A TUTT affected the local islands with mid level high pressure building in from East. Strong thunderstorms began developing across the central interior with hail and strong gusty winds reported.
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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 TUTT affected the local islands with mid level high pressure building in from East. Strong thunderstorms began developing across the central interior with hail and strong gusty winds reported.
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 3, 11:43 AM AST, 4 hours 2 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1143 AM AST THU SEP 3 2015 .SYNOPSIS... WARM TEMPERATURES AND MOSTLY SUNNY SKIES PREVAILED THIS MORNING ACROSS THE LOCAL ISLANDS. THE DOPPLER WEATHER RADAR NOT DETECTED SHOWER ACTIVITY OVER LAND LATE THIS MORNING. TJSJ SOUNDING DATA OBSERVED STEEP LAPSE RATE AT THE 850-700MB LAYER...TODAYS VALUES ARE AROUND THE PERCENTILE 75TH FOR THE CURRENT MONTH. MID LEVEL TEMPERATURES...AT 500MB...HAVE VALUES AROUND -8 DEGREES CELSIUS. ANOTHER FACT IS THAT THE CURRENT SOUNDING DOES NOT HAVE ANY INVERSION. THE PROXIMITY OF AN UPPER LEVEL TROUGH WILL COMBINE WITH THE AVAILABLE MOISTURE TO PRODUCE POSSIBLE ISOLATED TO SCATTERED SHOWERS WITH MODERATE TO STRONG TSTORM OVER THE INTERIOR...NORTH AND WEST SECTIONS OF PUERTO RICO. IN ADDITION...UNDER THE PREVAILING SOUTHERLY WIND FLOW...THE DEVELOPMENT OF SHOWERS ARE POSSIBLE IN THE WAKE OF THE US VIRGIN ISLANDS. MINOR CHANGES WERE INTRODUCE TO THE PREVIOUS FORECAST BUT THE FORECAST DISCUSSION STILL IN GOOD AGREEMENT WITH THE NEW DATA. && .AVIATION...MAINLY VFR CONDS ACROSS ALL TAF SITE. MOUNTAIN OBSC WITH TSTORM ARE POSSIBLE OVER THE CORDILLERA CENTRAL...SOME OF OF THIS SHRA/TSRA ARE POSSIBLE OVER TJBQ/TJMZ/TJSJ AFT 03/18Z. AFT 0323Z...LIGHT PASSING SHOWERS MAY BE POSSIBLE OVER TIST/TISX/TJSJ/TNCM/TKPK FROM TIME TO TIME. WINDS FROM THE EAST- SOUTHEAST AT 10 TO 15 MPH WITH SEA BREEZE VARIATIONS...AND LOCALLY HIGHER IN/NEAR TSRA/SHRA. FOLLOWED BY CALM TO LIGHT AND VARIABLE WINDS AND LAND BREEZE VARIATIONS ALONG THE COASTAL SECTIONS AFT 0323Z. && .MARINE...SEAS ARE EXPECTED TO CONTINUE BELOW 4 FEET WITH EAST TO SOUTHEAST WINDS BETWEEN 10 TO 15 KNOTS. INCLEMENT WEATHER ARE POSSIBLE NEAR SHOWERS AND THUNDERSTORM THIS AFTERNOON. THE PREVIOUS MARINE FORECAST STILL IN EFFECT...REFER TO THE PREVIOUS DISCUSSION. && .PREV DISCUSSION... /ISSUED 429 AM AST THU SEP 3 2015/ SYNOPSIS...TUTT WILL MEANDER OVER AND NORTH OF THE FORECAST AREA THROUGH SUNDAY. BUILDING MID TO UPPER LEVEL RIDGE FROM THE EAST WILL BE THE DOMINANT WEATHER FEATURE FOR THE NEXT SEVERAL DAYS. LOW LEVEL PERTURBATIONS EXPECTED TO INCREASE MOISTURE ON LATE SATURDAY/SUNDAY AND BY MID-WEEK. DISCUSSION...MOSTLY CLEAR SKIES PREVAILED OVER LAND AREAS OVERNIGHT. A FEW SHOWERS WERE NOTED OVER THE MONA PASSAGE AND ACROSS THE OFFSHORE ATLANTIC WATERS. IN GENERAL...FOR THE NEXT SEVERAL DAYS EXPECT SHOWERS WITH ISOLATED THUNDERSTORMS TO DEVELOP MAINLY OVER THE INTERIOR AND WESTERN SECTIONS OF PR EACH AFTERNOON. ELSEWHERE...MOSTLY DRY AND FAIR WEATHER CONDITIONS ARE EXPECTED. MODEL GUIDANCE SUGGEST THAT BETWEEN SATURDAY/SUNDAY MOISTURE WILL INCREASE GRADUALLY...AND PASSING SHOWERS SHOULD BE MORE FREQUENT ON SATURDAY NIGHT ACROSS THE USVI AND EASTERN PR...WITH USUAL CONVECTION ALONG THE CORDILLERA CENTRAL AND WESTERN PR IN THE AFTERNOON HOURS. THEN...DRY AND FAIR WEATHER CONDITIONS WILL RETURN THROUGH AT LEAST MID-WEEK WHEN THE NEXT TROPICAL WAVE IS FORECAST TO BE NEAR THE LOCAL AREA. AVIATION...VFR XPCTD XCP MVFR IN ISOLD/SCT SHRA/TSRA INTERIOR/WEST PR DURING THU/FRI AFT WI FEW OBSCD MTNS. WIND BLW FL150 VRBL 10 KT OR LESS BCMG E TO NE UP TO 10 KT LATE TDY THRU FRI. MARINE...SEAS MAINLY BELOW 3 FEET AND EAST TO SOUTHEAST WINDS BETWEEN 10 TO 15 KNOTS EXPECTED THRU FRIDAY. SEAS EXPECTED TO INCREASE UP TO 4 FEET WITH GENTLE TO MODERATE TRADES BY EARLY NEXT WEEK. THERE IS A MODERATE RISK OF RIP CURRENTS TODAY ACROSS SOME BEACHES OF NORTHERN PR DUE TO A WEAK NORTHERLY GROUND SWELL. && .PRELIMINARY POINT TEMPS/POPS... SJU 78 90 78 91 / 10 10 30 30 STT 78 88 79 88 / 10 10 30 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. AM...NONE. && 27/23
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 1200 PM AST THU SEP 3 2015 AMZ710>745-PRZ001>013-041600- 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- 1200 PM AST THU SEP 3 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT .THUNDERSTORMS...THERE IS A CHANCE OF THUNDERSTORMS WITH HEAVY RAINFALL AND BRIEF GUSTY WINDS THIS AFTERNOON ACROSS PORTIONS OF THE NORTHERN...INTERIOR AND WESTERN SECTIONS OF PUERTO RICO. INTENSE THUNDERSTORMS OVER THESE AREAS COULD PRODUCE SMALL HAIL AND STRONG GUSTY WINDS. IN ADDITION...HEAVY RAINFALLS COULD LEAD TO URBAN AND SMALL STREAM FLOODING. .RIP CURRENTS...THERE IS A MODERATE RISK OF RIP CURRENTS ON THE FOLLOWING BEACHES OF NORTHERN PUERTO RICO: PINONES...OCEAN PARK...MAR CHIQUITA...PUERTO NUEVO AND JOBOS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY AT THIS TIME...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WIDESPREAD SPOTTER ACTIVATION IS NOT ANTICIPATED, HOWEVER INDIVIDUAL SPOTTER ARE ENCOURAGED TO REPORT HIGH WINDS...HAIL...FLOODING... WATERSPOUT...AND RIP CURRENTS TO THE NATIONAL WEATHER SERVICE IN SAN JUAN. AMZ715-725-VIZ001-002-041600- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 1200 PM AST THU SEP 3 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN JUAN PR 222 PM AST THU SEP 3 2015 PRZ006-032015- CENTRAL INTERIOR- 222 PM AST THU SEP 3 2015 ...A STRONG THUNDERSTORM WILL AFFECT OROCOVIS...COROZAL...COAMO... BARRANQUITAS...MOROVIS AND CIALES MUNICIPALITIES... AT 220 PM AST...A STRONG THUNDERSTORM WAS OVER OROCOVIS. THE STORM WAS NEARLY STATIONARY. WINDS IN EXCESS OF 30 MPH AND HALF INCH HAIL ARE POSSIBLE WITH THIS STORM. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. LAT...LON 1821 6627 1816 6631 1819 6651 1831 6647 TIME...MOT...LOC 1820Z 115DEG 4KT 1822 6639 CAM
COMUNICADO ESPECIAL SOBRE LAS CONDICIONES DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 222 PM AST JUEVES 3 DE SEPTIEMBRE DE 2015 PRZ006-032015- CENTRAL INTERIOR- 222 PM AST JUEVES 3 DE SEPTIEMBRE DE 2015 ...TRONADAS FUERTES CONTINUAN DESARROLLANDOSE Y AFECTANDO OROCOVIS...COROZAL...COAMO... BARRANQUITAS...MOROVIS Y CIALES. A LAS 2 PM AST...UNA FUERTE TRONADA ESTA AFECTANDO OROCOVIS. ESTA TRONADA SE ENCUENTRA CASI ESTACIONARIA. VIENTOS EN EXCESO DE 30 MPH SON POSIBLES CON ESTA TORMENTA. LLUVIA TORRENCIAL OCURRE CON ESTA TORMENTA...Y RESULTARAN EN INUNDACIONES LOCALIZADAS. NO MANEJE SU VEHICULO A TRAVES DE CARRETERAS INUNDADAS. RELAMPAGOS FRECUENTES ESTAN OCURRIENDO CON ESTA TORMENTA. LOS RAYOS PUEDEN CAER A 15 MILLAS DE LA TRONADA. BUSQUE REFUGIO SEGURO DENTRO DE UN VEHICULO O EDIFICIO. CAM/ER
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
315 PM AST THU SEP 3 2015
PRZ006-009-032115-
CENTRAL INTERIOR-WESTERN INTERIOR-
315 PM AST THU SEP 3 2015
...A STRONG THUNDERSTORM WILL AFFECT ADJUNTAS...UTUADO...MARICAO AND
JAYUYA MUNICIPALITIES...
AT 313 PM AST...A STRONG THUNDERSTORM WAS OVER ADJUNTAS. THE STORM
WAS NEARLY STATIONARY. WINDS IN EXCESS OF 40 MPH AND HALF INCH HAIL
ARE POSSIBLE WITH THIS STORM. TORRENTIAL RAINFALL IS ALSO OCCURRING
WITH THIS STORM...AND MAY CAUSE LOCALIZED FLOODING. DO NOT DRIVE
YOUR VEHICLE THROUGH FLOODED ROADWAYS.
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.
LAT...LON 1833 6682 1832 6680 1826 6661 1813 6670
1814 6677 1820 6690 1835 6688
TIME...MOT...LOC 1913Z 099DEG 2KT 1820 6672
ER/CAMCOMUNICADO ESPECIAL SOBRE LAS CONDICIONES DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 315 PM AST JUEVES 3 DE SEPTIEMBRE DE 2015 PRZ006-009-032115- CENTRAL INTERIOR-OESTE INTERIOR- 315 PM AST JUEVES 3 DE SEPTIEMBRE DE 2015 ...UNA TRONADA FUERTE AFECTARA LOS MUNICIPIOS DE ADJUNTAS...UTUADO...MARICAO Y JAYUYA... A LAS 3:13 PM AST...UNA FUERTE TRONADA ESTABA SOBRE ADJUNTAS. ESTA TRONADA SE ENCUENTRA CASI ESTACIONARIA. VIENTOS EN EXCESO DE 40 MPH Y GRANIZO DE MEDIA PULGADA SON POSIBLES CON ESTA TORMENTA. LLUVIAS TORRENCIALES OCURRE CON ESTA TORMENTA...Y RESULTARAN EN INUNDACIONES LOCALIZADAS. NO MANEJE SU VEHICULO A TRAVES DE CARRETERAS INUNDADAS. RELAMPAGOS FRECUENTES DE NUBA A SUELO ESTAN OCURRIENDO CON ESTA TORMENTA. LOS RAYOS PUEDEN CAER A 15 MILLAS DE LA TRONADA. BUSQUE REFUGIO SEGURO DENTRO DE UN VEHICULO O EDIFICIO. ER/CAM/ACP
The San Juan radar (TJUA), 78 km away, was scanning. The volume nearest the first event began at 19:42 UTC.
1 thunderstorm wind. Local standard time, as filed.
Downed trees at Guilarte sector blocking road 131.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2015Every state in 2015This day in weather historyWarnings in Puerto Rico, September 2015
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: 602892.