Showers and thunderstorms, some with very heavy rain affected the municipalities of the north central sections from Arecibo eastward to Toa Baja. More than 400 families in Vega Alta and Dorado municipalities were impacted by the floods.
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.
Showers and thunderstorms, some with very heavy rain affected the municipalities of the north central sections from Arecibo eastward to Toa Baja. More than 400 families in Vega Alta and Dorado municipalities were impacted by the floods. The governor of Puerto Rico declared at State of Emergency for the municipalities of Vega Alta, Manati, Dorado, Toa Baja, and Arecibo along the north central part of the island due to the cumulative effect of the rains of 29-31 May. River La Plata/Naranjito USGS rainfal sensor recorded rainfall amounts of 6.14 inches during this period. Numerous flooded roads were and homes were reported. Dorado municipality roads PR 693, PR 2 at Jacana sector, Golden Hills sector, PR 694 at Barrio Maguayo, PR 697 at Barrio Costa de Oro, PR 659 at Barrio Santa Rosa, PR 695 at Barrio Puertos and Kennedy Street in Barrio Mameyal were reported impassable.
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 31, 4:27 PM AST, 1 hour 5 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE SAN JUAN PR 427 PM AST MON MAY 31 2010 UPDATED TO ADD CLIMATE SECTION. .SYNOPSIS...AT UPPER LEVELS...HIGH PRESSURE NOSING INTO THE CARIBBEAN FROM THE EAST WILL MOVE INTO THE CENTRAL AND WESTERN CARIBBEAN TOMORROW AND WEDNESDAY AND REMAIN LITTLE CHANGED UNTIL A TROUGH DIGS IN OVER HISPANIOLA SUNDAY NIGHT AND PERHAPS FORMS A CUT-OFF LOW JUST NORTHWEST OF PUERTO RICO ON TUESDAY OF NEXT WEEK. AT MID LEVELS...HIGH PRESSURE NOSING INTO THE CARIBBEAN FROM THE EAST WILL MOVE INTO THE CENTRAL AND WESTERN CARIBBEAN TOMORROW AND WEDNESDAY. HIGHER PRESSURE WILL FORM OVER THE CENTRAL ATLANTIC MID WEEK NEXT WEEK. MID LAYERS WILL DRY ON WEDNESDAY AND REMAIN QUITE DRY UNTIL SUNDAY. AT LOWER LEVELS...A ZONE OF CONVERGENCE HAS FORMED JUST NORTH OF 20 NORTH AND CLOUD COVER FROM THIS BAND HAS EXPANDED TO COVER MOST OF PUERTO RICO AND THE U.S. VIRGIN ISLANDS. THE BAND IS EXPECTED TO LIFT NORTH AS HIGHER PRESSURE WITH DRY AIR MOVES INTO THE CARIBBEAN TUESDAY AND WEDNESDAY. SOME MOISTURE RETURNS AFTER SATURDAY. && .DISCUSSION...THE PRESENCE OF A ZONE OF CONVERGENCE TO THE NORTH AND THE EXTENSIVE CLOUD COVER AT MID LEVELS THAT IT HAS BROUGHT HAS DIMINISHED AND RETARDED CONVECTIVE ACTIVITY OVER NORTHERN PUERTO RICO. SOME SHOWERS HAVE FORMED FROM SAN JUAN TO AGUADA...BUT AMOUNTS HAVE BEEN LESS THAN ONE HALF INCH. THIS IS NOT ENOUGH TO WARRANT A FLASH FLOOD WATCH AND HAVE DECIDED TO CANCEL IT WITH THE ZONE PACKAGE ISSUANCE. WOULD HAVE CANCELED IT SOONER...BUT EVEN MODEST SHOWER ACTIVITY COULD HAVE TRIGGERED A MUDSLIDE IN VERY SATURATED SOILS AND SO HELD OFF UNTIL A BETTER IDEA COULD BE GAINED AS TO THE AMOUNT OF CONVECTION THAT COULD FORM. SHOWERS HAVE FORMED OVER THE CARIBBEAN SEA SOUTH AND SOUTHWEST OF THE U.S. VIRGIN ISLANDS AND IN THE CENTER OF THE MONA CHANNEL AS WELL AS NORTH IN THE ZONE OF CONVERGENCE MENTIONED ABOVE...BUT NOTHING SIMILAR TO THE NORTHEAST SOUTHWEST BAND OF SHOWERS DEPICTED BY THE NAM OVER CENTRAL PUERTO RICO MOVING TO THE NORTHWEST DURING THE AFTERNOON. THEREFORE HAVE DISCARDED THE NAM FOR POOR INITIALIZATION. THE GFS SHOWS BETTER CONVECTION NORTH OF THE AREA BUT ALSO HAD TOO MUCH MOISTURE OVER PUERTO RICO AND THE U.S. VIRGIN ISLANDS. SOUTHEAST FLOW AT 850 MB CONTINUES THROUGH FRIDAY AND...AS SOON AS CLOUDS CLEAR...MAXIMUM TEMPERATURES WILL BE BUSTING THROUGH THE 90 DEGREE MARK IN THE SAN JUAN METROPOLITAN AREA AS THEY HAVE MANY DAYS IN MAYAGUEZ AND IN PONCE. EXPECT CONSIDERABLY WARMER WEATHER IN SAN JUAN TOMORROW AND WEDNESDAY. MODELS SHOW THE DRY PERIOD BEGINNING IN EARNEST WEDNESDAY AND THURSDAY AND THEN MOISTURE SLOWLY CREEPS BACK. GOOD MOISTURE MAY RETURN THE FIRST FULL WEEK OF JUNE BUT THE WETTEST WEATHER IS NOW LIKELY BEHIND US FOR MANY DAYS TO COME. NEVERTHELESS...TOTAL PRECIPITABLE WATER WILL BE ABOVE 1.5 INCHES FOR THE MAJORITY OF THE NEXT 10 DAYS AND SOME CONVECTION IS ALMOST GUARANTEED IN WESTERN OR NORTHWESTERN PUERTO RICO EACH AFTERNOON...WITH ISOLATED SHOWERS POSSIBLE ELSEWHERE INCLUDING THE U.S. VIRGIN ISLANDS. THE BEST NEWS YET IS THAT SUNNIER WEATHER SHOULD BE SEEN WEDNESDAY AND THURSDAY EVERYWHERE IN THE FORECAST AREA. SAHARAN DUST IS QUITE VISIBLE IN SATELLITE IMAGERY AND MAY AFFECT THE AREA IN A FEW DAYS...BUT BY THE TIME IT ARRIVES EXPECT IT TO BE BETTER DISPERSED WITH THE MOST DENSE AREA SOUTH OF THE LOCAL ISLANDS. && .AVIATION... BRIEF MVFR CONDITIONS WILL BE POSSIBLE ACROSS TJBQ AND TJMZ FROM 31/18-31/23 IN SHRA OR TSRA. PREVAILING VFR CONDITIONS EXPECTED ELSEWHERE. WATCH FOR FREQUENT MOUNTAIN OBSCURATIONS. LLVL WIND FLOW BECAME SE AROUND 10 KTS THIS AFTERNOON. && .MARINE...A 5 TO 6 FOOT NORTHERLY SWELL HAS ARRIVED IN THE AREA AND BOOSTED SOME COMBINED SEAS TO 5 AND 6 FEET. THESE HAVE ALREADY BEGUN TO DIMINISH. SMALL CRAFT ADVISORIES ARE NOT EXPECTED DURING THE NEXT 7 DAYS. && .CLIMATE...MAY 2010 WILL END AS THE FOURTH WETTEST ON RECORD AT THE LMM INTL AIRPORT WITH A TOTAL OF 12.37 INCHES. THE WETTEST MAY ON RECORD WAS IN 1965 WHEN 14.99 INCHES WERE RECORDED. A TOTAL OF 31.06 INCHES OF RAIN HAS BEEN RECORDED AT THE LMM INTL AP IN SJU SINCE THE BEGINNING OF THE YEAR WHICH REPRESENTS THE WETTEST START TO A YEAR ON RECORD. THIS TOTAL IS 1.30 INCHES AHEAD OF 2005 TO THIS DATE WHICH ENDED AS THE WETTEST YEAR ON RECORD IN SAN JUAN. RECORDS AT THE LMM INTL AP DATE BACK TO 1956. MAY 2010 WILL LIKELY END AS THE 11TH WARMEST MAY ON RECORD BUT THIS IS PRELIMINARY AS MINIMUM TEMP AS YET TO OCCUR THIS EVENING. PLEASE MAKE SURE TO CHECK THE HEADLINE SECTION OUR WEB PAGE TUE MORNING FOR MORE CLIMATE STATISTICS. && CLIMATE SECTION...ROSA && .PRELIMINARY POINT TEMPS/POPS... SJU 78 90 79 93 / 30 30 20 20 STT 80 88 80 87 / 40 40 30 30 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 23/12/
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 447 AM AST MON MAY 31 2010 AMZ710>745-PRZ001>013-010900- 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- 447 AM AST MON MAY 31 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT A MOIST AND UNSTABLE AIR MASS WILL RESULT IN ANOTHER ACTIVE WEATHER DAY ACROSS PUERTO RICO TODAY. DUE TO ALREADY SATURATED SOILS...LOCALIZED FLOODING...MAINLY ACROSS THE INTERIOR AND NORTHERN SECTIONS OF PUERTO RICO...CAN BE EXPECTED THIS AFTERNOON. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS ANTICIPATED AT THIS TIME AS A DRIER AND MORE STABLE AIR MASS BEGINS TO FILTER IN ACROSS THE LOCAL ISLANDS. .SPOTTER INFORMATION STATEMENT... SPOTTER REPORTS OF RAINFALL IN EXCESS OF TWO INCHES...LOCALIZED FLOODING OR MUDSLIDES WOULD BE APPRECIATED. AMZ715-725-VIZ001-002-010900- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 447 AM AST MON MAY 31 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY .SPOTTER INFORMATION STATEMENT... SPOTTER REPORTS OF RAINFALL IN EXCESS OF ONE INCH...LOCALIZED FLOODING OR MUDSLIDES WOULD BE APPRECIATED. SR
The national radar mosaic for the moment the first event began.
20 flash flood. Local standard time, as filed.
A home was reported flooded in Barrio Sabana Hoyos, Manantiales sector.
A motor vehicle with three occupants was swept by an overflowing river current as it tried to cross a water covered bridge along PR682 near the Cambalache Forest. Nine homes were also reported flooded with flood water levels estimated at near two feet.
Two homes were reported flooded along road 682 in Barrio Garrochales.
A house was reported flooded at Barrio Espinosa, road 679, Km 1.1.
A home was reported along road 864 at Barrio Pinas in Toa Alta.
Homes were reported flooded at Barrio Los Puertos in Dorado. According to a local newspaper twenty homes were flooded.
A house was reported flooded at Granisco sector, highway 2 near San Juan Cement company.
Homes were reported flooded in sector Los Rabanes, Parcelas Kuilan, Habra and Reparto del Valle in Barrio Espinosa. A total of 100 homes were reported flooded according to a local newspaper.
Several homes and streets were reported flooded in the Arena and San Antonio sectors of Barrio Higuillal. A total of 77 homes were affected by the floods in barrio Higuillar according to a newspaper.
Several homes and roads were reported flooded in Barrio La Ponderosa, Barrio Santa Ana, and at la Inmaculada and Santa Ana neighborhoods.
Several homes and streets were reported flooded at Los Montes neighborhood in Dorado.
A home was reported flooded at Barrio Espinosa,Quilon sector, Km 27, house 79 in the entrance of Gulf gas station.
A home was reported flooded along road 679, in the Fortuna Sector of Barrio Espinosa.
A home was reported flooded at Azucena street, Barrio Ingenio in Toa Baja.
Several streets and homes were reported flooded in Barrio Maguayo Sectors of El Coto and Davila in Dorado. Fifty persons were affected by the floods in Barrio Maguayo according to a local newspaper.
A flooded home was reported on Tulipan street at Barrio Candelaria Arena.
A home was reported flooded at Barrio Ingenio, Flamboyan street.
A home was reported flooded along Highway 2 at the Laguna Sector of Barrio Espinosa.
River Cibuco in Vega Alta was reported overflowing it banks along road 620, 690 and 647.
Road 686 in Los Naranjos sector of Vega Baja was reported flooded due to poor drainage in the water channel that flow out to sea. Three families were evacuated and put into shelters.
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, May 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: 240054, 239292, 240052, 239904, 239991, 240124, 240125, 239977, 239423, 239982, 239377, 240193, 239973, 239994, 239385, 239998, 240008, 239979, 240135, 240141.