A trough of low pressure extended from the Central Atlantic southwestward to Hispaniola. Widespread numerous showers and scattered thunderstorms developed mainly across the central interior and north central.
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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 episode as NWS SJU wrote it up.
A trough of low pressure extended from the Central Atlantic southwestward to Hispaniola. Widespread numerous showers and scattered thunderstorms developed mainly across the central interior and north central. Runoff from the heavy rainfall that occurred across parts of the north central section caused river Cibuco to go out its banks causing river flooding. By late afternoon on Sunday showers and thunderstorms that developed across the interior northwest caused heavy rain that produced urban and river flooding in the Aguadilla and Aguada area during the evening.
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 6, 4:33 PM AST, 42 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 433 PM AST SUN MAY 6 2007 .SYNOPSIS...A TROUGH EXTENDS SOUTHWEST FROM A LOW PRESSURE JUST EAST OF NORTH CAROLINA INTO THE WESTERN CARIBBEAN. A JET OF EAST NORTHEAST WINDS WITH 90 KNOTS WAS CENTERED AT 24.5 NORTH 63.5 WEST. THE LOW WILL SHIFT SOUTHWEST AND CAUSE A RIDGE TO BUILD AT 60 DEGREES WEST AND THE JET FOCUS TO MOVE WESTWARD SUCH THAT BY TUESDAY ITS CORE IS BETWEEN THE BAHAMAS AND HAITI. BY THE WEEKEND...HIGH PRESSURE WILL SPREAD FROM THE EAST OVER THE CARIBBEAN THE LOW WILL HAVE MOVED INTO THE CENTRAL ATLANTIC AND THE JET WILL HAVE SHIFTED NORTH AND AWAY FROM THE LOCAL AREA. EARLY IN THE FOLLOWING WEEK HIGH PRESSURE WILL DOMINATE THE EASTERN CARIBBEAN. AT MID LEVELS...STRONG LOW PRESSURE IS MOVING DOWN THE EAST COAST OF THE UNITED STATES AND WILL BREAK OFF FROM A LONG WAVE TROUGH OVER THE NORTHWEST ATLANTIC. MEANWHILE HIGH PRESSURE RIDGES IN DUE EAST FROM AFRICA. THE LOW WILL BEGIN TO WEAKEN AFTER TONIGHT...BUT WILL REMAIN FAIRLY STRONG THROUGH WEDNESDAY. BY THURSDAY...HIGH PRESSURE WILL BE OVER OR JUST NORTHEAST OF THE WINDWARD ISLANDS AND THE LOW PRESSURE WILL BE JUST EAST OF JACKSONVILLE FLORIDA. ON FRIDAY THE LOW WILL WEAKEN AND EXIT RAPIDLY TO THE EAST NORTHEAST ALLOWING HIGH PRESSURE TO RIDGE INTO THE WESTERN ATLANTIC. AT LOWER LEVELS...A 1030 MB HIGH CENTERED OVER THE NORTHEAST ATLANTIC EXTENDED WEST SOUTHWEST...WEAKLY TOUCHING PUERTO RICO. A STRONG LOW PRESSURE IS FORMING JUST EAST OF NORTH CAROLINA AND A WEAKER LOW IS NORTH OF THE LEEWARD ISLANDS NEAR 29 NORTH. MONDAY AND TUESDAY THE STRONG LOW WILL MOVE SOUTHWEST WHILE THE HIGH PRESSURE NOSES TOWARD THE BAHAMAS. SINCE HIGH PRESSURE MOVES LITTLE FLOW OVER THE ISLAND WILL ALSO CHANGE LITTLE...BUT WILL KEEP PUMPING PATCHES OF MOISTURE OVER THE AREA. && .DISCUSSION...WIDESPREAD SHOWERS AND THUNDERSTORMS COVERED MOST OF PUERTO RICO FROM CABO ROJO TO TRUJILLO ALTO AND FROM CAMUY TO AGUAS BUENAS. PRECIPITABLE WATER ON THE PROFILER EDGED UP FROM THIS MORNINGS 1.8 INCHES AT 12Z TO A 2.0 READING AT 20Z...AND SHOWERS CONTINUE TO FIRE. FLOW HAS BEEN LIGHT ENOUGH TO KEEP SHOWERS FROM MOVING FAR FROM WHERE THEY BEGAN BUT FLOW ABOVE 10 THOUSAND FEET HAS BEEN CAUSING THE SHOWERS TO BUILD EAST NORTHEAST AND HAS SPREAD LIGHT RAIN EAST OF BAYAMON INTO SAN JUAN TRUJILLO ALTO AND CAROLINA. THE DEEPENING LOW OFF THE EAST COAST OF THE UNITED STATES WILL KEEP A BROAD TROUGH OVER THE AREA FOR QUITE SOME TIME TO COME AND LITTLE CHANGE IS EXPECTED IN THE LIGHT FLOW OR THE CONSIDERABLE MOISTURE OVER THE AREA. THE GFS SHOWS THE BEST PRECIPITABLE WATER OVER PUERTO RICO TO BE ON TUESDAY NIGHT. THEN WE HAVE AN UNSTEADY DROP FROM A HIGH OF 2.07 TO 1.63 AT 12Z ON SATURDAY. MOISTURE RETURNS ON SUNDAY AT ANY RATE. THIS WILL KEEP SHOWERS IN THE FORECAST AND CATEGORICAL RAINS OVER NORTHWEST CENTRAL PUERTO RICO MONDAY THROUGH WEDNESDAY. FROM THERE SHOWERS TAPER OFF UNTIL SUNDAY. TEMPERATURES ARE SEASONAL BUT WILL DEPEND ON THE AMOUNT OF MORNING CLOUDINESS THAT IS HAD OVER ANY GIVEN AREA. WITH SOUTH FLOW TEMPERATURES ON THE NORTH COAST WILL BE ABLE TO RISE TO NORMAL IN SPITE OF CLOUDINESS. && .AVIATION...SHOWERS AND THUNDERSTORMS WILL BE PREVALENT IN THE AFTERNOONS OVER THE NORTHWEST THREE QUARTERS OF PUERTO RICO NOW THROUGH WEDNESDAY AND WILL CONTINUE THROUGH THE END OF THE WEEK TO A LESSER DEGREE. THE STRONG LOW PRESSURE APPROACHING FLORIDA WILL GROW BANDS OF RAIN ACROSS MUCH OF THE WESTERN ATLANTIC EN ROUTE TO MIAMI. && .MARINE...SWELL FROM THE LOW PRESSURE WILL NOT ARRIVE UNTIL MONDAY...BUT WILL BE AS HIGH AS 4 TO 5 FEET. THIS WILL KEEP SEAS AT LEAST AS HIGH THROUGH TUESDAY...BUT SEAS TAPER OFF TO 3 FEET IN BOTH THE ATLANTIC AND THE CARIBBEAN BY SUNDAY. MARINERS WILL NEED TO TAKE PRECAUTIONS IN THE VICINITY OF THUNDERSTORMS DUE TO LIGHTNING AND GUSTY WINDS. && .HYDROLOGY...RIVERS HAVE SHOWN SOME RISE TODAY...THOUGH NONE HAS ENTERED FLOOD AS YET. RADAR IS SHOWING STRONGER SIGNALS THAN ACTUALLY HAPPENING SO RAINFALL EVENT APPEARS WORSE ON RADAR THAN IS ACTUALLY FALLING IN THE GAGES. NEVERTHELESS AS SHOWERS CONTINUE FOR MORE THAN 3 HOURS SOME MINOR FLOODING IS OCCURRING. THIS SITUATION IS EXPECTED TO INCREASE ON MONDAY AND MAY BE AS STRONG ON WEDNESDAY BY CURRENT ESTIMATIONS. SOME RIVER FLOODING MAY OCCUR THEN. && .PRELIMINARY POINT TEMPS/POPS... SJU 75 87 75 85 / 20 40 40 40 STT 76 83 76 82 / 30 50 50 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...FLS NORTH CENTRAL PUERTO RICO. VI...NONE. && 17/12
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN P600 AM AST SUN MAY 06 2007 PRZ001>013-AMZ710>750-071000- 600 AM AST SUN MAY 06 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO. .TODAY AND TONIGHT...AMPLE LOW LEVEL MOISTURE WILL COMBINE WITH DAYTIME HEATING AND LOCAL TERRAIN EFFECTS...RESULTING IN SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS ACROSS PUERTO RICO TODAY. EXPECT THE MOST NUMEROUS SHOWERS TO DEVELOP OVER THE WESTERN...NORTHWESTERN AND INTERIOR SECTIONS OF PUERTO RICO THIS AFTERNOON. THE HEAVIEST OF THESE SHOWERS AND THUNDERSTORMS MAY LEAD TO LOCAL URBAN AND SMALL STREAM FLOODING. .DAYS TWO THROUGH SEVEN...EXPECT PASSING SHOWERS AND DIURNAL SHOWER ACTIVITY TO CONTINUE ACROSS THE ISLANDS THROUGH THE MIDDLE OF THE WEEK...WITH THE MOST NUMEROUS SHOWER ACTIVITY EXPECTED OVER THE INTERIOR AND WESTERN SECTIONS OF PUERTO RICO. SOMEWHAT DRIER AND MORE STABLE AIR IS FORECAST TO INVADE THE REGION TOWARDS THE END OF THE WEEK. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED TODAY. VIZ001-002-AMZ710>730-071000- 600 AM AST SUN MAY 06 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS. .TODAY AND TONIGHT...PASSING SHOWERS WILL CONTINUE TO AFFECT THE LOCAL ISLANDS FROM TIME TO TIME. SOME OF THESE SHOWERS WILL PRODUCE BRIEF PERIODS OF HEAVY DOWNPOURS WHICH WILL CAUSE HAZARDOUS DRIVING CONDITIONS AND MAY LEAD TO PONDING OF WATER ON ROADWAYS AND SLOW DRAINAGE OF CREEKS AND GUTS. .DAYS TWO THROUGH SEVEN...INTERVALS OF TRADE WIND SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED TO CONTINUE THROUGH THE MIDDLE OF THE WEEK. SOMEWHAT DRIER AND MORE STABLE AIR IS FORECAST TO INVADE THE REGION TOWARDS THE END OF THE WEEK. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION NOT ANTICIPATED TODAY. 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 FROM YOUR PDA/PHONE: HTTP://MOBILE.SRH.NOAA.GOV OR WWW.SRH.NOAA.GOV/WML SR
The San Juan radar (TJUA), 43 km away, was scanning. The volume nearest the first event began at 21:16 UTC.
2 flood, 1 flash flood, 1 heavy rain. Local standard time, as filed.
River Cibuco was reported out of its banks and flooding road 620 in Vega Alta.
Urban flooding was reported along road 443 in Camaseyes, Aguadilla. One home was reported flooded.
The USGS river level sensor along the Culebrinas river at Margarita Dam in Aguada showed that the river had begun to flow out its banks. At 248 AST Monday local emergency managers indicated that the water levels of the Culebrinas river were just below flood stage.
At 2145 AST river Cibuco was reported still out of its banks and flooding road 676 in Vega Alta. One car was reported stranded in water. Around 2345 AST the USGS river level sensor along River Cibuco in Vega Alta showed the water level falling.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2007Every state in 2007This day in weather historyWarnings in Puerto Rico, May 2007
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: 34353, 34355, 34456, 34439.