along with isolated thunderstorms which produced heavy rain across northeastern Puerto Rico.
Every event with a place to put it. Tap one for its entry below.
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.
Bands of moisture along a frontal boundary and the proximity of a mid to upper level trough , resulted in widespread areas of moderate to locally heavy rainfall...along with isolated thunderstorms which produced heavy rain across northeastern Puerto Rico.
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 2, 5:29 AM AST, 3 hours 17 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 529 AM AST SUN MAY 2 2010 .SYNOPSIS...AT UPPER LEVELS...A CUT-OFF LOW WILL FORM IN A DIGGING TROUGH...EXTENDING SOUTHWEST THROUGH THE MONA PASSAGE INTO THE CARIBBEAN...AND MOVE RAPIDLY SOUTHWEST MONDAY AND THEN WEST ON TUESDAY BEFORE CROSSING CUBA AND BEING ABSORBED INTO ANOTHER TROUGH ON THURSDAY. HIGH PRESSURE WILL BUILD OVER THE EASTERN CARIBBEAN ON TUESDAY AND EXTEND NORTH OVER PUERTO RICO ON WEDNESDAY. IT WILL MOVE OVER THE U.S. VIRGIN ISLANDS ON THURSDAY NIGHT AND INTO THE TROPICAL ATLANTIC ON SATURDAY. ON SATURDAY A TROUGH AT FLORIDA'S LATITUDE WILL PASS NORTH OF THE AREA WITH ANOTHER SHORT WAVE CROSSING THE LOCAL ISLANDS ON MONDAY. AT MID LEVELS...HIGH PRESSURE OVER CUBA WILL GIVE WAY TO THE WEAK CUT- OFF LOW THAT MOVES INTO THE CARIBBEAN FROM THE NORTHEAST ON MONDAY AND WILL RIDGE OVER FLORIDA TUESDAY. THE RIDGE WILL CONTINUE EAST ON TUESDAY AND WEDNESDAY WHILE A LOW FORMS IN THE TROPICAL ATLANTIC EAST OF THE WINDWARD ISLANDS. THE LOW WILL MOVE SLOWLY TO THE NORTHEAST DURING THE REST OF THE WEEK WHILE HIGH PRESSURE WRAPS AROUND IT. SOUTHWEST FLOW OVER THE LOCAL AREA WILL COMMENCE LATE IN THE WEEK AS A TROUGH DIGS INTO THE NORTHWESTERN CARIBBEAN. AT LOWER LEVELS...HIGH PRESSURE WILL REMAIN IN PLACE NORTH OF PUERTO RICO THROUGH WEDNESDAY NIGHT NEAR 28 NORTH LATITUDE. A FRONTAL BOUNDARY WILL ALSO SAG SOUTH TODAY...REFORM ON MONDAY TO THE NORTH AND PASS THROUGH THE AREA AGAIN ON TUESDAY BEFORE DRY AIR IS USHERED IN ON THURSDAY. A TROUGH WILL MOVE INTO THE AREA FROM THE EAST AND BRING MOISTURE BACK TO THE AREA ON FRIDAY AND SATURDAY OF THE UPCOMING WEEK. ALTHOUGH THE HIGH PRESSURE BREAKS OUT OF ITS LOCK ON THURSDAY AND BUILDS INTO THE CENTRAL ATLANTIC BY SATURDAY...THE LOCAL AREA NEVER BREAKS FREE OF THE RIDGE THAT EXTENDS WEST AND CROSSES FLORIDA WHICH MAINTAINS THE EASTERLY TRADE WIND FLOW OVER PUERTO RICO AND THE U.S. VIRGIN ISLANDS. && .DISCUSSION...CONSIDERABLE SHOWER ACTIVITY DEVELOPED JUST NORTH OF PUERTO RICO...CULEBRA...SAINT THOMAS AND SAINT JOHN AND SETTLED SOUTH OVER THE ISLANDS EARLY THIS MORNING. AS MUCH AS 1.5 TO 2 INCHES MAY HAVE FALLEN IN ONE AREA OF CAROLINA BUT MOST AREAS ON THE NORTH COAST OF PUERTO RICO AND AREAS DIRECTLY EAST RECEIVED A MEASURABLE AMOUNT OF LESS THAN ONE INCH. WATER VAPOR IMAGERY SHOWS THE UPPER LEVEL TROUGH FORMING OVER THE EASTERN DOMINICAN REPUBLIC AND IT IS EXPECTED THAT THE UPPER LEVEL CUT-OFF LOW WILL SOON APPEAR. THE FRONTAL BOUNDARY IS SLOWING ITS SOUTHWARD SINK AND IT IS LIKELY THAT IT WILL STILL BE ENCOUNTERED OVER CENTRAL PUERTO RICO BY 18Z. THIS SHOULD BE IDEAL FOR THE DEVELOPMENT OF SHOWERS AND SCATTERED THUNDERSTORMS IN THAT AREA AND IT IS LIKELY THAT SOME AREAS OF WESTERN AND INTERIOR PUERTO RICO WILL HAVE SOME URBAN AND SMALL STREAM FLOODING...AND PERHAPS SOME RIVER RISES IF ENOUGH HEATING DEVELOPS. HAVE HELD OFF ON ISSUING A FLASH FLOOD WATCH FOR THE AREA DUE TO LACK OF UPPER LEVEL DYNAMICS AFTER 02/12Z AND UNCERTAINTY OF MID LEVEL MOISTURE. IT MAY STILL BE NECESSARY SHOULD THE 12Z SOUNDING SHOW FAVORABLE CONDITIONS. THE BOUNDARY MOVES SOUTH AND FADES TONIGHT. THE GFS AND NAM BRING MOISTURE BANDS FROM THE EAST OVER THE AREA ON MONDAY...WHILE THE ECMWF HOLD A GENERALLY MOIST ATMOSPHERE OVER THE AREA UNTIL DRYER AIR FORCES IT OUT AND AWAY TO THE SOUTHWEST TUESDAY NIGHT AND WEDNESDAY. THE ECMWF ALSO BRINGS THE SAME BOUNDARY BACK ON FRIDAY WHILE THE GFS BRINGS IN WAVES OF MOISTURE THAT CONTINUE FROM FRIDAY TO THE FOLLOWING TUESDAY...LIKELY RIGHT ON THROUGH MID- MONTH. MEANWHILE FAVORABLE MJO CONDITIONS SHOW NO SIGN OF LEAVING THE AREA SOON. IN ANY CASE EXPECT WET CONDITIONS ACROSS THE AREA UNTIL TUESDAY NIGHT OR WEDNESDAY AS THE SECOND CLIMATOLOGICALLY WETTEST MONTH IN SAN JUAN AND MUCH OF THE AREA MAKES ITS ENTRANCE. && .AVIATION... SHRA OR VCSH CONDITIONS WILL PREVAIL ACROSS TJSJ...TJBQ...TIST THROUGH 02/18Z WITH TEMPORARY PERIODS OF MVFR. TJMZ WILL REMAIN VFR THROUGH 02/16Z...SHOWERS AND ISOLATED THUNDERSTORMS WILL DEVELOP AROUND 02/17-02/21. TJPS AND TISX VFR THROUGH 02/17Z WITH VCNTY SHWRS REST OF PERIOD. LLVL WIND FLOW ENE AT 15 TO 20 KTS WITH GUSTS. && .MARINE...SEAS ARE EXPECTED TO INCREASE SOMEWHAT WITH WINDS BUT SHOULD IN GENERAL REMAIN JUST BELOW SMALL CRAFT ADVISORY CONDITIONS. SEAS IN THE ATLANTIC DIMINISH TUESDAY THROUGH SATURDAY...BUT INCREASE A LITTLE IN THE CARIBBEAN LATE IN THE WEEK. && .PRELIMINARY POINT TEMPS/POPS... SJU 87 76 88 76 / 60 40 50 70 STT 86 78 87 78 / 60 40 50 60 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 07/12
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 634 AM AST SUN MAY 2 2010 AMZ710>745-PRZ001>013-031045- SAN JUAN AND VICINITY-NORTHEAST-SOUTHEAST-EASTERN INTERIOR- NORTH CENTRAL-CENTRAL INTERIOR-PONCE AND VICINITY-NORTHWEST- WESTERN INTERIOR-MAYAGUEZ AND VICINITY-SOUTHWEST-CULEBRA-VIEQUES- THE NEARSHORE AND OFF SHORE ATLANTIC AND CARIBBEAN COASTAL WATERS- 634 AM AST SUN MAY 2 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS WILL BE THE RULE ACROSS THE NORTHERN THIRD OF MAINLAND PUERTO RICO THIS MORNING WITH ISOLATED SHOWERS EXPECTED ACROSS THE WEST AND SOUTHERN PORTIONS OF THE ISLAND. SHOWERS WILL BECOME SCATTERED ACROSS THE NORTHERN THIRD OF MAINLAND PUERTO RICO LATER THIS MORNING. HOWEVER...SHOWERS AND THUNDERSTORMS ARE EXPECTED TO BECOME MORE NUMEROUS THIS AFTERNOON ACROSS THE INTERIOR...WEST AND SOUTHWEST SECTIONS OF PUERTO RICO. HEAVY SHOWERS WILL RESULT IN AREAS OF AT LEAST SOME URBAN AND SMALL STREAM FLOODING. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE AFTERNOONS ACROSS DIURNALLY FAVORED SECTIONS OF PUERTO RICO. THESE SHOWERS WILL BE CAPABLE OF PRODUCING AREAS OF LOCALLY HEAVY RAIN. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED. AMZ715-725-VIZ001-002-031045- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 634 AM AST SUN MAY 2 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE THROUGH MOST OF THIS MORNING WITH PERIODS OF HEAVY RAINFALL POSSIBLE. FLOODING OF LOW LYING AND POOR DRAINAGE AREAS ARE LIKELY. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The San Juan radar (TJUA), 35 km away, was scanning. The volume nearest the first event began at 12:44 UTC.
3 flash flood. Local standard time, as filed.
Road 191 towards El Yunque rainforest was reported flooded and impassable.
River Rio Fajardo overflowed its banks, flooding areas of the the Paraiso sector.
River Rio Fajardo overflowed its banks, flooding the intersection of highways 53 and 3.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2010Every state in 2010This day in weather historyWarnings in Puerto Rico, May 2010
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: 228651, 228657, 228660.