The passage of a tropical wave across the local area, brought numerous showers and strong thunderstorms to several sections of Puerto Rico, and particularly along the northeast, in the municipality of Loiza. The thunderstorm winds downed many trees and power lines during the early afternoon.
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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.
The passage of a tropical wave across the local area, brought numerous showers and strong thunderstorms to several sections of Puerto Rico, and particularly along the northeast, in the municipality of Loiza. The thunderstorm winds downed many trees and power lines during the early afternoon. Some Loizan fisherman reported seen a waterspout near the Herrera bridge between the municipality of Loiza and Rio Grande. The north central section also experienced very strong thunderstorms with gusty winds mainly in the Arecibo region.
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 6, 10:39 AM AST, 2 hours 29 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1039 AM AST TUE JUL 6 2010 .DISCUSSION..TROPICAL WAVE AXIS ACROSS EASTERN HISPANIOLA WITH ACTIVE WEATHER TRAILING BEHIND IT. ISOLATED TSTMS HAVE PERSISTED OVER THE USVI DURING THE MORNING AS THE TAIL OF THE WAVE INTERACTS WITH WEAK TUTT TROUGH OVER EAST HISPANIOLA AND SOUTHWEST FLOW ALOFT PROVIDES SLIGHT VENTILATION. LARGE CLUSTER OF TSTMS JUST OFFSHORE SOUTHERN PUERTO RICO SHOULD MAKE LANDFALL SOMEWHERE NEAR PONCE AND TO AFFECT THE WEST INTERIOR AND WEST AND NORTHWEST SECTIONS OF PUERTO RICO LATER TODAY. INHERITED FORECAST GRIDS FOR THE AFTERNOON TIME PERIOD DO COVER EXPECTED ACTIVITY VERY WELL. NO NEED TO UPDATE AT THIS TIME. LATEST 12Z SJU SOUNDING SHOWING COLD AIR ADVECTION ALOFT WITH FAVORABLE INSTABILITY INDEXES FOR STRONG AFTERNOON CONVECTION AND THE POTENTIAL FOR SMALL HAIL AND GUSTY WINDS WITH TSTMS. && .AVIATION...PREVAILING MAINLY VFR CONDS EXPECTED ACROSS TJSJ TSIST TISX TCCM AND TKPK IN A LOW LEVEL SE FLOW 15-20 KTS. BRIEF IFR EXPECTED IN SCT PASSIG SHOWERS/ISOL TSTMS MANLY FROM TJSJ TO TIST/TISX THRU 21Z. NMRS TO SCT SHRA AND TSRA EXPECTED ACROSS CENTRAL-WESTERN INTERIOR PR AND ALONG WEST/NW FLANK OF ISLAND AS LARGE CLUSTER OF TSMS JUST SOUTH OF PR MAKES LANDFALL INLAND NEAR PONCE AND CONTINUES NW INTO TJMZ AND TJBQ. FREQUENT IFR CONDS POSSIBLE IN TSRA OR SHRA AT TJMZ AND TJBQ FROM 06/16Z-06/22Z. PREVAILING VFR CONDS EXPECTED AT ALL SITES AFTER 08/06Z. && .PREV DISCUSSION... /ISSUED 453 AM AST TUE JUL 6 2010/ SYNOPSIS...A TROPICAL WAVE ACROSS THE MONA PASSAGE THIS MORNING WILL CONTINUE TO TRACK WESTWARD AND AWAY FROM THE LOCAL ISLANDS TODAY AND TONIGHT. SURFACE HIGH PRESSURE WILL BUILD ACROSS THE NORTHEAST CARIBBEAN WEDNESDAY THROUGH FRIDAY MAINTAINING AN EAST SOUTHEAST LOW LEVEL WIND FLOW ACROSS THE REGION. DISCUSSION...THE DOPPLER WEATHER RADAR DETECTED SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS ACROSS THE SURROUNDING WATERS AND ACROSS SEVERAL PORTIONS OF PUERTO RICO OVERNIGHT AND EARLY THIS MORNING. LIMITED SHOWER ACTIVITY WAS DETECTED OVER THE U.S. VIRGIN ISLANDS SO FAR THIS MORNING. THE SHOWER AND THUNDERSTORM ACTIVITY WAS ASSOCIATED WITH A TROPICAL WAVE ACROSS THE REGION. THE WAVE AXIS WAS JUST ACROSS THE MONA PASSAGE EARLY THIS MORNING. DEEP TROPICAL MOISTURE IN A GENERALLY EAST SOUTHEASTERLY WIND FLOW BEHIND THIS WAVE...WILL CONTINUE TO BRING NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS SOME WITH VERY HEAVY RAINFALL...ACROSS MUCH OF THE INTERIOR AND NORTHERN PUERTO RICO...AS TRAILING MOISTURE WILL LINGER ACROSS THE ISLANDS TODAY. THE QUICK CELL MOTION...SHOULD PREVENT SIGNIFICANT OR WIDESPREAD FLASH FLOODING...BUT CERTAINLY EXPECT URBAN AND SMALL STREAM FLOODING AND PONDING OF WATER ON ROADWAYS TODAY AND POSSIBLE THIS EVENING. IN FACT...THE GFS FORECAST SOUNDING SUGGESTS THAT PWAT VALUES WILL CONTINUE WELL ABOVE 2.0 INCHES TODAY...DECREASING AGAIN BELOW 2.0 INCHES ON WEDNESDAY. AFTER THE PASSAGE OF THE WAVE...WEDNESDAY THROUGH FRIDAY...A DRIER AIR MASS AND A NEW ROUND OF SAHARAN DUST WILL ENCOMPASS AGAIN THE LOCAL ISLANDS. HOWEVER...AS HAS BEEN THE CASE LATELY...WE WILL STILL HAVE SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS EACH AFTERNOON ESPECIALLY ACROSS WESTERN AND INTERIOR SECTIONS OF PUERTO RICO. A TROPICAL WAVE WILL APPROACH TO THE REGION BY THE UPCOMING WEEKEND...INCREASING AGAIN THE CHANCES OF SHOWERS AND THUNDERSTORMS ACROSS THE LOCAL ISLANDS AVIATION...SHOWERS WILL CONTINUE TO DEVELOP BEHIND A TROPICAL WAVE CURRENTLY ACROSS THE MONA PASSAGE...STARTING OVER THE CORDILLERA CENTRAL LATE IN THE MORNING OR EARLY IN THE AFTERNOON...MOVING LATER ACROSS THE NORTHERN SECTIONS OF PUERTO RICO AND CONTINUING INTO THE EVENING HOURS. WINDS FROM THE EAST SOUTHEAST AT 10-20 KNOTS ARE EXPECTED ACROSS THE LOCAL TAF SITES TODAY. DECREASING SHOWER ACTIVITY IS EXPECTED LATE TONIGHT AND WEDNESDAY MARINE...EXPECT WINDS OF 12 TO 21 KNOTS AND SEAS OF 4 TO 7 FEET ACROSS THE REGIONAL WATERS THROUGH AT LEAST WEDNESDAY...AS THE TROPICAL WAVE MOVES AWAY FROM THE REGIONAL WATERS AND THE PRESSURE GRADIENT TIGHTENS ACROSS THE LOCAL WATERS BEHIND THE WAVE. SMALL BOAT OPERATORS SHOULD EXERCISE CAUTION ACROSS SEVERAL OF THE LOCAL COASTAL WATERS ZONES TODAY. SMALL CRAFT ADVISORIES WILL BE IN EFFECT THIS EVENING FOR THE OFFSHORE WATERS AND FOR THE MONA PASSAGE. PLEASE REFER TO SJUCWFSJU FOR THE FORECAST DETAILS. && .PRELIMINARY POINT TEMPS/POPS... SJU 90 78 91 80 / 70 30 20 10 STT 90 81 89 81 / 70 40 20 10 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 37/06
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 532 AM AST TUE JUL 6 2010 AMZ710>745-PRZ001>013-070945- 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- 532 AM AST TUE JUL 6 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS AND A FEW THUNDERSTORMS ARE EXPECTED TO CONTINUE TO MOVE ACROSS THE COASTAL WATERS OF PUERTO RICO THIS MORNING...WITH A FEW OF THESE MOVING INLAND ACROSS CULEBRA...VIEQUES AND THE EAST AND SOUTHEAST SECTION OF MAINLAND PUERTO RICO. NUMEROUS SHOWERS AND ISOLATED THUNDERSTORM WILL DEVELOP ACROSS THE CENTRAL SECTIONS OF MAINLAND PUERTO RICO THIS AFTERNOON. PERIODS OF HEAVY RAINFALL...BRIEF STRONG AND GUSTY WINDS...DANGEROUS LIGHTNING AND AT LEAST SOME URBAN AND SMALL STREAM FLOODING ARE LIKELY WITH SOME OF THESE STORMS. THE SHOWERS AND THUNDERSTORM WILL SHIFT SLOWING NORTHWARD THE AFTERNOON. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE AFTERNOONS ACROSS THE SECTIONS OF PUERTO RICO. EXPECT PERIODS OF LOCALLY HEAVY RAINFALL AND SOME URBAN AND SMALL STREAM FLOODING IN ISOLATED AREAS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. AMZ715-725-VIZ001-002-070945- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 532 AM AST TUE JUL 6 2010 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...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.
PRC013-027-065-071-115-061715-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
1239 PM AST TUE JUL 6 2010
THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A SPECIAL WEATHER
STATEMENT EFFECTIVE UNTIL 100 PM AST FOR PEOPLE IN THE FOLLOWING
MUNICIPALITIES
IN PUERTO RICO
ISABELA...QUEBRADILLAS...CAMUY...HATILLO AND ARECIBO
INCLUDING THE FOLLOWING LOCATIONS
ARECIBO...CAMUY...HATILLO...ISABELA AND QUEBRADILLAS
AT 1233 PM AST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
BAND OF STRONG THUNDERSTORMS ACROSS THE COASTAL MUNICIPALITIES
EXTENDING FROM ARECIBO TO ISABELA. STRONG GUSTY WINDS...FREQUENT
CLOUD TO GROUND LIGHTNING...SMALL HAIL AND HEAVY RAIN ARE
ANTICIPATED WITH THESE THUNDERSTORMS AS THEY MOVE OFFSHORE THROUGH
115 PM.
RMPRC013-027-065-071-115-061715-
COMUNICADO ESPECIAL SOBRE LAS CONDICIONES DEL TIEMPO SERVICIO
NACIONAL DE METEOROLOGIA SAN JUAN PR
1239 PM AST MARTES 6 DE JULIO DE 2010
EL SERVICIO NACIONAL DE METEOROLOGIA EN SAN JUAN HA EMITIDO UN
COMUNICADO ESPECIAL SOBRE LAS CONDICIONES DEL TIEMPO EN EFECTO HASTA
LAS 100 PM AST PARA LAS PERSONAS EN LOS SIGUIENTES MUNICIPIOS EN
PUERTO RICO
ISABELA...QUEBRADILLAS...CAMUY...HATILLO Y ARECIBO
INCLUYENDO LAS SIGUIENTES AREAS
ARECIBO...CAMUY...HATILLO...ISABELA Y QUEBRADILLAS
A LAS 12:33 PM AST...EL RADAR DOPPLER DEL SERVICIO NACIONAL DE
METEOROLOGIA INDICABA UNA BANDA DE FUERTES TRONADAS A TRAVES DE LOS
MUNICIPIOS COSTEROS DESDE ARECIBO HASTA ISABELA. FUERTES RAFAGAS DE
VIENTOS...RAYOS FREQUENTES DE NUBO AL SUELO...PEQUENO GRANIZO Y
LLUVIA FUERTE PUEDEN SER ANTICIPADAS CON ESTAS TRONADAS MIENTRAS SE
MUEVEN HACIA EL MAR HASTA LA 1:15 PM AST.
RM/KNThe San Juan radar (TJUA), 67 km away, was scanning. The volume nearest the first event began at 17:08 UTC.
3 thunderstorm wind. Local standard time, as filed.
A downed tree was reported on top of a power line at Los Muertos, Arrozales sector, in Barrio Sabana Hoyos of the Arecibo municipality.
Thunderstorm winds downed around twenty trees in the municipality of Loiza. Most of the damage was concentrated around road 188 and 187. A power pole fell on a car at the McDonalds restaurant along road 187.
Thunderstorm wind gusts downed nine trees and peeled off a galvanized zinc roof from a hay storage shed at Las Canelas neighborhood in Arecibo, close to the cemetery and PR52.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2010Every state in 2010This day in weather historyWarnings in Puerto Rico, July 2010
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: 252557, 252640, 252581.