Surface low pressure combined with a strong southeasterly wind flow which produced active weather across the north section of 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.
Surface low pressure combined with a strong southeasterly wind flow which produced active weather across the north section of 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 Sep 19, 3:12 PM AST, 1 hour 12 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTED NATIONAL WEATHER SERVICE SAN JUAN PR 312 PM AST THU SEP 19 2013 .SYNOPSIS...SURFACE LOW PRESSURE NORTH OF THE AREA WILL CONTINUE TO SLOWLY MOVE TO THE EAST THEN NORTHEAST THIS WEEKEND...CAUSING LIGHT WINDS LOCALLY. UPPER TROUGH WILL DIG DOWN FRIDAY AND SATURDAY OVER CUBA AND HISPANIOLA...CAUSING INSTABILITY OVER THE LOCAL AREA AT THE UPPER LEVELS...WHICH IN COMBINATION OF THE ABUNDANT AVAILABLE MOISTURE AND LOCAL EFFECTS...WILL LIKELY PRODUCE NUMEROUS SHOWERS AND A FEW THUNDERSTORMS ACROSS THE LOCAL AREA ON FRIDAY AND SATURDAY. && .DISCUSSION...A FEW SHOWERS DEVELOPED TODAY BUT NOT MUCH IN TERMS OF COVERAGE OR INTENSITY AS OF 3 PM AST TODAY. MOST OF THE SHOWERS WERE LIMITED TO THE NORTH CENTRAL AND NORTHWESTERN SECTIONS OF PUERTO RICO. IT WAS A VERY WARM DAY TODAY AS LIGHT SOUTHEASTERLY WINDS AND ABUNDANT SUNSHINE CAUSED A RECORD BREAKING MAX TEMPERATURE AT THE SAN JUAN INTERNATIONAL AIRPORT WITH 95 DEGREES. AN INCREASE IN MOISTURE AND UPPER LEVEL INSTABILITY IS EXPECTED STARTING TOMORROW INTO FRIDAY AND THE UPPER TROUGH DIGS TO THE WEST OF THE LOCAL AREA. NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS ARE FORECAST ACROSS PORTIONS OF PUERTO RICO ON FRIDAY AND SATURDAY. THE STEERING WINDS WILL BE VERY LIGHT SO THE SHOWERS THAT DO DEVELOP WILL LIKELY STAY OVER ANY ONE POINT FOR ENOUGH TIME TO CAUSE URBAN AND SMALL STREAM FLOODING ON BOTH FRIDAY AND SATURDAY. SUNDAY STILL LOOKS LIKE A BETTER DAY WEATHER WISE AS MOISTURE DECREASES SIGNIFICANTLY AND THE UPPER TROUGH WEAKENS SOMEWHAT AND MOVES CLOSER TO THE LOCAL AREA. FOR THE EARLY PART OF NEXT WEEK....SHOWERS AND THUNDERSTORM DEVELOPMENT IN THE AFTERNOONS WILL LIKELY BE LIMITED TO THE WESTERN SECTIONS OF PUERTO RICO WHICH IS TYPICAL FOR THIS TIME OF YEAR. && .AVIATION...VFR CONDS WILL PREVAIL AT ALL TAF SITES DURG THE ENTIRE PRD. SOME EARLY MORNING PASSING -SHRA DURNG EARLY MORNING MAINLY BTW ERN PR AND NRN LEEWARDS...BUT NO SIG FLYING HAZARDS ATTM. SFC WINDS WILL REMAIN LGT AND VRB OVERNIGHT BCMG LGT SLY AND VEERING W/HT AFT 20/14Z. AFT 20/16Z...EXPECT DIURNALLY INDUCED CONVECTION MAINLY ACROSS PARTS OF THE INTERIOR AND NORTHERN HALF OF PR TIL AT LEAST 20/21Z. AS A RESULT BRIEF MVFR/IFR COND PSBL MAINLY VCNTY OF TJSJ...TJBQ...TJNR DURG AFTN. && .MARINE...MARINE CONDITIONS REMAIN BELOW SMALL CRAFT ADVISORY CRITERIA. SHOWERS AND THUNDERSTORMS EXPECTED TO DEVELOP ON FRIDAY AND SATURDAY MAY PRODUCE GUSTY WINDS AND FREQUENT LIGHTNING FROM TIME TO TIME. && .PRELIMINARY POINT TEMPS/POPS... SJU 79 90 77 91 / 20 60 20 60 STT 79 88 78 87 / 30 30 20 20 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 09/25
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 529 AM AST THU SEP 19 2013 AMZ710>745-PRZ001>013-200930- 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- 529 AM AST THU SEP 19 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT IN THE AFTERNOON...SHOWERS AND THUNDERSTORMS ARE EXPECTED OVER THE INTERIOR...NORTH CENTRAL AND NORTHWEST SECTIONS OF PUERTO RICO. THESE THUNDERSTORMS CAN PRODUCE BRIEF STRONG GUSTY WINDS...FREQUENT LIGHTNING AND HEAVY RAINFALL. URBAN AND SMALL STREAM FLOODING IS EXPECTED WITH THE HEAVIEST SHOWERS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY FOR FRIDAY AND SATURDAY...AN UPPER LEVEL TROUGH AND SOUTHERLY WIND FLOW AT THE SURFACE WILL ENHANCE THE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS NORTH OF THE CORDILLERA CENTRAL. RAINFALL FROM THIS ACTIVITY CAN LEAD TO ISOLATED FLASH FLOODING IN THE NORTHERN HALF OF THE ISLAND. .SPOTTER INFORMATION STATEMENT... ANY REPORTS OF STRONG WINDS...FLOODING AND HEAVY RAINFALL GREATER THAN 2 INCHES WOULD BE GREATLY APPRECIATED. AMZ715-725-VIZ001-002-200930- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 529 AM AST THU SEP 19 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN JUAN PR 411 PM AST THU SEP 19 2013 PRC021-031-033-061-127-192115- BAYAMON PR-GUAYNABO PR-SAN JUAN PR-CAROLINA PR-CATANO PR- 411 PM AST THU SEP 19 2013 AT 405 PM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SHOWERS AND THUNDERSTORMS OVER BAYAMON...GUAYNABO AND CATANO MOVING NORTHWEST AT 5 MPH. THESE THUNDERSTORMS ARE PRODUCING FREQUENT LIGHTNING AND HEAVY RAINFALL UP TO AN INCH PER HOUR. INTENSE LIGHTNING IS REPORTED WITH THIS STORM. 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 THE THUNDERSTORM APPROACHES. FIGUEROA
COMUNICADO ESPECIAL SOBRE LAS CONDICIONES DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 411 PM AST JUEVES 19 DE SEPTIEMBRE DE 2013 PRC021-031-033-061-127-192115- BAYAMON PR-GUAYNABO PR-SAN JUAN PR-CAROLINA PR-CATANO PR- 411 PM AST JUEVES 19 DE SEPTIEMBRE DE 2013 A LAS 4:05 PM AST...EL RADAR DOPPLER DEL SERVICIO NACIONAL DE METEOROLOGIA INDICO AGUACEROS Y TRONADAS FUERTES SOBRE BAYAMON...GUAYNABO Y CATANO MOVIENDOSE HACIA EL NOROESTE A 5 MPH. ESTAS TRONADAS ESTAN PRODUCIENDO RAYOS FRECUENTES Y LLUVIA FUERTE HASTA DE UNA PULGADA POR HORA. SE REPORTAN RAYOS INTENSOS CON ESTA TORMENTA. SI SE ENCUENTRA EN EL EXTERIOR DE UN EDIFICIO...MANTENGASE ALEJADO DE OBJETOS ALTOS COMO ARBOLES. MUEVASE AL INTERIOR DE UN EDIFICIO SI ES POSIBLE. FIGUEROA
The San Juan radar (TJUA), 36 km away, was scanning. The volume nearest the first event began at 20:21 UTC.
1 thunderstorm wind, 1 flood. Local standard time, as filed.
A wind gust of 38 mph was observed at the Luis Munoz Marin International Airport due to strong thunderstorms over the municipality of Carolina.
Urban flooding was reported at Santurce sector near Sagrado Corazon University.
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, September 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: 478865, 478869.