1 heavy rain, 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 20, 5:30 AM AST, 1 hour 35 minutes earlier.
FXCA62 TJSJ DDHHMM AFDSJU PUERTO RICO AND U.S. VIRGIN ISLANDS FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 530 AM AST TUE APR 20 2004 .DISCUSSION... MID TO UPPER TROUGH FROM SW ATLC DIGGING SOUTHWARD INTO THE WESTERN CARIB THIS MORNING WILL CONTINUE TO PRODUCE BROAD LIFT ACROSS THE REGION TODAY AND ALSO CONTINUE TO DRAW TROPICAL MOISTURE FROM THE AMAZON ACROSS THE LOCAL REGION. THIS WILL LIKELY LIMIT SUNSHINE AGAIN TODAY AND MAINTAIN MOSTLY CLOUDY TO CLOUDY SKIES. LOW LEVEL MOISTURE IS SUGGESTED BY RECENT GUIDANCE TO BE LIMITED TO THE AREA OF CONVECTION MOVING ACROSS EASTERN P.R. AND THE LOCAL CARIB WATERS WITH UPSTREAM LLVL MOISTURE EXPECTED TO BE DECREASING NEXT 48 HOURS. CIRRUS AND AS CANOPIES WILL SPREAD PATCHY STRATOFORM PRECIP ACROSS THE REGION AND HAVE ATTEMPTED TO INCLUDE THIS IN GRAPHICAL FORECASTS FOR AREAS NOT DOMINATED BY NUMEROUS CONVECTION. IMPROVING SKIES AND WEATHER WILL BE SEEN THURSDAY THROUGH THE UPCOMING WEEKEND. && .MARINE... RECENT QUIKSCAT PASSES AND NESDIS STLT DERIVED WINDS CONTINUE TO DEPICT A BROAD TROUGH FROM THE CARIB COAST OF SOUTH AMERICA NNE ACROSS THE LOCAL REGION AND INTO THE W CENTRAL ATLC...WITH LLVL PERTURBATIONS MOVING WWD ACROSS THE LOCAL AREA. ESE FLOW WILL PREVAIL ACROSS THE AREA TODAY TO THE EAST OF LLVL TROUGH AND IS FORECAST TO DIMINISH THIS EVENING...WHICH IS A DEPARTURE FROM RECENT GUIDANCE. SOME SIGNIFICANT CHANGES IN PAST FEW MODEL RUNS LEAD ME WITH LOW TO MODERATE CONFIDENCE IN WIND FORECAST NEXT 36 HOURS. SEAS TO SLOWLY SUBSIDE THROUGH WED MORNING THEN MORE QUICKLY THROUGH THE END OF THE WEEK. && .AVIATION... THICK LAYERED MID AND UPPER CLOUDS WILL CONTINUE TO PROVIDE CONDITIONS FOR RHYME ICING ACROSS THE REGION THROUGH TONIGHT. ALSO...YESTERDAYS VISIBLE IMAGERY SHOWED SEVERAL ZONES OF TRANSVERSE BANDING ACROSS THE TOP OF THIS STRATIFIED UPPER CLOUD DECK SUGGESTING VERTICALLY INDUCED SPEED SHEAR AND TURBULENCE WHICH SHOULD PREVAIL AGAIN TODAY...LIKELY 28-35K FT. && .HYDROLOGY... FLASH FLOOD WATCH HAS BEEN ISSUED FOR MUCH OF P.R. THIS MORNING... ND AGAIN ISOLATED AREAS OF 5-7 INCHES ARE POSSIBLE TODAY...BUT WIDESPREAD AREA OF CONVECTION MOVING ACROSS EASTERN P.R. ATTM COULD LEAD TO WIDESPREAD AREA OF 2-4 INCHES AND CAUSE SOME FLOODING PROBLEMS PRIOR TO MAX HEATING. DUE TO THIS FOCUSING OF RAINFALL ALREADY...FLASH FLOOD POTENTIAL LOOKS HIGHER TODAY THAN YESTERDAY... FOR AT LEAST THE EAST HALF OF P.R. && .PRELIMINARY POINT TEMPS/POPS... SJU 84 72 85 73 / 60 50 50 50 STT 83 71 84 72 / 50 40 40 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...FFA PRZ001-004-006-007-009>011. VI...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 600 AM AST TUE APR 20 2004 PRZ001>013-AMZ710>750-211000- 600 AM AST TUE APR 20 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO. .TODAY AND TONIGHT...WIDESPREAD SHOWERS AND SCATTERED THUNDERSTORMS ASSOCIATED WITHE LOW TO UPPER LEVEL TROUGH WILL AFFECT THE ISLAND OF PUERTO RICO TODAY. RAINFALL ACCUMULATIONS OF AROUND 3 INCHES PER HOUR ARE POSSIBLE OVER LOCALIZED AREAS. THIS CONDITION HAS THE POTENTIAL TO PRODUCE FLASH FLOODING...AND COULD ALSO PRODUCE SOME RIVER FLOODING. LONG PERIOD EAST NORTHEAST SWELLS WILL CONTINUE ACROSS THE LOCAL ATLANTIC WATERS AND CARIBBEAN PASSAGES. SWELLS WILL BECOME NORTHEAST AS THEY SUBSIDE SLOWLY TONIGHT. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED. .WEDNESDAY THROUGH MONDAY...UNSTABLE ATMOSPHERIC CONDITIONS AND PLENTY OF LOW LEVEL HUMIDITY WILL CONTINUE AT LEAST WEDNESDAY AND THURSDAY TO PRODUCE SCATTERED TO NUMEROUS SHOWERS MAINLY ACROSS THE INTERIOR AND WEST SECTIONS OF THE ISLAND. VIZ001-002-AMZ710>730-211000- 600 AM AST TUE APR 20 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS. .TODAY AND TONIGHT...RAINFALL ACTIVITY OVER THE U.S. VIRGIN ISLANDS WILL BE LESS COMPARED WITH YESTERDAYS AS IT MOVES WEST TOWARD PUERTO RICO. HOWEVER...HIGH CONCENTRATION OF LOW LEVEL MOISTURE WILL CONTINUE OVER THE LOCAL AREA TODAY. SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS MAY PRODUCE URBAN AND SMALL STREAM FLOODING. LONG PERIOD EAST NORTHEAST SWELLS WILL CONTINUE TO AFFECT THE LOCAL ATLANTIC WATERS AND THE EASTERN CARIBBEAN PASSAGES THROUGH TODAY. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. .WEDNESDAY THROUGH MONDAY...WEATHER CONDITIONS WILL CONTINUE TO IMPROVE ON WEDNESDAY THROUGH THE WEEKEND. 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 heavy rain. Local standard time, as filed.
Flooded roads were reported in San Juan along Baldorioty and Roberto H . Todd Avenues. Small creek San Jose was reported close to overflowing its banks.
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 2026-10-01. Each event’s entry at NCEI: 5390262.