Broad low pressure across the southwest Caribbean Sea produced a south to southwest wind transporting ample moisture across the local area. This led to periods of heavy rainfall across the region.
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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.
Broad low pressure across the southwest Caribbean Sea produced a south to southwest wind transporting ample moisture across the local area. This led to periods of heavy rainfall across the 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 Jun 4, 10:21 AM AST, 3 hours 24 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1021 AM AST SAT JUN 4 2011 .UPDATE...ESSENTIALLY NO CHANGES NEEDED TO CURRENT FORECASTS BUT WILL UPDATE THEIR WORDING. && .DISCUSSION...LIGHT/MODERATE SHOWERS ACROSS PR ENDED THIS MORNING AND SKIES ARE CLEARING. CUMULUS HAS ALREADY DEVELOPED OVER THE CENTRAL AND NORTH CENTRAL INTERIOR OF PR...QUICKLY FOLLOWING THE LINE OF CLEARING. NO RAIN SHOWING UP ON RADAR YET BUT EXPECT THAT TO BEGIN AT LEAST BY NOON... AS FORECAST CURRENTLY STATES. THERE IS PLENTY OF MOISTURE (2.29 INCHES) ON SJU RAOB AND THE LOW LEVEL DRY LAYER IS ALMOST GONE. HOWEVER MODELS SHOW A LOW LEVEL RIDGE THAT WILL PASS OVER THE ISLAND BY LATE AFTERNOON/EVENING THAT WOULD SERVE TO USHER IN THE SLIGHTLY DRIER AIR LURKING SOUTH OF PR AND HELP SUPPRESS CONVECTION BY THEN. SJU VAD WIND PROFILE SHOWS WINDS AT AND BELOW 5 KFT HAVE TURNED SOUTH ALBEIT WEAK BUT IT CONFIRMS THE RIDGE IS APPROACHING. UPPER LEVEL DIVERGENCE UNTIL THEN IS NOT STRONG AS IT MAY BE BY MON. && .AVIATION...MOUNTAIN OBSCURATIONS AS WELL AS MVFR/IFR CONDITIONS ARE LIKELY ACROSS THE INTERIOR AND WESTERN PORTIONS OF PUERTO RICO ANYTIME THIS AFTERNOON...POSSIBLY INCLUDING TJBQ/TJMZ/TJSJ IN SHRA AND TSRA. CONVECTION THIS AFTERNOON AND TONIGHT WILL BE LESS WIDESPREAD AT TJPS/TIST AND DECREASES TO ISOLD AT TISX. WINDS EXPECTED TO BE LIGHT AND VARIABLE FROM THE SFC TO 12 KFT...MAINLY FROM SOUTH TO SOUTHWEST. && .PREV DISCUSSION... /ISSUED 507 AM AST SAT JUN 4 2011/ SYNOPSIS...BROAD LOW PRESSURE ACROSS THE SOUTHWEST CARIBBEAN SEA WILL LINGER ACROSS THIS AREA DURING THE NEXT FEW DAYS. A SOUTH TO SOUTHWEST WIND WILL TRANSPORT AMPLE MOISTURE ACROSS THE NORTHEAST CARIBBEAN. DISCUSSION...LIGHT TO MODERATED RAIN HAS BEEN AFFECTING THE WESTERN PART OF PUERTO RICO OVERNIGHT. OTHER SHOWERS WERE NOTED OVER THE U.S. VIRGIN ISLANDS...MAINLY OVER SAINT THOMAS AND SAINT JOHN. THIS ACTIVITY IS EXPECTED TO CONTINUE THROUGHOUT THE MORNING HOURS. THE BIG QUESTION IS...WHEN THIS WET WEATHER PATTERN WILL END. UNFORTUNATELY...IS NOT GOING TO BE ANYTIME SOON. IN FACT...THINGS ARE SLOWLY BECOMING MORE FAVORABLE FOR VERY ACTIVE WEATHER ACROSS THE NORTHEAST CARIBBEAN. A VERY COMPLEX WEATHER SCENARIO IS IN STORE FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS. AN AREA OF LOW PRESSURE CURRENTLY ACROSS THE WESTERN CARIBBEAN SEA...IS EXPECTED TO LINGER IN THIS POSITION FOR THE NEXT 72 HOURS...AN IS EXPECTED TO SLOWLY BECOMES BETTER DEFINED. AS THIS SYSTEM DEVELOPS...A VERY MOIST AND UNSTABLE ATMOSPHERE WILL TAKE PLACE ALSO ACROSS THE LOCAL AREA...AS ANOTHER AREA OF LOW PRESSURE WILL TRY TO DEVELOP OVER OR NORTHEAST OF THE LOCAL AREA. IS NOT CLEAR YET...IF A NEW LOW PRESSURE WILL FORM...OR WILL BE AN AMPLIFICATION OF THE AFOREMENTIONED LOW IN THE WESTERN CARIBBEAN SEA. IN ANY CASE...A VERY WET SCENARIO...IS BECOMING MORE LIKELY TO OCCUR MAINLY MONDAY INTO TUESDAY...WHEN ALL INGREDIENTS WILL BE IN PLACE FOR A GOOD DEAL OF NUMEROUS TO WIDESPREAD SHOWER ACTIVITY ACROSS THE REGION. SURPRISINGLY...COMPUTER MODELS AGREED IN THIS SCENARIO...AND IN THE TIMING OF THE EVENT. PW VALUES ARE EXPECT TO RISE AS HIGH AS 2.5 INCHES BY MONDAY INTO TUESDAY...WITH THETA-E VALUES RISING FROM 325K TO NEAR 343K BY MONDAY NIGHT. THESE FACTORS...IN COMBINATION WITH AN INCREASE IN SOUTH TO SOUTHWEST WINDS...BETWEEN 20-25KT AT THE SURFACE...PROMISE TO BRING VERY ACTIVE WEATHER ACROSS THE LOCAL AREA. HISTORICALLY...THIS WEATHER SCENARIO HAS CREATED FLOODING PROBLEMS ACROSS THE LOCAL AREA. DUE TO PREVIOUS RAINFALL... SOILS ACROSS PUERTO RICO...BUT MAINLY OVER THE NORTHERN HALF...ARE VERY SATURATED. ADDITIONAL RAINFALL ONLY WILL AGGRAVATED THE MUDSLIDES IN AREAS OF STEEP TERRAIN...AND RIVERS WILL REACT QUICKLY TO NEW RAINFALL ACCUMULATIONS. PEOPLE ARE URGED TO STAY TUNED FOR LATEST ADVISORIES...WATCHES...OR WARNINGS WHICH CAN BE ISSUE DURING THE WEEKEND AND BEYOND...AS THIS SITUATION DEVELOPS DURING THE NEXT DAYS. AVIATION....VCSH WILL REMAIN POSSIBLE IN AND AROUND ALL PR AND VI TAF SITES IN THE MORNING MAINLY OVER THE TERMINAL OF TJBQ AND TJMZ. AFT 04/16Z...LOCAL MOUNTAIN OBSCURATIONS AS WELL AS MVFR/IFR CONDITIONS ARE POSSIBLE ACROSS THE INTERIOR AND WESTERN PORTIONS OF PUERTO RICO...INCLUDING TJBQ/TJMZ AND POSSIBLY TJSJ IN SHRA AND TSRA. WINDS ARE EXPECTED TO BE LIGHT AND VARIABLE FROM THE SFC TO 15 KFT. HYDROLOGY...REFER TO ESFSJU (HYDROLOGIC OUTLOOK) PRODUCT FOR IMPORTANT INFORMATION REGARDING THE POTENTIAL OF HEAVY RAINFALL AND THE RISK FOR SIGNIFCANT FLOODING. && .PRELIMINARY POINT TEMPS/POPS... SJU 86 75 85 76 / 70 60 60 30 STT 86 76 87 75 / 50 40 50 50 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 54/11
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 507 AM AST SAT JUN 4 2011 AMZ710>745-PRZ001>013-050915- 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- 507 AM AST SAT JUN 4 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT AVAILABLE MOISTURE WILL COMBINE WITH DAYTIME HEATING AND LOCAL EFFECTS... WHICH WILL RESULT IN AFTERNOON CONVECTION OVER PUERTO RICO. DUE TO FAIRLY SATURATED SOILS... PROLONGED PERIODS OF MODERATE TO HEAVY RAINFALL...THIS WILL RESULT IN URBAN FLOODING...RAPID RISES IN SMALL STREAMS AND CREEKS...AND MAY TRIGGER MUDSLIDES IN AREAS OF STEEP TERRAIN AS WELL AS POSSIBLE RIVER FLOODING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A LOW PRESSURE IS FORECAST TO TRACK EASTWARD NORTH OF PUERTO RICO OVER THE WEEKEND...THIS WEATHER FEATURE WILL DRAG A LOW LEVEL CONVERGENCE BOUNDARY ACROSS PUERTO RICO AND HELP SUSTAIN PERIODS OF HEAVY RAINFALL IN THE SUNDAY TO TUESDAY TIME FRAME. SIGNIFICANT RAINFALL AMOUNTS THAT COULD LEAD TO FLASH FLOODING OF SMALL STREAMS AND LARGER RIVERS APPEARS POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-050915- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 507 AM AST SAT JUN 4 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS THE U.S. VIRGIN ISLANDS AS AN AREA OF CONVECTIVE WEATHER APPROACHES THE LOCAL ISLANDS. THERE IS A SLIGHT CHANCE OF LOCALLY HEAVY RAIN WHICH MAY CAUSE URBAN FLOODING ACROSS THE ISLANDS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A LOW PRESSURE IS FORECAST TO TRACK EASTWARD NORTH OF THE LOCAL ISLANDS OVER THE WEEKEND...THIS FEATURE WILL DRAG A LOW LEVEL CONVERGENCE BOUNDARY ACROSS REGION AND HELP SUSTAIN PERIODS OF HEAVY RAINFALL IN THE SUNDAY TO TUESDAY TIME FRAME. SIGNIFICANT RAINFALL AMOUNTS THAT COULD LEAD TO FLASH FLOODING OF SMALL STREAMS AND LARGER RIVERS APPEARS POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The San Juan radar (TJUA), 17 km away, was scanning. The volume nearest the first event began at 17:46 UTC.
2 flash flood, 1 flood, 1 debris flow. Local standard time, as filed.
Road 174 was impassable due to a river out of its banks at Sector La Charca.
Landslides occured at Road 140 at Barrio Mameyes, La Jungla sector. Other landslides were reported at Road 111 km 1.1, and Road 123.
Rio Manati was reported out of its banks at Highway 2 between the municipalities of Barceloneta and Manati.
Rio Grande de Manati was out of its banks at highway 2 between km 0.5 and at the border between the municipalities of Barceloneta and Manati.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2011Every state in 2011This day in weather historyWarnings in Puerto Rico, June 2011
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: 328323, 328192, 328403, 328399.