An Upper level trough combined with daytime heating and local effects to produce scattered showers with isolated strong thunderstorms over the northwest 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.
An Upper level trough combined with daytime heating and local effects to produce scattered showers with isolated strong thunderstorms over the northwest 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 Jul 26, 11:22 AM AST, 2 hours 9 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1122 AM AST FRI JUL 26 2013 .UPDATE...MINOR UPDATES FOR AFTERNOON SHOWERS ESPECIALLY OVER COASTAL WATERS. && .DISCUSSION...THETA-E RIDGE PASSING OVER PUERTO RICO CURRENTLY AS EVIDENCED BY SCATTERED SHOWERS MAINLY OVER ATLANTIC AND CARIBBEAN WATERS OF EASTERN PR AND USVI...AND PRECIPITABLE WATER LOOP SHOWING 50 MM SAME LOCATION. SOME OF THESE HAVE COME ONSHORE AND PRODUCED A GUST TO 27 KT AT TJSJ. SUNSHINE IS GIVING IN TO INCREASING CLOUDS ACROSS THE ISLANDS AND CONVECTION COULD INITIATE VERY QUICKLY. BUT STILL EXPECT THE MOST CONVECTION OVER NORTHWEST PR THIS AFTERNOON. && .AVIATION...VFR XCP MVFR CIGS/VSBYS IN SCT SHRA/TSRA. MAY INCLUDE TEMPO PDS FOR TJMZ/TJBQ THIS AFT DEPENDING ON DEVELOPING CONVECTION. AREAS OBSCD MTNS THIS AFT. WINDS BLO FL150 ESE 15-20 KT THRU SAT. && .MARINE...CONTINUE WINDS/SEAS TO 19KT/5 FT THROUGH AT LEAST SAT. BUT LOOK FOR CONDITIONS TO DETERIATE BY SUNDAY EVENING TO EARLY MONDAY AS DORIAN APPROACHES. && .PREV DISCUSSION... /ISSUED 529 AM AST FRI JUL 26 2013/ SYNOPSIS...STRONG SURFACE HIGH ACROSS THE CENTRAL ATLANTIC WILL CONTINUE TO PROMOTE A MODERATE EASTERLY TRADES ACROSS THE REGION THROUGH MUCH OF THE WEEKEND. TUTT LOW NORTH OF THE AREA WILL REMAIN THE DOMINANT FEATURE THROUGH AT LEAST SATURDAY. THE TUTT IS FORECAST TO SHIFT FURTHER WEST OF THE AREA AND FILL BY SUNDAY AND INTO EARLY NEXT WEEK...IN RESPONSE TO UPPER LEVEL RIDGE WHICH WILL MOVE IN FROM THE EAST. AT 500 AM AST...0900 UTC...THE CENTER OF TROPICAL STORM DORIAN WAS LOCATED NEAR LATITUDE 17.1 NORTH... LONGITUDE 41.5 WEST. DORIAN IS MOVING TOWARD THE WEST NORTHWEST NEAR 20 MPH. A TURN TOWARD THE WEST AND AN INCREASE IN FORWARD SPEED ARE EXPECTED DURING THE NEXT COUPLE OF DAYS. MAXIMUM SUSTAINED WINDS ARE NEAR 50 MPH...WITH HIGHER GUSTS. TROPICAL STORM DORIAN IS STILL EXPECTED TO PASS NORTH OF THE LOCAL AREA LATE MONDAY. PLEASE REFER TO THE LATEST ADVISORIES ISSUED BY THE NATIONAL HURRICANE CENTER IN MIAMI FL. DISCUSSION...ALTHOUGH PREVIOUS TJSJ 26/00Z UPPER AIR SOUNDING ALONG WITH RECENT GROUND BASED GPS IPW AND BLENDED TPW SUGGEST PWAT VALUES BELOW 1.60 INCHES...EXPECT THE EASTERLY TRADES TO ADVECT SUFFICIENT LOW LEVEL MOISTURE ACROSS THE REGION TO COMBINE WITH LOCAL EFFECTS AND THE INFLUENCE OF THE UPPER LEVEL TROUGH... TO RESULT IN PERIODS OF CLOUDINESS WITH SHOWERS WITH ISOLATED THUNDERSTORMS ACROSS PARTS OF THE ISLANDS AND LOCAL WATERS. EXPECT EARLY MORNING PASSING SHOWERS ACROSS THE EAST COASTAL SECTIONS OF THE ISLANDS...FOLLOWED BY AFTERNOON CONVECTION WHICH WILL BE MAINLY FOCUSED ACROSS THE CORDILLERA CENTRAL AND NORTHERN SLOPES OF PUERTO RICO...INCLUDING PORTIONS OF THE SAN JUAN METRO AREA TODAY. SIMILAR CONDITIONS ARE EXPECTED ON SATURDAY. SOMEWHAT DRIER AIR MASS AND INCREASING SUBSIDENCE WILL MOVE OVER THE LOCAL AREA IN ADVANCE OF TROPICAL STORM DORIAN. THIS WILL RESULT IN A MOSTLY FAIR AND STABLE WEATHER PATTERN ACROSS THE REGION ON SUNDAY. HOWEVER BY LATE SUNDAY NIGHT AND INTO EARLY NEXT WEEK...WEATHER CONDITIONS MAY CHANGE AS TROPICAL STORM DORIAN APPROACHES THE NORTHEAST CARIBBEAN. BASED ON THE PRESENT FORECAST TRACK...TROPICAL STORM DORIAN SHOULD BEGIN TO AFFECT THE U.S. VIRGIN ISLANDS AND PUERTO RICO LATE SUNDAY THROUGH MONDAY. THIS WILL RESULT IN INCREASED POTENTIAL FOR LOCALLY HEAVY RAINFALL ACROSS THE REGION. HOWEVER...THERE STILL REMAINS UNCERTAINTY AS TO HOW FAR TO THE NORTH IT WILL PASS...AND WILL HAVE TO CLOSELY MONITOR HOW THINGS UNFOLD DURING THE NEXT 24-36 HOURS...AND MAKE ADJUSTMENTS TO THE LOCAL FORECAST WHEN DEEMED NECESSARY. AVIATION...VFR CONDITIONS EXPECTED ACROSS THE LOCAL TERMINALS OVERNIGHT AND MORNING. SHRA/TSRA DEVELOPMENT MAY AFFECT THE VICINITY OF TJSJ AND TJMZ AFTER 26/16Z. TJBQ WILL LIKELY OBSERVE TSRA AFTER 26/16Z...CAUSING MVFR OR EVEN IFR CONDITIONS. MTN OBSCURATIONS ARE TO BE EXPECTED AS CLOUDINESS INCREASES THROUGH THE DAY. EASTERLY WINDS WILL BE AROUND 10-15 KNOTS AND GUSTY WITH SEA BREEZE VARIATIONS. MARINE...SEAS UP TO 5 FEET AND WINDS 19 KNOTS OR LESS TODAY THROUGH AT LEAST SATURDAY. AS TROPICAL STORM DORIAN APPROACHES THE NORTHEAST CARIBBEAN AND BASED ON THE PRESENT FORECAST TRACK...EXPECT MARINE CONDITIONS TO GRADUALLY DETERIORATE WITH INCREASING WINDS AND BUILDING SEAS FORECAST ACROSS THE LOCAL WATERS AND ALL PASSAGES. PLEASE CONTINUE TO MONITOR AND CONSULT THE LATEST MARINE GUIDANCE AND TROPICAL STORM ADVISORIES ISSUED BY THE WFO SAN JUAN AND THE NATIONAL HURRICANE CENTER CONCERNING THE POSSIBLE EFFECTS OF TROPICAL STORM DORIAN OVER THE UPCOMING WEEKEND. && .PRELIMINARY POINT TEMPS/POPS... SJU 89 77 87 78 / 30 20 30 10 STT 89 79 89 79 / 30 30 20 10 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 54/23
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 615 AM AST FRI JUL 26 2013 AMZ710>745-PRZ001>013-271015- 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- 615 AM AST FRI JUL 26 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS AND A STRONG THUNDERSTORM OR TWO IS EXPECTED TO DEVELOP THIS AFTERNOON...MAINLY ACROSS INTERIOR...WEST SECTIONS OF PUERTO RICO. LOCALLY HEAVY RAINFALL WITH GUSTY WINDS AND POSSIBLE LIGHTNING IS EXPECTED. .DAYS TWO THROUGH THREE...SATURDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. HOWEVER...TROPICAL STORM DORIAN MAY APPROACH THE REGION LATE SUNDAY NIGHT. .DAYS FOUR THROUGH SEVEN...MONDAY THROUGH THURSDAY TROPICAL STORM DORIAN MAY MOVE ACROSS THE REGION STARTING LATE SUNDAY NIGHT THROUGH LATE MONDAY NIGHT. HEAVY RAINFALL...GUSTY WINDS...AND OCCASIONAL LIGHTNING WILL REMAIN POSSIBLE AS DORIAN'S RAINBANDS MOVE OVER THE AREA. HAZARDOUS SEAS IS ALSO POSSIBLE...DUE TO INCREASING SEAS AND WINDS...AND ENHANCED CONVECTION MAINLY OVER THE ATLANTIC AND NORTH COASTAL WATERS. FOR MORE INFORMATION...CONSULT THE LATEST GUIDANCE AND INFORMATION FROM THE NATIONAL HURRICANE CENTER CONCERNING THE POSSIBLE EFFECTS OF TROPICAL STORM DORIAN. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-271015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 615 AM AST FRI JUL 26 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 THREE...SATURDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. HOWEVER...TROPICAL STORM DORIAN MAY APPROACH THE REGION LATE SUNDAY NIGHT. .DAYS FOUR THROUGH SEVEN...MONDAY THROUGH THURSDAY TROPICAL STORM DORIAN MAY MOVE ACROSS THE REGION STARTING LATE SUNDAY NIGHT THROUGH LATE MONDAY NIGHT. HEAVY RAINFALL...GUSTY WINDS...AND OCCASIONAL LIGHTNING WILL REMAIN POSSIBLE AS DORIAN'S RAINBANDS MOVE OVER THE AREA. HAZARDOUS SEAS IS ALSO POSSIBLE...DUE TO INCREASING SEAS AND WINDS...AND ENHANCED CONVECTION MAINLY OVER THE ATLANTIC AND NORTH COASTAL WATERS. FOR MORE INFORMATION...CONSULT THE LATEST GUIDANCE AND INFORMATION FROM THE NATIONAL HURRICANE CENTER CONCERNING THE POSSIBLE EFFECTS OF TROPICAL STORM DORIAN. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The San Juan radar (TJUA), 116 km away, was scanning. The volume nearest the first event began at 17:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
Power lines were reported downed along PR-110 and PR-125. Two houses had their roofs blown off. Barrio Trocha, Lasalle sector.
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, July 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: 470262.