Puerto Rico, 2021Flash Flooding and Debris Flows in Puerto Rico, October 13 to 16, 2021
October 13 to 16, 2021 · NWS SJU · 12 events in 4 counties and zones
A surface low located north of the area resulted in southerly winds and dragged plenty of moisture into the area for several days. This feature also resulted in weak steering flow.
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
- Deaths
- 0
- Injuries
- 0
- Property damage
- $4,000
- Crop damage
- None recorded
- Events
- 12
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.
A surface low located north of the area resulted in southerly winds and dragged plenty of moisture into the area for several days. This feature also resulted in weak steering flow. This aided in the generation of slow-moving shower and thunderstorm activity each afternoon across various sectors of Puerto Rico.
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 Oct 13, 10:55 AM AST, 3 hours 35 minutes earlier.
Area forecast discussion, Oct 13, 10:55 AM AST, 3 hours 35 minutes before
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</html>Hazardous weather outlook, Oct 13, 3:54 AM AST, 10 hours 36 minutes before
Perspectivas sobre las Condiciones Peligrosas del Tiempo
Servicio Nacional de Meteorologia en San Juan PR
352 AM AST miercoles 13 de octubre de 2021
AMZ710>745-PRZ001>013-140800-
San Juan y Vecindad-Noreste-Sureste-
Este Interior-Norte Central-Interior Central-Ponce y Vecindad-
Noroeste-Oeste Interior-Mayaguez y Vecindad-Suroeste-Culebra-Vieques-
Las aguas costeras cercanas y lejanas a la costa del Atlantico y
Caribe-
352 AM AST miercoles 13 de octubre de 2021
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 una probabilidad de tronadas con lluvia
fuerte y vientos en rafaga esta tarde a traves de la mayoria del
area.
.Inundaciones...Lluvia fuerte pudiera resultar en inundaciones
urbanas y de pequenos riachuelos.
.Oleaje...Se espera oleaje picado de hasta 7 pies a traves de
sectores de las aguas expuestas del Atlantico y hasta 6 pies en el
resto del area.
.Corrientes marinas...Existe un riesgo alto de corrientes
marinas para todas las playas del norte de Puerto Rico y para todo
Culebra. Existe riesgo moderado de corrientes marinas para las
playas de Rincon y Aguada, el sureste y para Vieques.
.Dias dos hasta el siete...jueves a martes
El riesgo de inundaciones urbanas y de riachuelos por aguaceros y
troandas continuara por el resto de la semana laboral. El riesgo
moderado de corrientes marinas continuara hasta el viernes.
.Comunicado sobre informacion reportada por observadores...
No se espera activacion amplia de observadores. Favor de reportar
cualquier informacion sobre inundaciones, vientos, oleaje y
corrientes marinas al Servicio Nacional de Meteorologia en San Juan
mientras siguen las indicaciones de las autoridades locales y
estatales.
AMZ710>745-PRZ001>013-140800-
San Tomas, San John e Islas Adyacentes-
Santa Cruz-Aguas cercanas del Atlantico y aguas costeras adyacentes
del Caribe-
352 AM AST miercoles 13 de octubre de 2021
Esta perspectiva sobre las condiciones peligrosas del tiempo es para
Islas Virgenes Estadounidenses y las aguas costeras adyacentes.
.Dia Uno...Hoy y esta noche
.Tronadas...Existe una probabilidad de tronadas con lluvia
fuerte con rafagas de viento esta tarde a traves de las islas.
.Inundaciones...Lluvia fuerte pudiera resultar en inundaciones
urbanas y de cunetas a traves de la region.
.Oleaje...Se espera oleaje picado de hasta 7 pies a traves de
sectores de las aguas expuestas del Atlantico y hasta 6 pies en el
resto del area.
.Corrientes marinas...Existe un riesgo moderado de corrientes
marinas para todas las playas.
.Dias dos hasta el siete...jueves a martes
El riesgo de aguaceros y tronadas continuara hasta al menos finales
de semana. El riesgo moderado de corrientes marinas hasta el jueves.
.Comunicado sobre informacion reportada por observadores...
No se espera activacion amplia de observadores. Favor de reportar
cualquier informacion sobre vientos, oleaje y corrientes marinas al
Servicio Nacional de Meteorologia en San Juan mientras siguen las
indicaciones de las autoridades locales y estatales.
Event by event
5 flood, 5 flash flood, 2 debris flow. Local standard time, as filed.
Flood, San Juan
- When
- October 13, 2:30 PM AST to 5:00 PM AST
- Where
- San Juan County, 1.7 mi NW of San Juan to 1.78 mi NW of San Juan
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 18.397, -66.069
Flooding reported in Urbanization Villa Nevarez, Calle 10, 3, 5.
Flood, San Juan
- When
- October 13, 2:30 PM AST to 5:00 PM AST
- Where
- San Juan County, 1.53 mi NW of San Juan to 1.4 mi NW of San Juan
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 18.393, -66.069
One lane was intransitable along Road PR-21 in Rio Piedras due to flooding.
Flash Flood, San Juan
- When
- October 13, 3:00 PM AST to 5:00 PM AST
- Where
- San Juan County, 1.82 mi SSE of San Juan to 2.03 mi SSE of San Juan
- Cause
- Heavy Rain
- Property damage
- $500
- Reported by
- 911 Call Center
- Coordinates
- 18.355, -66.041
Residence flooded along Road PR-844 in Cupey.
Flood, San Sebastian
- When
- October 13, 5:15 PM AST to 6:45 PM AST
- Where
- San Sebastian County, 2.85 mi NW of San Sebastian to 2.88 mi NW of San Sebastian
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 18.345, -67.005
Intersection of Road PR-125 and Road PR-446 impassable due to flooding from a small creek.
Flood, Bayamon
- When
- October 15, 3:00 PM AST
- Where
- Bayamon County, 2.98 mi NE of Bayamon to 2.96 mi NE of Bayamon
- Cause
- Heavy Rain
- Reported by
- 911 Call Center
- Coordinates
- 18.384, -66.142
Flooding reported along Avenida Main near Jardineria Esmeralda.
Debris Flow, Bayamon
- When
- October 16, 1:30 PM AST to 4:30 PM AST
- Where
- Bayamon County, 2.96 mi SSW of Bayamon to 2.99 mi SSW of Bayamon
- Cause
- Heavy Rain
- Reported by
- 911 Call Center
- Coordinates
- 18.309, -66.181
Mudslide reported along Road PR-8829 near Iglesia Pentecoastal Sector El Chicharo.
Flood, San Juan
- When
- October 16, 2:20 PM AST to 4:20 PM AST
- Where
- San Juan County, 1.52 mi WNW of San Juan to 1.48 mi NW of San Juan
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 18.391, -66.070
Small stream in the Urbanization of Villa Nevarez went out of its banks, flooding Calle 5.
Flash Flood, San Juan
- When
- October 16, 2:20 PM AST to 4:20 PM AST
- Where
- San Juan County, 3.76 mi NW of San Juan to 3.67 mi NW of San Juan
- Cause
- Heavy Rain
- Property damage
- $1,000
- Reported by
- Emergency Manager
- Coordinates
- 18.418, -66.091
Flooding reported along Avenida de Diego below the bridge of Expresso 22, trapping one person.
Flash Flood, San Juan
- When
- October 16, 2:20 PM AST to 4:20 PM AST
- Where
- San Juan County, 0.24 mi SW of San Juan to 0.28 mi WSW of San Juan
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 18.378, -66.053
Flooding reported along Calle San Genaro in the Urbanization Sagrado Corazon.
Flash Flood, San Juan
- When
- October 16, 2:30 PM AST to 4:20 PM AST
- Where
- San Juan County, 2.73 mi WNW of San Juan to 2.7 mi NW of San Juan
- Cause
- Heavy Rain
- Property damage
- $1,000
- Reported by
- 911 Call Center
- Coordinates
- 18.401, -66.085
Two people trapped inside a vehicle in Calle 5SE intersection with Calle 16SE in the Urbanization of Cappara Terrace due to a small stream going out of its banks.
Flash Flood, San Juan
- When
- October 16, 2:55 PM AST to 4:20 PM AST
- Where
- San Juan County, 2.4 mi NW of San Juan to 2.16 mi NNW of San Juan
- Cause
- Heavy Rain
- Property damage
- $1,000
- Reported by
- 911 Call Center
- Coordinates
- 18.408, -66.071
A vehicle with people inside was trapped in Expresso Las Americas, Exit 5B, in the direction from Caguas to San Juan.
Debris Flow, Comerio
- When
- October 16, 4:55 PM AST
- Where
- Comerio County, 1.8 mi WSW of Comerio to 1.78 mi WSW of Comerio
- Cause
- Heavy Rain
- Reported by
- 911 Call Center
- Coordinates
- 18.209, -66.245
Mudslide reported along Road PR-156 near the intersection with Road PR-776.
- Flood
- Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
- 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.
- Debris Flow
- A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Flash Flooding and Damaging Wind in Texas, October 13 to 14, 20212 deaths · $75,000 · 56 kt wind · 23 events
- Tornadoes in Minnesota, October 13, 2021EF1 · 5 events
- High Wind in South Dakota, October 13, 202168 kt wind · 11 events
- High Wind in Nebraska, October 13, 202164 kt wind · 10 events
- Tornadoes and Damaging Wind in South Dakota, October 13, 2021EF0 · 10 events
- Tornado in North Dakota, October 13, 2021EF0 · 4 events
- Frost and Freeze in Colorado, October 13 to 14, 20213 events
- Damaging Winds in Kansas, October 13, 202152 kt wind · 2 events
- Damaging Wind in Minnesota, October 13, 202178 kt wind · 2 events
- Damaging Wind in Texas, October 13, 202150 kt wind · 1 event
- Lightning Strike in South Dakota, October 13, 2021$10,000 · 1 event
- High Wind in Nebraska, October 13, 202153 kt wind · 1 event
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 2026-09-30. Each event’s entry at NCEI: 986673, 986861, 987108, 987109, 987387, 987388, 987877, 987883, 987884, 987885, 987886, 987888.