Puerto Rico, 2005

Flash Flooding in Puerto Rico, July 31, 2005

July 31, 2005 · NWS SJU · 5 events in 3 counties and zones

5 flash flood, as filed by the National Weather Service.

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
5

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 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 Jul 31, 5:45 AM AST, 8 hours 45 minutes earlier.

Area forecast discussion, Jul 31, 5:45 AM AST, 8 hours 45 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, Jul 31, 6:30 AM AST, 8 hours before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JUAN PR
630 AM AST SUN JUL 31 2005

PRZ001>013-AMZ710>750-011030-
630 AM AST SUN JUL 31 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO.

.DAY ONE...TODAY AND TONIGHT...
A STRONG TROPICAL WAVE CONTINUED TO MOVE WESTWARD ACROSS
HISPANIOLA...THE CENTRAL CARIBBEAN...AND THE ADJACENT ATLANTIC THIS
MORNING...LEAVING A SOUTHEASTERLY WIND FLOW ACROSS THE NORTHEAST
CARIBBEAN REGION. SATELLITE PICTURES SHOW A MORE STABLE ATMOSPHERE
AND A DRY AIR MASS SOUTH OF PUERTO RICO BETWEEN THE TROPICAL WAVE
EXITING THE ISLAND AND THE NEXT TROPICAL WAVE. A MID TO UPPER LEVEL
HIGH PRESSURE WILL DOMINATE THE WEATHER CONDITIONS OVER THE AREA
TODAY. EXPECT MOSTLY SUNNY SKIES DURING THE MORNING HOURS...BUT
LATER IN THE AFTERNOON...WE SHALL SEE AN INCREASE OF CLOUDS AND
MOISTURE...TO PRODUCE SHOWERS AND THUNDERSTORMS OVER THE CENTRAL
INTERIOR...NORTH CENTRAL AND NORTHWEST SECTIONS OF PUERTO RICO WITH
AN EAST SOUTHEASTERLY WIND FLOW.

MARINE CONDITIONS...WINDS FROM 3 TO 15 KNOTS AND SEAS OF 5 FEET OR
LESS WILL PREVAIL ACROSS THE LOCAL COASTAL WATERS TODAY.

.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED.

.DAYS TWO THROUGH SEVEN...
WEATHER CONDITIONS WILL IMPROVE TODAY THROUGH MONDAY...BUT LOCAL
EFFECTS AND DIURNAL HEATING WILL PRODUCE SHOWER AND THUNDERSTORM
ACTIVITY FOR BOTH DAYS ACROSS THE CENTRAL INTERIOR AND NORTHWEST
SECTIONS OF THE ISLAND. NEXT TROPICAL WAVE IS FORECAST TO APPROACH
THE LOCAL AREA ON TUESDAY.

VIZ001-002-AMZ720>730-011030-
630 AM AST SUN JUL 31 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS.

.DAY ONE...TODAY AND TONIGHT...
THE STRONG TROPICAL WAVE THAT BROUGHT ALL THIS ACTIVE WEATHER ACROSS
THE LOCAL ISLANDS FOR THE LAST TWO DAYS WILL CONTINUE TO MOVE ACROSS
HISPANIOLA AND AWAY FROM THE LOCAL AREA ON SUNDAY. SATELLITE
PICTURES SHOW A MORE STABLE ATMOSPHERE AND A DRY AIR MASS SOUTH OF
THE ISLANDS BETWEEN THE TROPICAL WAVE EXITING THE LOCAL ISLANDS AND
THE NEXT TROPICAL WAVE. A MID TO UPPER LEVEL HIGH PRESSURE WILL
DOMINATE THE WEATHER CONDITIONS OVER THE LOCAL AREA TODAY. EXPECT
MOSTLY SUNNY SKIES DURING THE MORNING HOURS...BUT LATER IN THE
AFTERNOON...WE SHALL SEE AN INCREASE OF CLOUDS AND MOISTURE...TO
PRODUCE SHOWERS AND THUNDERSTORMS MAINLY OVER THE COASTAL WATERS.

MARINE CONDITIONS...WINDS FROM 11 TO 17 KNOTS AND SEAS OF 5 FEET OR
LESS WILL PREVAIL ACROSS THE LOCAL COASTAL WATERS TODAY.

.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED.

.DAYS TWO THROUGH SEVEN...
WEATHER CONDITIONS WILL IMPROVE TODAY AT LEAST THROUGH
TOMORROW...BUT LOCAL EFFECTS AND DIURNAL HEATING WILL PRODUCE SHOWER
AND THUNDERSTORM ACTIVITY ACROSS THE ISLANDS AND ADJACENT COASTAL
WATERS. NEXT TROPICAL WAVE IS FORECAST TO APPROACH THE LOCAL ISLANDS
ON TUESDAY.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE WEB
SITE FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS AT (ALL LOWERCASE
LETTERS): HTTP://WWW.SRH.NOAA.GOV/SJU.

In the hours before

Special weather statement, Jul 31, 2:16 PM AST, 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
216 PM AST SUN JUL 31 2005

PRZ001-006-311900-
SAN JUAN AND VICINITY-CENTRAL INTERIOR-
216 PM AST SUN JUL 31 2005

AT 211 PM...DOPPLER WEATHER RADAR SHOWED A STRONG THUNDERSTORM OVER
NORTHERN COMERIO...NARANJITO...TOA ALTA AND SOUTHWEST BAYAMON MOVING
SLOWLY EAST NORTHEAST. THIS STORM WILL CONTINUE TO AFFECT THESE
AREAS THROUGH 225 PM AND WILL REACH THE REST OF BAYAMON AND AGUAS
BUENAS BY 235 PM. THIS THUNDERSTORM WILL CONTAIN TORRENTIAL
DOWNPOURS...FREQUENT AND DANGEROUS CLOUD TO GROUND LIGHTNING...
STRONG WIND GUSTS TO OVER 40 MPH...LOW LYING FLOODING AND POSSIBLY
SOME SMALL HAIL. RESIDENTS SHOULD MONITOR THE WEATHER CLOSELY
THROUGH THE REST OF THIS AFTERNOON AND MOVE INSIDE A STURDY
STRUCTURE AT THE FIRST SIGN OF THREATENING WEATHER.

SEELEY

The radar

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

Open the radar archive at this moment

Event by event

5 flash flood. Local standard time, as filed.

Flash Flood, Central Interior

When
July 31, 2:30 PM AST to 6:30 PM AST
Where
Central Interior County, Naranjito
Reported by
EMERGENCY MANAGER
Coordinates
18.483, -66.417

A flooded home was reported in Barrio Nuevo.

Flash Flood, Central Interior

When
July 31, 2:43 PM AST to 6:43 PM AST
Where
Central Interior County, Naranjito
Reported by
EMERGENCY MANAGER
Coordinates
18.483, -66.417

Flooded home patios were reported at La Marina Urb.

Flash Flood, Central Interior

When
July 31, 3:00 PM AST to 7:00 PM AST
Where
Central Interior County, Morovis
Reported by
EMERGENCY MANAGER
Coordinates
18.317, -66.417

A river was reported out of its banks and overtopping the bridge a La Playita sector in Morovis.

Flash Flood, North Central

When
July 31, 3:26 PM AST to 7:26 PM AST
Where
North Central County, Vega Alta
Reported by
EMERGENCY MANAGER
Coordinates
18.417, -66.333

People were reported trapped in a car due to flood waters at Lagos de Plata Urb.

Flash Flood, Eastern Interior

When
July 31, 3:32 PM AST to 7:32 PM AST
Where
Eastern Interior County, Comerio
Reported by
EMERGENCY MANAGER
Coordinates
18.217, -66.217

People were swept by a strong water current at Barrio Paloma.

What these are

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.

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

The same day elsewhere

More

Every storm in Puerto Rico in 2005Every state in 2005This day in weather historyWarnings in Puerto Rico, July 2005

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 2026-10-01. Each event’s entry at NCEI: 5464665, 5464666, 5464667, 5464668, 5464669.