Low level disturbance moved across Puerto Rico spreading cloudiness and showers across the island. A few locations received periods of heavy rainfall which resulted in urban and small stream flooding.
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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.
Low level disturbance moved across Puerto Rico spreading cloudiness and showers across the island. A few locations received periods of heavy rainfall which resulted in urban and small stream flooding.
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 7, 3:01 PM AST, 5 hours 4 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 301 PM AST FRI MAY 7 2010 .SYNOPSIS...A LOW LEVEL DISTURBANCE AND ITS ASSOCIATED MOISTURE LOCATED OVER THE EASTERN PORTION OF PUERTO RICO CONTINUES TO MOVE NORTHWEST AWAY FROM THE LOCAL AREA TONIGHT THROUGH SATURDAY. IN ADDITION...A MID LEVEL RIDGE WILL LINGER ACROSS THE LOCAL AREA THROUGH EARLY SATURDAY...WITH A MID LEVEL TROUGH THEN APPROACHING THE LOCAL REGION FROM THE NORTHWEST LATER SATURDAY THROUGH SUNDAY. && .DISCUSSION...A LOW LEVEL DISTURBANCE LOCATED OVER THE EASTERN PORTION OF PUERTO RICO WILL MOVE NORTHWEST AWAY FROM THE LOCAL AREA TONIGHT THROUGH SATURDAY AS DEPICTED BY THE NAM 07/12Z RUN. AT THIS TIME...THE ACTIVE WEATHER HAS REMAINED OVER THE REGIONAL WATERS AND IS MAINLY CONCENTRATED IN AMZ715 AND AMZ725 EAST OF SAINT JOHN. THE DISTURBANCE HAS TAKEN THE FORM OF AN INVERTED U WITH ONE LEG CURRENTLY OVER EASTERN PUERTO RICO AND THE EASTERN LEG WHERE THE ACTIVE WEATHER WAS DESCRIBED. THE AXIS OF THE DISTURBANCE AND ITS ASSOCIATED MOISTURE WILL SPREAD CLOUDINESS AND SCATTERED SHOWERS WESTWARD DURING THE NEXT 24 HOURS. CURRENT MODELS SHOW ACTIVITY GROWING LATER THIS AFTERNOON AND CONTINUING LATER THAN USUAL INTO THE NIGHT. THE GFS HAS NOT CAPTURED THE MESO SCALE STRUCTURE OF THE DISTURBANCE LIKE THE NAM HAS AND THEREFORE IS SPREADING TOO MUCH MOISTURE OVER A WIDE AREA. MOISTURE WILL LINGER ACROSS THE LOCAL AREA SATURDAY THROUGH EARLY SUNDAY AND SHOULD COMBINE WITH AN APPROACHING MID LEVEL TROUGH AND CONVERGENCE OVER WESTERN PUERTO RICO TO PRODUCE ADDITIONAL CLOUDINESS...AND AFTERNOON SHOWERS WITH ISOLATED THUNDERSTORMS SATURDAY. LOOKING AHEAD...TROUGHINESS WILL TEND TO LIFT AND WEAK RIDGING WILL TAKE PLACE EARLY NEXT WEEK...BUT THE AVAILABLE MOISTURE WILL COMBINE WITH LOCAL EFFECTS...TO PRODUCE SOME DIURNALLY INDUCED CLOUDINESS AND SHOWERS EACH AFTERNOON. && .AVIATION... THE INFLUENCE OF A LOW LEVEL DISTURBANCE WILL PRODUCE INTERMITTENT MVFR CONDITIONS AND MOUNTAIN OBSCURATIONS...WHEN THE SHRA PASS BY. THESE CONDS WILL PERSIST ACROSS THE REGION THE REST OF TODAY ACROSS MOST OF THE TAF SITES. WINDS WILL BE MAINLY FROM THE EAST SOUTHEAST AT 10 TO 15 MPH WITH HIGHER GUSTS. && .MARINE...TRANQUIL MARINE CONDITIONS ARE EXPECTED TO PREVAIL THROUGH SUNDAY. LOCALLY ACTIVE WEATHER WILL OCCUR OVER PARTS OF THE REGIONAL WATERS TONIGHT. WINDS AND SEAS ARE EXPECTED TO INCREASE ON LATE TUESDAY THROUGH WEDNESDAY AND SMALL CRAFT ADVISORIES ARE ANTICIPATED IN THE ATLANTIC BEGINNING WEDNESDAY AND SPREADING INTO THE CARIBBEAN WEDNESDAY AFTERNOON AND THURSDAY. && .PRELIMINARY POINT TEMPS/POPS... SJU 76 89 77 90 / 30 30 20 20 STT 79 87 79 87 / 50 50 20 20 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 11/23/12
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 407 AM AST FRI MAY 7 2010 AMZ710>745-PRZ001>013-081000- 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- 407 AM AST FRI MAY 7 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT A PASSING LOW LEVEL DISTURBANCE WILL ENHANCE SHOWER ACTIVITY ACROSS PUERTO RICO TODAY. AREAS OF MODERATE TO HEAVY RAINFALL CAN BE EXPECTED TO DEVELOP ACROSS EASTERN PUERTO RICO LATE THIS MORNING...SPREADING WESTWARD THROUGH THE AFTERNOON HOURS. REDUCED VISIBILITIES...ALONG WITH URBAN AND SMALL STREAM FLOODING...CAN BE EXPECTED WITH THE HEAVIEST SHOWERS AND THUNDERSTORMS TODAY. .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-VIZ001-002-081000- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 407 AM AST FRI MAY 7 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT NUMEROUS SHOWERS...ISOLATED THUNDERSTORMS...TEMPORARILY REDUCED VISIBILITIES AND PONDING OF WATER ON ROADWAYS AND IN LOW LYING AREAS...CAN BE EXPECTED WITH A PASSING LOW LEVEL DISTURBANCE THROUGH THE LATE MORNING HOURS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. SR
The San Juan radar (TJUA), 39 km away, was scanning. The volume nearest the first event began at 00:05 UTC.
5 heavy rain, 2 flash flood. Local standard time, as filed.
Highway 2 in the Espinosa sector was reported flooded.
The Santa Rosa sector of Dorado was reported flooded along road 659 km, 1.6. Five vehicles were reported stranded in water.
Doncella road in the Sultana Sector of Mayaguez was reported flooded.
Bucare road in the Valle Hermoso sector of Hormigueros was reported flooded.
Highway 2 was reported flooded at the intersection of road 319.
Adelis road was reported flooded at Urb. Buena Aventura.
Road Celestino Rodriguez at Bo. Rio Hondo was 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, 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: 228985, 228991, 228992, 228994, 235311, 235309, 235310.