An induced low level trough combined with ample moisture to produce scattered heavy slow moving showers across north central Puerto Rico. Radar estimated rainfall amounts of 3 to 5 inches mainly over the municipality of Dorado.
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.
An induced low level trough combined with ample moisture to produce scattered heavy slow moving showers across north central Puerto Rico. Radar estimated rainfall amounts of 3 to 5 inches mainly over the municipality of Dorado.
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 Mar 29, 2:27 PM AST, 1 hour 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 227 PM AST TUE MAR 29 2011 .SYNOPSIS...A LOW LEVEL DISTURBANCE NOW LOCATED OVER THE LESSER ANTILLES WILL CONTINUE TO MOVE WEST...BRINGING AN INCREASE IN CLOUD AND SHOWER COVERAGE ACROSS THE FORECAST AREA LATE THIS EVENING AND WEDNESDAY. A SURFACE RIDGE ACROSS THE EASTERN ATLANTIC WILL MAINTAIN A MODERATE TO LOCALLY FRESH TRADE WIND FLOW THROUGH THE END OF THE WEEK. && .DISCUSSION...ISOLATED TO SCATTERED SHOWERS...SOME OF THE WITH LOCALLY HEAVY RAINFALL...ARE EXPECTED ACROSS THE CORDILLERA CENTRAL AND NORTHERN SLOPES OF PUERTO RICO THIS AFTERNOON AS A RESULT OF AVAILABLE MOISTURE COMBINED WITH LOCAL EFFECTS AND DIURNAL HEATING. THESE SHOWERS SHOULD DISSIPATED AFTER SUNSET. AN INDUCED LOW LEVEL TROUGH/EASTERLY PERTURBATION AND ACCOMPANYING MOISTURE IS EXPECTED TO REACH THE LOCAL AREA LATE THIS EVENING AND WEDNESDAY. AN INCREASE AND ENHANCEMENT OF THE EARLY MORNING AND AFTERNOON CONVECTION ACROSS PARTS OF THE LOCAL ISLANDS IS THEREFORE EXPECTED OVERNIGHT AND WEDNESDAY. HOWEVER...WIDESPREAD PRECIPITATION IS NOT EXPECTED AT THIS TIME. LATE THURSDAY THROUGH AT LEAST SUNDAY...LIGHT MORNING SHOWERS EMBEDDED IN THE TRADES ACROSS THE WINDWARD SIDE OF THE LOCAL ISLANDS...WITH LIMITED AFTERNOON CONVECTION CAN BE EXPECTED EACH DAY. LOOKING AHEAD...A COLD FRONT IS EXPECTED TO EXIT THE U.S. COAST DURING THE WEEKEND...AND IS FORECAST TO APPROACH THE LOCAL AREA EARLY NEXT WEEK. ALTHOUGH THIS FRONT IS NOT EXPECTED TO AFFECT THE LOCAL AREA AT THIS TIME...THE PROXIMITY OF THIS FEATURE WILL INDUCE A SHIFT IN THE WIND DIRECTION TO A MORE SOUTHERLY COMPONENT. AS A RESULT...HIGHER THAN NORMAL TEMPERATURES ARE LIKELY. && .AVIATION...MOSTLY SCT-BKN LYRS OF LOW TO MID LEVEL CLDS MAINLY BTW 020-100K FT WILL CONTINUE TO MOVE WESTWARD ACROSS THE LOCAL FLYING AREA THROUGH THE EVENING AND OVERNIGHT HOURS. EMBEDDED -SHRA/SHRA WILL LEAD TO TEMPO MVFR CONDS AS THESE...ALONG WITH AFTN SHRA WHICH WILL DEVELOP ACROSS THE INTERIOR SECTIONS OF PUERTO RICO...MOVE ACROSS PARTS OF THE ISLANDS AND SURROUNDING WATERS DURG THE NXT 24 HRS. OVERALL VFR CONDS WILL PERSIST AT LCL TAF SITES EXCEPT FOR BRIEF MVFR CONDS AT TJSJ...TJBQ...TJMZ AT LEAST UNTIL 29/23Z. TEMPO MVFR CONDS EXPECTED VCNTY AND EN ROUTE TO VI FM 30/04Z-30/12Z DUE TO BRIEF PASSING SHRA AND LOW CIGS. && .MARINE...TRANQUIL MARINE CONDITIONS ARE EXPECTED TO PREVAIL FOR THE NEXT FEW DAYS ACROSS THE REGIONAL WATERS. && .PRELIMINARY POINT TEMPS/POPS... SJU 73 84 74 85 / 40 40 30 20 STT 73 83 76 84 / 60 30 20 10 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. && 09/23
HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS NATIONAL WEATHER SERVICE SAN JUAN PR 535 AM AST TUE MAR 29 2011 AMZ710>745-PRZ001>013-300945- 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- 535 AM AST TUE MAR 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT A LOW LEVEL DISTURBANCE NOW LOCATED OVER THE LESSER ANTILLES WILL CONTINUE TO MOVE WESTWARD...BRINGING PATCHES OF MOISTURE ACROSS THE LOCAL ISLANDS FROM TIME TO TIME TODAY. THEREFORE...ISOLATED TO SCATTERED SHOWERS...SOME OF THEM WITH LOCALLY HEAVY RAINFALL..AND ISOLATED THUNDERSTORMS ARE EXPECTED ACROSS THE CORDILLERA CENTRAL AND WESTERN PORTIONS OF PUERTO RICO AS A RESULT OF AVAILABLE MOISTURE COMBINED WITH LOCAL EFFECTS AND DIURNAL HEATING. HOWEVER...WIDESPREAD PRECIPITATION IS NOT EXPECTED AT THIS TIME. MINOR PONDING OF WATER ON ROADWAYS AND IN LOW LYING AREAS CAN BE EXPECTED. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. AMZ715-725-VIZ001-002-300945- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 535 AM AST TUE MAR 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT A LOW LEVEL DISTURBANCE NOW LOCATED OVER THE LESSER ANTILLES WILL CONTINUE TO MOVE WESTWARD...BRINGING PATCHES OF MOISTURE ACROSS THE LOCAL ISLANDS FROM TIME TO TIME TODAY. THEREFORE ISOLATED TO SCATTERED PASSING SHOWERS ARE EXPECTED...AS A RESULT OF AVAILABLE MOISTURE COMBINED WITH LOCAL EFFECTS AND DIURNAL HEATING. HOWEVER...WIDESPREAD PRECIPITATION IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Urban flooding was reported in Dorado. Several roads in Barrio Higuillar, Barrio Puertos, Dorado Del Mar neighborhood, downtown streets and exit ramps of highway PR-22 were flooded.
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, March 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: 289234.