Puerto Rico, 2019

Debris Flow and Flooding in Puerto Rico, September 6 to 8, 2019

September 6 to 8, 2019 · NWS SJU · 7 events in 4 counties and zones

The combination of a deep-layered trough, abundant moisture in combination with strong daytime heating and local effects resulted in rounds of heavy showers and thunderstorms across different portions of Puerto Rico during the afternoon hours between September 6th and September 8th.

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
7

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.

The combination of a deep-layered trough, abundant moisture in combination with strong daytime heating and local effects resulted in rounds of heavy showers and thunderstorms across different portions of Puerto Rico during the afternoon hours between September 6th and September 8th.

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 6, 11:42 AM AST, 1 hour 19 minutes earlier.

Area forecast discussion, Sep 6, 11:42 AM AST, 1 hour 19 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Sep 6, 7:21 AM AST, 5 hours 40 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

6 flood, 1 debris flow. Local standard time, as filed.

Flood, Lares

When
September 6, 1:01 PM AST to 4:15 PM AST
Where
Lares County, 2.12 mi NNW of Lares to 2.07 mi NNW of Lares
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.300, -66.878

Flooding reported along Residencial Francisco Sein across from the Fire Station.

Flood, Carolina

When
September 6, 3:49 PM AST to 5:30 PM AST
Where
Carolina County, 4.19 mi NW of Carolina to 4.18 mi NW of Carolina
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.415, -65.993

Flooding reported along Avenida El Comandante passing el Selecto Supermarket.

Flood, Bayamon

When
September 6, 4:16 PM AST to 5:30 PM AST
Where
Bayamon County, 3.5 mi NNE of Bayamon to 3.48 mi NNE of Bayamon
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.394, -66.143

Flooding reported along Avenida Main near Laboratorio Clinico Caribbean across from the Walgreens.

Flood, Bayamon

When
September 6, 4:27 PM AST to 5:30 PM AST
Where
Bayamon County, 4.82 mi N of Bayamon to 4.79 mi N of Bayamon
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.420, -66.167

Flooding reported along Calle Rio Bayamon.

Flood, Toa Baja

When
September 6, 4:27 PM AST to 5:30 PM AST
Where
Toa Baja County, 1.45 mi ENE of Toa Baja to 1.55 mi E of Toa Baja
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.435, -66.178

Flooding reported along Calle Aurelio Due o in the 7th section of Levittown.

Flood, Bayamon

When
September 6, 4:35 PM AST to 5:30 PM AST
Where
Bayamon County, 4.16 mi NNE of Bayamon to 4.14 mi NNE of Bayamon
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
18.403, -66.140

Flooding reported along Calle Zaragoza in the Urbanization of Villa Espa a.

Debris Flow, Bayamon

When
September 8, 4:20 PM AST
Where
Bayamon County, 1.8 mi SW of Bayamon to 1.76 mi SW of Bayamon
Cause
Heavy Rain
Reported by
Social Media
Coordinates
18.330, -66.187

Mudslide at Barrio Buena Vista PR-829 KM 5.1 in Bayamon.

What these are

Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
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.

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: 856268, 856269, 856270, 856271, 856272, 856274, 856282.