1 flash 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 Apr 26, 12:00 PM AST, 1 hour 32 minutes earlier.
PUERTO RICO AND U.S. VIRGIN ISLANDS FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1200 PM AST MON APR 26 2004 LLVL VORT CENTER NOW MOVING INTO EASTERN DOM REP WITH BEST CONVERGENCE AND WEATHER JUST ENTERING P.R. ATTM AND SHOULD DIMINISH IN THE VIRGIN ISLANDS WITHIN 90 MINUTES. HAVE THEREFORE MADE TIMING ADJUSTMENTS TO PREVIOUS PACKAGE...BUT OTHERWISE LEFT INTACT. .330 AM DISCUSSION...PREVIOUS DISCUSSION STILL HOLDING NICELY AS LOW LEVEL VORTICITY CENTER...VISIBLE IN MODELS AND SATELLITE PICTURES...MOVES JUST NORTH OF PUERTO RICO AND THE VIRGIN ISLANDS. RADAR SHOWS MOST SHOWER ACTIVITY NORTH OF THE WESTERN HALF OF PUERTO RICO OVER THE ATLANTIC WITH SOME SCATTERED SHOWERS FROM VIEQUES SOUTH. GFS SHOWS 850 MOISTURE MOVING WEST NORTHWEST AT 13 KNOTS...WHICH WILL MOVE THE SLIGHTLY NEGATIVELY TILTED RELATIVE HUMIDITY AXIS OVER PUERTO RICO AT 00Z TUESDAY. FLOW AT 850 MB GAINS A SOUTHERLY COMPONENT TODAY AND THIS SHOULD HAVE A SIGNIFICANT EFFECT ON SURFACE FLOW AND MAXIMUM TEMPERATURES ...MAINLY ALONG THE NORTH COAST TODAY AND TOMORROW. HAVE RAISED TEMPERATURES A FEW DEGREES...AS SEA BREEZES OF THE PAST FEW DAYS HAVE KEPT MAXIMUM TEMPERATURES DOWN AND THEIR ABSENCE SHOULD BE NOTICEABLE. SOME SEA BREEZE MAY DEVELOP NEAREST THE SHORE ALONG THE NORTH COAST DESPITE OUR CHANGES IN FLOW. WOULD RAISE TEMPERATURES MORE...BUT INCREASED MOISTURE AND CLOUDINESS WILL HOLD MAXIMUM TEMPERATURES IN CHECK. THE MOISTURE SHOULD REACH A MAXIMUM ON TUESDAY NEAR MIDDAY. MOISTURE ALSO BECOMES DEEPEST THEN AS WELL. THIS SHOULD FAVOR MIDDAY DEVELOPMENT IN NORTHWEST PUERTO RICO...AND SOME RAINFALL WILL LIKELY BE VERY HEAVY IN THE INTERIOR THERE. DRIER AIR MOVES OVER THE AREA ON WEDNESDAY AND SHOWERS WILL DECREASE. SURFACE HIGH PRESSURE IS CURRENTLY NORTH NORTHWEST OF THE AREA AND IS MOVING EAST. WHEN IT PASSES NORTH OF PUERTO RICO IT WILL ALSO STRENGTHEN SOMEWHAT AND FLOW WILL THEN BECOME MORE SOUTHEASTERLY... ESPECIALLY AT 850 MB. THIS WILL CAUSE THE FOCUS OF AFTERNOON STORMS TO MOVE FROM SOUTHWEST PUERTO RICO TO NORTHWEST PUERTO RICO. THE TREND WILL REVERSE AGAIN LATER IN THE WEEK. RIDGING IS THE DOMINANT FEATURE AT 500 MB AND PRESSURE GRADIENTS ARE RATHER LIGHT AT MID LEVELS. WHILE HIGH PRESSURE AT THE SURFACE TENDS TO REMAIN IN THE WEST CENTRAL NORTH ATLANTIC THE SUB TROPICAL JET AT 250 MB DIPS BELOW THE LATITUDE OF PUERTO RICO ON MONDAY MAY THIRD. THIS AND THE MORE SOUTHEASTERLY FLOW AT LOWER LEVELS LADEN WITH EQUATORIAL MOISTURE WILL KEEP SOME SHOWERS IN THE FORECAST THROUGH THE BEGINNING OF NEXT WEEK. && .MARINE...WIND WAVES ARE DOMINATING THE SEA CONDITIONS DURING THE NEXT SEVEN DAYS. WINDS WILL INCREASE SOMEWHAT TODAY AND AGAIN ON FRIDAY CREATING SOME SEAS NEAR 6 FEET. THIS WILL RESULT IN CHOPPY MARINE CONDITIONS. SNELL && .PRELIMINARY POINT TEMPS/POPS... SJU 86 74 86 74 / 60 50 50 50 STT 83 74 84 74 / 60 50 50 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 600 AM AST MON APR 26 2004 PRZ001>013-AMZ710>750-271000- 600 AM AST MON APR 26 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO. .TODAY AND TONIGHT...A WEAK LOW LEVEL TROUGH IN THE EASTERLY WIND FLOW WITH CONTINUE ACROSS THE LOCAL REGION TODAY THROUGH TONIGHT. THIS WILL ASSIST IN THE DEVELOPMENT OF LIGHT TO MODERATE EARLY MORNING SHOWERS. SCATTERED AREAS OF HEAVIER SHOWERS WILL FOLLOW DURING THE AFTERNOON MAINLY ACROSS THE INTERIOR AND WEST SECTIONS OF PUERTO RICO. THIS WILL RESULT IN LOCALIZED MODERATE TO HEAVY RAIN. THEREFORE...URBAN FLOODING MAY OCCUR OVER ISOLATED LOCALITIES OF THE INTERIOR AND WEST PUERTO RICO. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED. .TUESDAY THROUGH SUNDAY...LOW LEVEL TROUGH WILL CONTINUE TO MOVE ACROSS THE LOCAL THROUGH TUESDAY. ON WEDNESDAY...HIGH PRESSURE RIDGE WILL THEN BUILD ACROSS THE REGION AND BRING AN INCREASE IN THE LOCAL WIND FLOW. THIS WILL BRING ABOUT AN INCREASE IN MAINLY THE OFF SHORE SEA CONDITIONS. AS A RESULT...VERY CHOPPY MARINE CONDITIONS CAN BE EXPECTED THE REST OF THE WEEK. NO SIGNIFICANT WEATHER HAZARDS EXPECTED THEREAFTER. VIZ001-002-AMZ710>730-271000- 600 AM AST MON APR 26 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS. .TODAY AND TONIGHT...A WEAK LOW LEVEL TROUGH IN THE EASTERLY WIND FLOW WITH CONTINUE TO MOVE WEST ACROSS THE LOCAL ISLANDS TODAY THROUGH TONIGHT. SCATTERED LIGHT TO MODERATE PASSING SHOWERS ARE EXPECTED...HOWEVER FLASH FLOOD CONDITIONS ARE NOT ANTICIPATED. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. .TUESDAY THROUGH SUNDAY..LOW LEVEL TROUGH WILL EXIT THESE ISLANDS ON TUESDAY. ON WEDNESDAY...HIGH PRESSURE RIDGE WILL THEN BUILD ACROSS THE REGION AND BRING AN INCREASE IN THE LOCAL WIND FLOW. THIS WILL BRING ABOUT AN INCREASE IN MAINLY THE OFF SHORE SEA CONDITIONS. AS A RESULT...VERY CHOPPY MARINE CONDITIONS CAN BE EXPECTED THE REST OF THE WEEK. NO SIGNIFICANT WEATHER HAZARDS EXPECTED THEREAFTER. 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.
1 flash flood. Local standard time, as filed.
Two houses were reported flooded at Barrio Ingenio. The Maria T. Pineiro School and a two houses were reported flooded at Barrio Sabana Seca.
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, April 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: 5391794.