Showers and thunderstorms developed across western Puerto Rico and across the San Juan Metropolitan area. These activity was due to sea breeze convergence, diurnal heating and orographic effects.
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.
Showers and thunderstorms developed across western Puerto Rico and across the San Juan Metropolitan area. These activity was due to sea breeze convergence, diurnal heating and orographic effects.
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 Aug 29, 2:56 PM AST, 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 256 PM AST THU AUG 29 2013 .SYNOPSIS...UPPER LEVEL RIDGE EXPECTED TO CONTINUE NORTH OF THE LOCAL AREA UNTIL LATE TO NIGHT...BEFORE AN UPPER TROUGH MOVES IN FROM THE NORTHEAST LATE TONIGHT INTO FRIDAY. THIS WILL CREATE MORE UNSTABLE CONDITIONS ON FRIDAY AS A TROPICAL WAVE ALSO APPROACHES THE LOCAL AREA ON FRIDAY. THIS COMBINATION SHOULD LEAD TO AN INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY TONIGHT INTO FRIDAY. THEREAFTER...AFTERNOON CONVECTION IS EXPECTED OVER PUERTO RICO...ESPECIALLY ACROSS THE INTERIOR AND WESTERN SECTIONS OF PUERTO RICO. && .DISCUSSION...SHOWERS AND THUNDERSTORMS DEVELOPED ACROSS WESTERN PUERTO RICO AND ACROSS THE SAN JUAN METROPOLITAN AREA. THE FORMER WERE DUE TO SEA BREEZE CONVERGENCE...DIURNAL HEATING AND OROGRAPHIC LIFTING...THE LATTER WERE DUE TO A PERSISTENT STREAMER OFF THE HIGHER ELEVATIONS OF EASTERN PUERTO RICO...CAUSING FLOODING OF URBAN AND POOR DRAINAGE AREAS. RAIN IS EXPECTED ACROSS THE LOCAL ISLANDS THROUGH THE WEEKEND...MOSTLY ON FRIDAY WITH SATURDAY HAVING AFTERNOON CONVECTION ACROSS WESTERN AND INTERIOR PUERTO RICO. SUNDAY AND MONDAY APPEARS TO BE THE DRIEST DAYS OF THE NEXT 7 DAYS WITH PRECIPITABLE WATER DROPPING DOWN TO UNDER 1.4 INCHES ACCORDING TO THE GFS. THE EXPECTED PATTERN FOR NEXT WEEK LOOKS RAINY STARTING ON TUESDAY...WHEN THE GFS SHOWS A SHARP INCREASE IN PRECIPITABLE WATER FOR THE REST OF THE WEEK...WITH VALUES OVER 2 INCHES. && .AVIATION...SHRA/TSRA ACTIVITY AFFECTING TJBQ AND THE VICINITY OF TJSJ EXPECTED TIL 29/22Z...LEAVING MAINLY VFR CONDS ACROSS THE LOCAL TERMINALS OVERNIGHT. PASSING SHRA EXPECTED OVERNIGHT AND INTO TOMORROW DUE TO APPROACHING TROPICAL WAVE. PERIODS OF REDUCED VISIBILITIES AND LOWER CIGS ARE POSSIBLE AS SHRA PASS OVER THE ISLANDS. WINDS TO REMAIN FROM THE E TO ESE OVERNIGHT. TEMPO GROUP AND PREVAILING SHRA WERE LEFT OUT OF TAF DUE TO SOME UNCERTAINTY BUT AN INCREASE IN SHRA ACTIVITY IS EXPECTED TONIGHT INTO FRIDAY. && .MARINE...MODERATE WINDS AND SEAS OF 2 TO 4 FEET ARE EXPECTED ACROSS THE LOCAL WATERS. SEAS UP TO 5 FEET ARE POSSIBLE ACROSS THE OFFSHORE ATLANTIC WATERS. LOCALLY FRESH WINDS AND SEAS 4 TO 6 FEET CAN BE EXPECTED DURING THE LABOR WEEKEND. && .PRELIMINARY POINT TEMPS/POPS... SJU 78 89 78 91 / 30 40 30 30 STT 79 90 80 89 / 40 30 40 40 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 09/25
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 606 AM AST THU AUG 29 2013 AMZ710>745-PRZ001>013-301015- 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- 606 AM AST THU AUG 29 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS WITH THUNDERSTORMS WILL DEVELOP ACROSS WEST AND NORTHWEST PUERTO RICO THIS AFTERNOON. THESE SHOWERS AND THUNDERSTORMS HAVE THE CAPABILITY OF PRODUCING MODERATE TO HEAVY RAINFALL WHICH MAY LEAD TO URBAN FLOODING. SHOWER AND THUNDERSTORM ACTIVITY WILL INCREASE TONIGHT AS TROPICAL WAVE MOVES ACROSS THE AREA. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY EARLY FRIDAY MORNING THROUGH FRIDAY NIGHT...A MID TO UPPER LEVEL TROUGH AND A TROPICAL WAVE WILL INTERACT OVER THE EASTERN CARIBBEAN TO PRODUCE CLOUDINESS AND SHOWERS WITH THUNDERSTORMS ACROSS THE LOCAL ISLANDS. PERIODS OF HEAVY RAINFALL AND URBAN AND SMALL STREAM FLOODING POSSIBLE. .SPOTTER INFORMATION STATEMENT...REPORTS OF LOCALLY HEAVY RAINFALL AND FLOOD ARE GREATLY APPRECIATED. AMZ715-725-VIZ001-002-301015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 606 AM AST THU AUG 29 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWER AND THUNDERSTORM ACTIVITY WILL INCREASE TONIGHT AS TROPICAL WAVE MOVES ACROSS THE AREA. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY EARLY FRIDAY MORNING THROUGH FRIDAY NIGHT...A MID TO UPPER LEVEL TROUGH AND A TROPICAL WAVE WILL INTERACT OVER THE EASTERN CARIBBEAN TO PRODUCE CLOUDINESS AND SHOWERS WITH THUNDERSTORMS ACROSS THE LOCAL ISLANDS. PERIODS OF HEAVY RAINFALL AND URBAN AND SMALL STREAM FLOODING POSSIBLE. .SPOTTER INFORMATION STATEMENT...SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN JUAN PR 253 PM AST THU AUG 29 2013 PRC001-003-005-011-071-081-083-099-131-141-292000- ANASCO PR-LARES PR-MOCA PR-UTUADO PR-SAN SEBASTIAN PR-ADJUNTAS PR- LAS MARIAS PR-AGUADILLA PR-ISABELA PR-AGUADA PR- 253 PM AST THU AUG 29 2013 AT 243 PM AST...NATIONAL WEATHER SERVICE METEOROLOGIST DETECTED A CLUSTER OF STRONG THUNDERSTORMS DEVELOPING OVER THESE AREAS AND MOVING WEST NORTHWEST AROUND 15 MPH. THE STRONGEST STORMS WERE IN AND AROUND LARES AND SAN SEBASTIAN. HEAVY RAINS WILL CONTINUE TO FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. INTENSE LIGHTNING IS OCCURRING WITH THESE STORMS AS WELL AS THE POSSIBILITY OF STRONG GUSTY WINDS. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THESE THUNDERSTORMS PASS BY. RAM
COMUNICADO ESPECIAL SOBRE LAS CONDICIONES DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 253 PM AST JUEVES 29 DE AGOSTO DE 2013 PRC001-003-005-011-071-081-083-099-131-141-292000- ANASCO PR-LARES PR-MOCA PR-UTUADO PR-SAN SEBASTIAN PR-ADJUNTAS PR- LAS MARIAS PR-AGUADILLA PR-ISABELA PR-AGUADA PR- 253 PM AST JUEVES 29 DE AGOSTO DE 2013 A LAS 2:43 PM AST...METEOROLOGOS DEL SERVICIO NACIONAL DE METEOROLOGIA DETECTARON UNA AREA DE TRONADAS FUERTES DESARROLLANDOSE SOBRE ESTAS AREAS Y MOVIENDOSE AL OESTE NOROESTE A 15 MPH. LAS TRONADAS MAS FUERTES ESTAN OCURRIENDO ALREDEDOR DE LARES Y SAN SEBASTIAN. LLUVIAS FUERTES PUDIERAN INUNDAR AREAS BAJAS TALES COMO BADENES Y ALCANTARILLAS. EVITE ESTAS AREAS Y NO INTENTE CRUZAR CALLES NI CARRETERAS INUNDADAS YA QUE PUDIERA SER ARRASTRADO POR LAS CORRIENTES DE AGUA. LOS NIVELES DE AGUA DE RIACHUELOS Y RIOS PUDIERAN AUMENTAR TAMBIEN...POR LO QUE SE LES RECOMIENDA QUE BUSQUEN LUGARES MAS ALTOS. SE REPORTAN RELAMPAGOS INTENSOS CON ESTAS TRONADAS AL IGUAL QUE LA POSIBILIDAD DE RAFAGAS FUERTES. SI SE ENCUENTRA EN EL EXTERIOR...ALEJESE DE LOS OBJETOS ALTOS TALES COMO ARBOLES. MUEVASE A UN EDIFICIO SI ES POSIBLE. SI SE ENCUENTRA EN EL INTERIOR... MANTENGASE ALEJADO DE VENTANAS Y PUERTAS Y EVITE USAR TELEFONOS A MENOS QUE SEA UNA EMERGENCIA. TRATE DE DESCONECTAR ENSERES ELECTRICOS ANTES DE LA LLEGADA DE LA TRONADA. RAM/ACP
The San Juan radar (TJUA), 30 km away, was scanning. The volume nearest the first event began at 19:34 UTC.
4 flash flood, 1 heavy rain. Local standard time, as filed.
Santa Rosa sector, Sierra Linda sector, and Lomas Verdes were reported flooded.
Road PR-19 in front of Garden Hills sector was reported flooded.
Rio Puerto Nuevo was reported out of its banks.
Anchor Meteorologist reported very heavy rainfall at WLII TV station Channel 11 in Guaynabo. 4.52 inches were reported at the station.
San Claudio Avenue was reported flooded an impassable.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2013Every state in 2013This day in weather historyWarnings in Puerto Rico, August 2013
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: 475609, 475822, 475883, 475884, 475885.