1 flood, as filed by the National Weather Service.
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.
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 8, 8:47 PM AST, 4 hours 3 minutes earlier.
PUERTO RICO AND U.S. VIRGIN ISLANDS FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 847 PM AST SAT MAY 8 2004 .UPDATE... NUMEROUS SHOWERS AND SCATTERED STRONG THUNDERSTORMS OCCURRED ACROSS THE CENTRAL AND WESTERN INTERIOR SECTIONS OF PUERTO RICO THIS AFTERNOON. THIS RAINFALL ACTIVITY DIMINISHED IN INTENSITY BY EARLY EVENING. HOWEVER...WATER LEVELS OF SOME RIVERS WERE ABOVE FLOOD STAGE. THESE RIVERS WERE...RIO TANAMA IN ARECIBO...RIO LIMON IN UTUADO...RIO YUNES IN UTUADO...RIO GUAJATACA IN LARES...AND OTHER TRIBUTARIES. THIS AFTERNOON RAINFALL ACTIVITY WAS ASSOCIATED WITH THE RELATIVELY UNSTABLE ATMOSPHERE LEFT BY THE REMNANTS OF A FRONTAL BOUNDARY ACROSS THE ADJACENT ATLANTIC...HIGH LOW LEVEL MOISTURE...DIURNAL HEATING...OROGRAPHIC AND SEA BREEZE EFFECTS. UPDATED WEATHER GRIDS FOR WEATHER TO REDUCE RAINFALL ACTIVITY ACROSS THE WESTERN HALF OF PUERTO RICO...AND FORECAST SIMILAR HEAVY RAIN AND FLOODING CONDITIONS FOR TOMORROW SUNDAY AFTERNOON. /ROCHE .245 PM DISCUSSION...SCATTERED TO NUMEROUS SHOWERS HAVE DEVELOP OVER THE INTERIOR SECTIONS OF PUERTO RICO AND DUE TO LIGHT WINDS...THESE SHOWERS ARE SLOWLY SPREADING TO THE NORTHERN AND SOUTHERN COASTAL SECTIONS OF PUERTO RICO. THE USGS RAIN GAUGES ARE ONLY SHOWING RAINFALL ACCUMULATION OF LESS THAN INCH. THESE ARE EXPECTED TO LINGER THROUGH SUNSET. WINDS HAD BEEN MAINLY DRIVEN BY SEA BREEZE ENHANCING THE DEVELOPMENT OF SHOWERS OVER THE INTERIOR SECTIONS. ALL MODELS ARE SUGGESTING A GRADUAL DECREASE ON MOISTURE THROUGH AT LEAST MONDAY NIGHT. THEREFORE WE SHOULD EXPECT MORE ISOLATED SHOWER AS WE GET CLOSER TO MONDAY NIGHT. THESE IS ASSOCIATED TO THE BUILDING OF A HIGH PRESSURE OVER OUR LOCAL REGION. THESE WILL ALSO PRODUCE AN INCREASE ON WINDS TONIGHT AND ON SUNDAY. LOOKING AHEAD...GFS HAD BEEN PORTRAYING A RATHER UNSETTLED SPELL OF WEATHER FOR EARLY NEXT WEEK...BUT HAS BACKED OFF A BIT ON THIS IDEA...WITH THE DEEPEST MOISTURE REMAINING MAINLY NORTH AND SOUTH OF THE FA THROUGH WEDNESDAY. STAY TUNED. && .MARINE...A MODERATE TO FRESH WILL OCCUR TONIGHT THROUGH WEDNESDAY. SEAS MOSTLY 6 FEET OR LESS THROUGH THE PERIOD. NORTH NORTHWEST SWELLS WILL BEGIN TO AFFECT THE ATLANTIC WATERS AND ALL CARIBBEAN PASSAGES THIS EVENING AND THEN BECOME NORTH AND EVENTUALLY NORTH NORTHEAST AND LINGER THROUGH AT LEAST SUNDAY NIGHT OR MONDAY. && .PRELIMINARY POINT TEMPS/POPS... SJU 84 73 84 73 / 40 50 40 50 STT 84 73 84 73 / 40 40 40 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 10
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 611 AM AST SAT MAY 8 2004 PRZ001>013-AMZ710>750-091000- 611 AM AST SAT MAY 8 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO. .TODAY...MOISTURE ASSOCIATED WITH THE REMNANTS OF A COLD FRONTAL BOUNDARY...WILL COMBINE WITH THE LOCAL EFFECTS TO PRODUCE SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS...MAINLY ACROSS THE INTERIOR AND WEST PART OF PUERTO RICO DURING THE AFTERNOON HOURS. A FEW LOCATIONS WILL AGAIN RECEIVE ENOUGH RAINFALL TO RESULT IN SOME URBAN AND SMALL STREAM FLOODING...WITH THE POTENTIAL FOR LOCALIZED FLASH OR RIVER FLOODING. MARINE CONDITIONS WILL DETERIORATE SLIGHTLY THIS AFTERNOON...AS NORTH NORTHWEST SWELLS BEGIN TO AFFECT THE ATLANTIC COASTAL WATERS AND ALL CARIBBEAN PASSAGES. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED. .DAYS TWO THROUGH SEVEN... EXPECT SCATTERED SHOWERS AND ISOLATED 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 UNTIL TUESDAY. VIZ001-002-AMZ710>730-091000- 611 AM AST SAT MAY 8 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. MARINE CONDITIONS WILL DETERIORATE SLIGHTLY THIS AFTERNOON...AS NORTH NORTHWEST SWELLS BEGIN TO AFFECT THE ATLANTIC COASTAL WATERS AND ALL CARIBBEAN PASSAGES. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED. .DAYS TWO THROUGH SEVEN... SCATTERED SHOWERS WILL OCCUR ACROSS THE U.S. VIRGIN ISLANDS DURING THE NEXT SEVERAL DAYS. NO HAZARDOUS WEATHER CONDITIONS ARE EXPECTED. A MODERATE TO FRESH WIND FLOW AND CHOPPY SEAS WILL PREVAIL ACROSS THE LOCAL WATERS UNTIL 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.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1232 AM AST SUN MAY 09 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
1226 AM HEAVY RAIN JAYUYA 18.22N 66.60W
05/08/2004 0.00 INCH JAYUYA PR EMERGENCY MNGR
HEAVAY RAIN WAS REPORTED IN THE MUNICIPALITIES OF JAYUYA
AND UTUADO SINCE 2 PM.
&&
A huge mudslide was reported in Jayuya along road 141.
RMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1234 AM AST SUN MAY 09 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
1226 AM HEAVY RAIN UTUADO 18.27N 66.71W
05/08/2004 0.00 INCH UTUADO PR EMERGENCY MNGR
WATER LEVEL FOUR FEET OVER SPILLWAY AT DOS BOCAS LAKE.
&&
RMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1236 AM AST SUN MAY 09 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0900 PM FLASH FLOOD ARECIBO 18.46N 66.74W
05/08/2004 ARECIBO PR EMERGENCY MNGR
RIVER TANAMA WAS REPORTED OVERTOPPING LOW BRIDGES IN
ARECIBO.
&&
RMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1238 AM AST SUN MAY 09 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0940 PM FLASH FLOOD MANATI 18.43N 66.48W
05/08/2004 MANATI PR AIRPLANE PILOT
RIVER RIO GRANDE OF MANATI WAS REPORTED OUT OF ITS BANKS
AT THE CACHETE SECTOR AND FLOODING A LARGE BUT
UNPOPULATED AREA.
&&
RMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
1238 AM AST SUN MAY 09 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0940 PM FLASH FLOOD MANATI 18.43N 66.48W
05/08/2004 MANATI PR EMERGENCY MNGR
RIVER RIO GRANDE OF MANATI WAS REPORTED OUT OF ITS BANKS
AT THE CACHETE SECTOR AND FLOODING A LARGE BUT
UNPOPULATED AREA.
&&
RM1 flood. Local standard time, as filed.
Some municipal roads and streets in La Puntilla sector of Arecibo were reported flooded due to northerly swells blocking the river discharge into the sea at the mouth of the river
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2004Every state in 2004This day in weather historyWarnings in Puerto Rico, May 2004
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: 5398705.