Ample low level moisture combined with strong daytime heating and local effects to produce numerous showers with thunderstorms across the Cordillera Central.
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.
Ample low level moisture combined with strong daytime heating and local effects to produce numerous showers with thunderstorms across the Cordillera Central.
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 May 27, 10:51 AM AST, 3 hours 54 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1051 AM AST FRI MAY 27 2011 .UPDATE...NO CHANGES NEEDED AT THIS TIME TO FORECAST GRIDS. STILL EXPECTED THE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS MAINLY ACROSS THE NORTHERN HALF OF PUERTO RICO. && .AVIATION...FROM 27/17Z TO 27/22Z... POSSIBLE AFTERNOON SHRA/ISOLD TSRA MAINLY ACROSS THE CORDILLERA CENTRAL AND NORTH SECTIONS OF PR. AFTERNOON CONVECTION MAY PRODUCE BRIEF MOUNTAIN TOP OBSCURATION WITH TEMPO MVFR/OR IFR CONDS NEAR TSTM. LATEST DOPPLER RADAR VELOCITY PROFILE AND SFC OBS SUGGEST OVERALL LIGHT AND VARIABLE LOW LEVEL WINDS CAN BE EXPECTED WITH GENERAL SW-W WND COMPONENT BLO 150K FT. && .PRELIMINARY POINT TEMPS/POPS... SJU 87 78 87 78 / 40 40 20 20 STT 86 78 87 78 / 20 20 20 20 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 71/64
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 512 AM AST FRI MAY 27 2011 AMZ710>745-PRZ001>013-280915- 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- 512 AM AST FRI MAY 27 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT DUE TO FAIRLY SATURATED SOILS...PROLONGED PERIODS OF MODERATE TO HEAVY RAINFALL WILL RESULT IN RAPID RISES IN SMALL STREAMS AND CREEKS...AND WILL TRIGGER MUDSLIDES IN AREAS OF STEEP TERRAIN. .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-VIZ001-002-280915- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 512 AM AST FRI MAY 27 2011 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.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
217 PM AST FRI MAY 27 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0213 PM HEAVY RAIN GURABO 18.26N 65.98W
05/27/2011 E0.00 INCH GURABO PR PUBLIC
ROAD IN FRONT OF CIUDAD JARDIN SECTOR WAS REPORTED
FLOODED AND IMPASSABLE.
&&
FCASTROThe San Juan radar (TJUA), 20 km away, was scanning. The volume nearest the first event began at 18:44 UTC.
5 debris flow, 4 flash flood, 2 flood, 1 heavy rain. Local standard time, as filed.
Road 1 between from Caguas to Cayey was reported impassable.
Road 763 At Barrio Borinquen in Caguas was reported flooded with a car stranded.
Degetau Avenue was reported flooded.
Roads at Urb. Turabo Heights were reported flooded.
A mudslide was reported at road 929, Barrio Quebrada near cockpit San Carlos in the municipality of Juncos.
Road 1 at Barrio Beatriz in Caguas was reported flooded and impassable.
A mudslide was reported at road 568, km 20.3 in Barrio Negro in the municipality of Corozal.
A landslide was reported at Palmarito sector, Parcela 189 in the municipality of Corozal.
A mudslide was reported at Los Martinez sector, Road 805 in the municipality of Corozal.
Coamo river was reported out of its banks at road 556.
Rio Cibuco at Barrio Fatima was reported out of its banks.
A landslide was reported at Los Rivera sector in the municipality of Corozal.
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, May 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: 294320, 317737, 294322, 294323, 294325, 317736, 294354, 294353, 294355, 316980, 317738, 294356.