Flash Flood, Northeast
- When
- May 7, 9:50 PM AST to 11:50 PM AST
- Where
- Northeast County, Loiza
- Reported by
- EMERGENCY MANAGER
River Rio Grande de Loiza was reported out of its banks.
Flash Flood in Puerto Rico, May 7, 2004
1 flash flood, as filed by the National Weather Service.
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- 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 May 7, 2:46 PM AST, 7 hours 4 minutes earlier.
Area forecast discussion, May 7, 2:46 PM AST, 7 hours 4 minutes before
PUERTO RICO AND U.S. VIRGIN ISLANDS FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 245 PM AST FRI MAY 7 2004 .DISCUSSION...NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS HAVE DEVELOPED OVER THE NORTHWEST AND WESTERN INTERIOR SECTIONS OF PUERTO RICO. THESE SHOWERS ARE SPREADING TO THE EAST AND NEW SHOWERS ARE REDEVELOPING ACROSS THE INTERIOR SECTIONS OF THE EASTERN HALF OF PUERTO RICO. SHOWERS ARE PRODUCING RAINFALL ACCUMULATIONS OF AROUND 1 AND 2 INCHES. THE AFTERNOON SHOWERS ACTIVITY IS BEING ENHANCE BY THE WEAK BOUNDARY LOCATED JUST NORTHWEST OF PUERTO RICO. THESE BOUNDARY IS EXPECTED TO CONTINUE TO MOVE SLOWLY SOUTHWEST AND ACROSS PUERTO RICO TONIGHT. THIS FEATURE WILL ENHANCE THE SHOWERS AND THUNDERSTORMS MAINLY OVER THE SURROUNDING WATERS. FOR THE NEXT FEW DAYS AFTERNOON SHOWERS WILL BE MORE ISOLATED AS A HIGH PRESSURE WILL MOVE OVER OUR REGION...BRINGING A MORE STABLE AND DRYER AIRMASS. && .MARINE...AS WINDS HAVE RELAXED ALSO THE SEAS HAVE DECREASED. WE SHOULD TRANQUIL SEAS CONDITIONS THROUGH SATURDAY AFTERNOON...WHEN A NORTHWESTERLY SWELL IS EXPECTED TO REACH NORTHERN COAST OF PUERTO RICO AND ALL PASSAGES. && .PRELIMINARY POINT TEMPS/POPS... SJU 74 84 73 84 / 50 40 50 40 STT 74 84 73 84 / 40 40 40 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 10
Hazardous weather outlook, May 7, 6:00 AM AST, 15 hours 50 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 600 AM AST FRI MAY 7 2004 PRZ001>013-AMZ710>750-081000- 600 AM AST FRI MAY 7 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO. .TODAY...INCREASING MOISTURE AND INSTABILITY DUE TO THE PROXIMITY OF A FRONTAL BOUNDARY...WILL RESULT IN A BETTER CHANCE FOR SHOWER ACTIVITY AND ISOLATED THUNDERSTORMS OVER PARTS OF PUERTO RICO TODAY. A FEW LOCATIONS COULD RECEIVE ENOUGH RAINFALL TO RESULT IN SOME URBAN AND SMALL STREAM FLOODING. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED. .DAYS TWO THROUGH SEVEN... THE WEATHER CONDITIONS WILL CONTINUE HUMID AND UNSTABLE DURING THE NEXT SEVERAL DAYS...WITH ADDITIONAL SHOWERS AND THUNDERSTORMS. ASSOCIATED RAINFALL COULD RESULT IN AT LEAST SOME URBAN AND SMALL STREAM FLOODING. A MODERATE TO FRESH WIND FLOW AND CHOPPY SEAS WILL PREVAIL ACROSS THE LOCAL WATERS SATURDAY NIGHT THROUGH TUESDAY. VIZ001-002-AMZ710>730-081000- 600 AM AST FRI MAY 7 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS. .TODAY...SCATTERED SHOWERS WILL OCCUR ACROSS MOST OF THE ISLANDS TODAY. NO HAZARDOUS WEATHER CONDITIONS ARE EXPECTED. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED. .DAYS TWO THROUGH SEVEN... THE WEATHER CONDITIONS WILL CONTINUE HUMID AND UNSTABLE DURING THE NEXT SEVERAL DAYS...WITH ADDITIONAL SHOWERS AND THUNDERSTORMS. ASSOCIATED RAINFALL COULD RESULT IN AT LEAST SOME URBAN AND GUT FLOODING. A MODERATE TO FRESH WIND FLOW AND CHOPPY SEAS WILL PREVAIL ACROSS THE LOCAL WATERS SATURDAY NIGHT THROUGH 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
Local storm report, May 7, 7:54 PM AST, 1 hour 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
754 PM AST FRI MAY 07 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0630 PM FLASH FLOOD CAROLINA 18.41N 65.98W
05/07/2004 CAROLINA PR EMERGENCY MNGR
PARKED TRUCK ALONG RIO GRANDE DE LOIZA SWEPT INTO RIVER
WITH FLOODING SURGE IN STREAMFLOW
&&
70Event by event
1 flash flood. Local standard time, as filed.
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
- Tornado and Damaging Winds in Virginia, May 7, 2004
- Hail and Damaging Winds in Iowa, May 7, 2004
- Flash Flood and Hail in Ohio, May 7, 2004
- Hail and Damaging Winds in Illinois, May 7, 2004
- Hail in Iowa, May 7 to 8, 2004
- Hail in Michigan, May 7, 2004
- Damaging Winds and Lightning Strike in Virginia, May 7, 2004
- Flood and Hail in Indiana, May 7, 2004
- Lightning Strike in Pennsylvania, May 7, 2004
- Heavy Rain in Puerto Rico, May 7, 2004
- Hail in Ohio, May 7, 2004
- Hail and Damaging Winds in West Virginia, May 7, 2004
More
Every storm in Puerto Rico in 2004Every state in 2004This day in weather historyWarnings in Puerto Rico, May 2004
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: 5398613.