Upper level trough over the Mona Passage combined with low level moisture and local effects produced scattered to numerous showers with isolated strong thunderstorms over some areas of Puerto Rico.
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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.
Upper level trough over the Mona Passage combined with low level moisture and local effects produced scattered to numerous showers with isolated strong thunderstorms over some areas 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 Aug 23, 2:34 PM AST, 16 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 234 PM AST FRI AUG 23 2013 .SYNOPSIS...UPPER LOW OVER THE MONA CHANNEL WILL RETROGRESS TOWARD HISPANIOLA OVER THE WEEKEND. SUBTROPICAL RIDGE WILL BUILD OVER THE NORTHEAST CARIBBEAN SAT AND HOLD THROUGH MUCH OF NEXT WEEK. && .DISCUSSION...SHOWERS AND THUNDERSTORMS OVR PR WILL DISSIPATE BY THIS EVENING WITH MUCH DRIER AND STABLE AIR MASS (SAL) MOVING IN FOR THE WEEKEND. NEXT TROPICAL WAVE IS FCST TO MOVE ACROSS THE AREA MON AFTERNOON AND TUE AND WILL BRING EXTENSIVE CLOUDS WITH NUMEROUS SHOWERS AND THUNDERSTORMS. HOWEVER...THE BEST MOISTURE WILL STAY SOUTH OVR THE CARIBBEAN SEA. SO DON'T THINK THIS WAVE POSES ANY SERIOUS THREAT OF FLOODING. CONDITIONS IMPROVE SOMEWHAT MIDDLE OF NEXT WEEK BUT STILL WITH TYPICAL AFTERNOON CONVECTION OVER WESTERN PR. && .AVIATION...SHRA/TSRA OVR PR HAVE GENERATED MVFR/IFR CONDS WITH MTN OBSCURATIONS AND WILL IMPROVE AFT 23/22Z. EXPECT VFR CONDS PR AFT 24/02Z. A BAND OF MOISTURE MOVING IN FROM THE SE WILL BRING BRIEF MVFR IN SCT LOCATIONS IN THE LEEWARD AND U.S. VIRGIN ISLANDS BEGG 24/02Z AT TKPK...TNCM AND 24/06-08Z AT TISX...TIST. CONDS IMPROVING AFT 24/12Z. LLVL WINDS E 10-20 KTS INCRG AFT 24/06Z TO 15-25 KTS JUST ABV THE SFC TO 15 KFT. && .MARINE...SEAS 3-5 FT AND WINDS UP TO 20 KT. SCT TSRA OVER MONA CHANNEL THE MAIN THREAT THROUGH THIS EVENING. TROPICAL WAVE TO MOVE ACROSS THE AREA MON AFTERNOON-MON NIGHT WITH AN INCREASE IN SHOWERS. && .PRELIMINARY POINT TEMPS/POPS... SJU 78 91 79 90 / 10 10 10 10 STT 80 90 81 90 / 10 10 10 10 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 12/64
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 531 AM AST FRI AUG 23 2013 AMZ710>745-PRZ001>013-240945- 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- 531 AM AST FRI AUG 23 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-240945- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 531 AM AST FRI AUG 23 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 AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY 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 202 PM AST FRI AUG 23 2013 PRC003-005-011-065-081-083-099-117-131-141-231900- ANASCO PR-HATILLO PR-LARES PR-MOCA PR-UTUADO PR-SAN SEBASTIAN PR- LAS MARIAS PR-RINCON PR-AGUADILLA PR-AGUADA PR- 202 PM AST FRI AUG 23 2013 AT 153 PM AST...NATIONAL WEATHER SERVICE METEOROLOGIST DETECTED STRONG THUNDERSTORMS 2 MILES SOUTHWEST OF AGUADA...IN MOCA AND UTUADO...MOVING WEST NORTHWEST AT 20 MPH. SMALL HAIL WAS ALSO DETECTED BY THE DUAL-POL RADAR. THIS SYSTEM SHOULD DISSIPATE BY 3 PM AST. INTENSE LIGHTNING IS REPORTED WITH THIS STORM. IF OUTDOORS...STAY WAY 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. SNELL
COMUNICADO ESPECIAL SOBRE LAS CONDICIONES DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 202 PM AST JUEVES 22 DE AGOSTO DE 2013 PRC003-005-011-065-081-083-099-117-131-141-231900- ANASCO PR-HATILLO PR-LARES PR-MOCA PR-UTUADO PR-SAN SEBASTIAN PR- LAS MARIAS PR-RINCON PR-AGUADILLA PR-AGUADA PR- 202 PM AST JUEVES 22 DE AGOSTO DE 2013 A LAS 1:53 PM AST...METEOROLOGOS DEL SERVICION NACIONAL DE METEOROLOGIA DETECTARON FUERTES TRONADAS A 2 MILLAS AL SUROESTE DE AGUADA...MOCA Y UTUADO...MOVIENDOSE HACIA EL OESTE NOROESTE A 20 MPH. GRANIZO PEQUENO FUE DETECTADO POR EL RADAR DOPPLER. ESTE SISTEMA DEBE DISIPARSE CERCA DE LAS 3 PM AST. RELAMPAGOS INTENSOS SE REPORTAN CON ESTA TRONADA. SI ESTA EN EL EXTERIOR...MANTENGASE ALEJADO DE OBJETOS AILADOS COMO ARBOLES. MUEVASE AL INTERIOR SI ES POSIBLE. CUANDO ESTE EN EL INTERIOR...MANTENGASE ALEJADO DE VENTANAS Y PUERTAS Y EVITE USAR TELEFONOS A MENOS QUE SEA UNA EMERGENCIA.
The San Juan radar (TJUA), 96 km away, was scanning. The volume nearest the first event began at 18:49 UTC.
1 hail, 1 heavy rain. Local standard time, as filed.
Pea size hail was reported in downtown Las Marias. In addition, fallen trees and downed power lines were also reported in Las Maravillas Este sector.
A mudslide was reported at road PR-175 in Barrio Carraizo.
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: 475605, 475606.