Dorado
Cause
Heavy Rain
Reported by
911 Call Center
Coordinates
18.465, -66.272

Flooding reported along calle Neptuno in Urbanization Dorado del Mar. One person trapped inside vehicle.

Flash Flood, Toa Baja

When
September 24, 9:31 PM AST to 11:30 PM AST
Where
Toa Baja County, 0.94 mi S of Toa Baja to 0.96 mi S of Toa Baja
Cause
Heavy Rain
Reported by
911 Call Center
Coordinates
18.417, -66.197

Flooding reporte along road PR-865 K.M. 3.2 in direction towards Gasolinera American.

Flash Flood, Toa Baja

When
September 24, 9:43 PM AST to 11:30 PM AST
Where
Toa Baja County, 1.53 mi WSW of Toa Baja to 1.54 mi SW of Toa Baja
Cause
Heavy Rain
Reported by
911 Call Center
Coordinates
18.418, -66.219

Flooding reported along calle Union after Iglesia Catolica Maria de Lourdes in Barrio Candelaria Arenas. Residence was flooded.

Flash Flood, Toa Baja

When
September 24, 9:53 PM AST to 11:30 PM AST
Where
Toa Baja County, 2.96 mi W of Toa Baja to 2.63 mi WSW of Toa Baja
Cause
Heavy Rain
Reported by
911 Call Center
Coordinates
18.422, -66.244

Flooding was reported at casa 4 in Calle Fortaleza at Barrio Campanilla. 2 people were trapped in the residence.

Debris Flow, Aibonito

When
September 25, 6:30 AM AST
Where
Aibonito County, 2.02 mi NNE of Aibonito to 1.85 mi NNE of Aibonito
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.145, -66.234

PREMA Aguas Buenas Zone Director reported that Aibonito PR-14, km 44. 9 segment was obstructed due to a landslide. No isolated communities. No life-threatening situations were reported.

Debris Flow, Guayama

When
September 25, 6:30 AM AST
Where
Guayama County, 3.52 mi WSW of Guayama to 3.48 mi WSW of Guayama
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
17.967, -66.182

Mudslide reported along road PR-713 k.m. 5.7 in Barrio Cimarrona.

What these are

Debris Flow
A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.
Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Puerto Rico in 2019Every state in 2019This day in weather historyWarnings in Puerto Rico, September 2019

Sources

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: 856309, 856318, 857068, 857069, 856273, 856275, 856276, 856277, 856278, 856279, 856280, 856281, 856321, 856322.