An upper level trough combined with daytime heating and local topographic effects to produce showers and thunderstorms across north central 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.
An upper level trough combined with daytime heating and local topographic effects to produce showers and thunderstorms across north central 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 Jun 28, 2:27 PM AST, 1 hour 48 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 227 PM AST MON JUN 28 2010 .SYNOPSIS...AN UPPER LEVEL LOW...JUST NORTHWEST OF PUERTO RICO THIS AFTERNOON...IS EXPECTED TO LIFT NORTHWEST AND AWAY FROM THE LOCAL ISLANDS TONIGHT AND TOMORROW. AN ASSOCIATED SURFACE REFLECTION WILL CONTINUE TO MOVE ACROSS THE REGION UNTIL AT LEAST TOMORROW. A MID TO UPPER LEVEL RIDGE WILL EXTEND ACROSS THE FA DURING THE DURING THE NEXT FEW DAYS BEHIND THE DEPARTURE TUTT. && .DISCUSSION...AN UPPER LEVEL TUTT LOW...JUST TO THE NORTHWEST OF PUERTO RICO THIS AFTERNOON...WILL CONTINUE TO LIFT TO THE NORTHWEST AND AWAY FROM THE LOCAL ISLANDS TONIGHT AND TOMORROW. WHILE THIS HAPPENS...A SERIES OF ASSOCIATED SURFACE REFLECTIONS...WILL CONTINUE TO DRAG ACROSS THE LOCAL ISLANDS UNTIL AT LEAST TOMORROW. THIS MOISTURE COMBINED WITH GOOD HEATING...LOCAL SEA BREEZE CONVERGENCE...OROGRAPHIC LIFTING AND LEFTOVER FAVORABLE UPPER LEVEL WIND CONDITIONS FROM THE DEPARTING TUTT LOW...PRODUCED SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS ALONG THE CORDILLERA CENTRAL...MOVING LATER NORTHWARD ACROSS THE NORTHERN MUNICIPALITIES OF PUERTO RICO. SEVERAL FLOOD ADVISORIES WERE ISSUED FOR MUNICIPALITIES ALONG THE NORTHERN HALF OF THE ISLAND. THIS ACTIVITY WILL LINGER ACROSS THE REGION UNTIL THE EARLY EVENING HOURS. THE GFS FORECAST SOUNDING MAINTAINS PWAT VALUES ABOVE 2.0 INCHES UNTIL TONIGHT DECREASING RAPIDLY TOMORROW AND FOR THE NEXT SEVERAL DAYS. THUS...A SLIGHTLY DRIER AIR MASS IS EXPECTED TO ADVECT ACROSS THE REGION FROM THE EAST BY THE MIDDLE OF THE WEEK...PRODUCING A DRYING TREND ACROSS THE LOCAL ISLANDS. HOWEVER...THERE STILL SHOULD BE ENOUGH AVAILABLE MOISTURE EACH DAY...TO RESULT IN SOME LOCALIZED CLOUDINESS AND DIURNALLY INDUCED SHOWERS AND THUNDERSTORMS OVER PARTS OF THE LOCAL ISLANDS EACH AFTERNOON. A WEAK TROPICAL WAVE WILL PASS SOUTH OF THE REGION THURSDAY AND FRIDAY...WITH MINIMAL INFLUENCES OVER THE LOCAL ISLANDS. THE NEXT SIGNIFICANT TROPICAL WAVE WILL APPROACH TO THE FA EARLY DURING THE UPCOMING WEEK...BRINGING AGAIN A GENERAL INCREASE IN CLOUDINESS...SHOWERS AND THUNDERSTORMS ACROSS THE LOCAL ISLANDS. && .AVIATION...TEMPORARY MVFR CONDS WILL REMAIN POSSIBLE ACROSS TJMZ...TJBQ AND TJSJ THROUGH 28/23Z...WITH BRIEF IFR CONDS POSSIBLE ACROSS TJSJ AND TJBQ IN A PASSING +TSRA OR +SHRA. AFT 28/23Z... PREVAILING VFR CONDS EXPECTED ALL TAF SITES IN A LLVL ESE WIND FLOW OF 10 TO 15 KTS. LIGHT VA EMISSIONS FROM MONTSERRAT EXPECTED TO REMAIN SOUTH OF TKPK AND TISX OVERNIGHT. && .PRELIMINARY POINT TEMPS/POPS... SJU 79 91 78 89 / 40 40 40 30 STT 80 89 80 89 / 30 30 50 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 04/72
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN...CORRECTED ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 559 AM AST MON JUN 28 2010 AMZ710>745-PRZ001>013-291000- 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- 559 AM AST MON JUN 28 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON ACROSS THE INTERIOR...WEST AND NORTHWEST SECTIONS OF PUERTO RICO. EXPECT PERIODS OF HEAVY RAINFALL AND SOME URBAN AND SMALL STREAM FLOODING IN A FEW LOCATIONS...WITH THE POTENTIAL FOR SOME LOCALIZED FLASH AND RIVER FLOODING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-291000- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 559 AM AST MON JUN 28 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED ACROSS THE LOCAL ISLANDS FROM TIME TO TIME. THESE SHOWERS WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY RAIN...THEREFORE URBAN AND SMALL STREAM FLOODING WILL ALSO BE LIKELY IN ISOLATED AREAS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The San Juan radar (TJUA), 52 km away, was scanning. The volume nearest the first event began at 20:13 UTC.
1 flash flood. Local standard time, as filed.
River Rio Cibuco was reported overflowing in the Bajuras sector, at the intersection of roads 676 and 690 with Highway 2. Roads 620 and 647 were also reported flooded.
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, June 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: 247716.