Puerto Rico, 2004Flash Flood in Puerto Rico, July 18, 2004
July 18, 2004 · NWS SJU · 1 event in 1 county or zone
1 flash flood, as filed by the National Weather Service.
- Deaths
- 0
- Injuries
- 0
- Property damage
- $200,000
- Crop damage
- None recorded
- Events
- 1
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 18, 2:30 PM AST, 1 hour 15 minutes earlier.
Area forecast discussion, Jul 18, 2:30 PM AST, 1 hour 15 minutes before
PUERTO RICO AND U.S. VIRGIN ISLANDS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
230 PM AST SUN JUL 18 2004
.DISCUSSION...AFTERNOON CONVECTION FIRED ALONG THE WEST AND
NORTHWEST AND ALSO OVER SECTIONS OF THE SAN JUAN GREATER AREA AS THE
SOUTHEAST FLOW ALLOWED THE STREAMER FROM THE RAIN FOREST TO INTERACT
WITH SEA BREEZE OVER PUERTO RICO. ONCE THE ISOLATED SHOWERS AND
THUNDERSTORMS DRIFT OFFSHORE DURING THE LATE AFTERNOON AND EARLY
EVENING ...A GENERALLY STABLE PATTERN EXPECTED ACROSS THE LOCAL AREA
TONIGHT THROUGH MONDAY MORNING. A FEW SHOWERS TONIGHT AND EARLY
MONDAY MORNING ACROSS THE USUAL COASTAL SECTORS OF THE USVI AND
PUERTO RICO UNDER EAST TO SOUTHEAST WINDS AT 10 KNOTS OR LESS.
MONDAY AFTERNOON WOULD EXPECT SOME LOCAL EFFECTS ESPECIALLY OVER THE
WEST AND NORTHWEST PUERTO RICO...AS LOW LEVEL MOISTURE INTRUDES INTO
THE AREA AHEAD OF THE NEXT TROPICAL WAVE LOCATED JUST EAST OF THE
NORTHERN WINDWARD ISLANDS THIS AFTERNOON. WAVE SHOULD IMPACT USVI
DURING THE MID TO LATE AFTERNOON OF MONDAY TO EARLY EVENING AND
MODELS HINT AT WAVE AXIS MOVING INTO THE MONA PASSAGE AFTER MIDNIGHT
MONDAY. THIS WILL ALLOW TRAILING MOISTURE TO AFFECT AREA THROUGH
TUESDAY WITH SHOWERS AND FEW THUNDERSTORMS. TUTT TROUGH IS FORECAST
TO UNDERGO RETROGRESSION THROUGH TUESDAY AND TO BECOME POSITIONED
ACROSS EAST HISPANIOLA WHICH WOULD FAVOR CONVECTION OVER PUERTO RICO
ON TUESDAY.
A SECOND TROPICAL WAVE...BETTER DEFINED IN THE MODELS IN TERMS OF
WIND FIELD AND WEATHER...WILL MOVE ACROSS THE LESSER ANTILLES
TUESDAY AND TUESDAY NIGHT AND THEN ACROSS THE U.S. VIRGIN ISLANDS
AND PUERTO RICO WEDNESDAY THROUGH WEDNESDAY NIGHT WITH MOISTURE
LINGERING THROUGH THURSDAY. THIS WAVE IS LIKELY TO BE A RAIN
PRODUCER FOR THE LOCAL AREA...WITH STRONG AND GUSTY WINDS TUESDAY
NIGHT THROUGH WEDNESDAY.
FOR FRIDAY THROUGH FRIDAY NIGHT ALTHOUGH DRIER AIR TAKES HOLD OF
LOCAL WEATHER...SHORT WAVE TROUGH TO THE NORTH COULD DESTABILIZE
AIRMASS ACROSS WEST PUERTO RICO WITH SOMEWHAT WEAKER WAVE CROSSING
ON SUNDAY.
&&
.MARINE...EXPECT WIND OF 21 KNOTS OR LESS AND SEAS 5 FEET OR LESS
THROUGH TUESDAY.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 77 88 78 90 / 40 20 40 20
STT 75 90 77 89 / 40 30 40 30
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...NONE.
VI...NONE.
&&
RM
Hazardous weather outlook, Jul 18, 6:00 AM AST, 9 hours 45 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JUAN PR
600 AM AST SUN JUL 18 2004
PRZ001>013-AMZ710>750-191000-
600 AM AST SUN JUL 18 2004
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO.
.TODAY AND TONIGHT...
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL FORM MAINLY ACROSS
THE INTERIOR AND WEST TO NORTHWEST PORTIONS OF PUERTO RICO DURING
THE AFTERNOON. THE HEAVIEST SHOWERS COULD CAUSE SOME PONDING OF
WATER ON ROADS. NO HAZARDOUS WEATHER IS EXPECTED.
WINDS AND SEAS WILL BEGIN TO SUBSIDE TODAY.
.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED.
.DAYS TWO THROUGH SEVEN...
A TROPICAL WAVE WILL MOVE ACROSS THE U.S. VIRGIN ISLANDS AND
PUERTO RICO MONDAY NIGHT INTO EARLY TUESDAY...WITH THE NEXT MORE
SIGNIFICANT WAVE EXPECTED TO ARRIVE ON WEDNESDAY. AN INCREASE IN
RAIN CHANCES AND WINDS CAN BE EXPECTED WITH THE PASSAGE OF EACH
TROPICAL WAVE...ESPECIALLY THE SECOND ONE. OCCASIONAL PERIODS OF
HEAVY RAINFALL CAUSING SOME LOCALIZED FLOODING COULD BE POSSIBLE ON
WEDNESDAY.
VIZ001-002-AMZ710>730-191000-
600 AM AST SUN JUL 18 2004
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS.
.TODAY AND TONIGHT...
SCATTERED SHOWERS ARE EXPECTED TODAY. NO HAZARDOUS WEATHER IS
EXPECTED.
WINDS AND SEAS WILL BEGIN TO SUBSIDE TODAY.
.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED.
.DAYS TWO THROUGH SEVEN...
A TROPICAL WAVE WILL MOVE ACROSS THE U.S. VIRGIN ISLANDS AND
PUERTO RICO MONDAY NIGHT INTO EARLY TUESDAY...WITH THE NEXT MORE
SIGNIFICANT WAVE EXPECTED TO ARRIVE ON WEDNESDAY. AN INCREASE IN
RAIN CHANCES AND WINDS CAN BE EXPECTED WITH THE PASSAGE OF EACH
TROPICAL WAVE...ESPECIALLY THE SECOND ONE. OCCASIONAL PERIODS OF
HEAVY RAINFALL CAUSING SOME LOCALIZED FLOODING COULD BE POSSIBLE ON
WEDNESDAY.
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.
Flash Flood, San Juan and Vicinity
- When
- July 18, 3:45 PM AST to 7:45 PM AST
- Where
- San Juan and Vicinity County, Toa Baja
- Property damage
- $200,000
- Reported by
- EMERGENCY MANAGER
An area of nearly stationary showers and thunderstorms affected the western part of the San juan metro area mainly between northern Bayamon, southwest Catano, and Toa Baja. Flooding was reported in Villa Marisol, and El Sector 26 of Sabana Seca. More than 40 houses were reported flooded. Significant flooding of roads around Sabana Seca was reported. Road 5 from Catano to Bayamon was reported flooded.
- 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.
- Tornadoes and Hail in North Dakota, July 18, 2004$2.6 million · F4 · 23 events
- Lightning Strike in Florida, July 18, 20041 death · 2 injured · 1 event
- Rip Current in North Carolina, July 18, 20041 death · 1 event
- Flash Flood in Idaho, July 18, 2004$535,000 · 1 event
- Debris Flow in Wyoming, July 18, 2004$275,000 · 1 event
- Flash Flooding in Pennsylvania, July 18, 2004$125,000 · 2 events
- Flash Flood in Louisiana, July 18, 2004$50,000 · 1 event
- Heavy Rain in Colorado, July 18, 2004$40,000 · 1 event
- Flash Flood in New York, July 18, 2004$20,000 · 1 event
- Flash Flood in New York, July 18, 2004$20,000 · 1 event
- Flash Flood in Pennsylvania, July 18, 2004$18,000 · 1 event
- Hail and Damaging Wind in New Mexico, July 18, 2004$15,000 · 52 kt wind · 2 events
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: 5413769.