A mid to upper trough north of the area combined with a moist east northeast wind flow to produced scattered to numerous showers across the Puerto Rico.
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.
A mid to upper trough north of the area combined with a moist east northeast wind flow to produced scattered to numerous showers across the Puerto Rico.
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 25, 12:13 PM AST, 2 hours 7 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JUAN PR 1213 PM AST SUN MAR 25 2012 .UPDATE...CONSISTENT WITH THE FORECAST...SHOWERS WERE OBSERVED IN THE MORNING HOURS AND THEY CONTINUE TO AFFECT THE NORTHERN HALF OF PUERTO RICO. THE SHORT TERM GRIDS WERE ADJUSTED BASED ON THE CURRENT CONDITIONS AND THE LATEST GUIDANCE. SO SHOWERS ARE STILL EXPECTED FOR THE REST OF THE DAY...PARTICULARLY ACROSS THE NORTHERN HALF OF PUERTO RICO WITH THUNDERSTORMS DEVELOPING ACROSS THE INTERIOR AND NORTHWESTERN PUERTO RICO LATER IN THE AFTERNOON. && .AVIATION...VFR CONDITIONS ARE GENERALLY EXPECTED ACROSS THE USVI AND PR TERMINALS. HOWEVER...THE SHOWERS ACROSS THE AREA AND POSSIBLE THUNDERSTORM DEVELOPMENT WILL CAUSE MVFR/IFR CONDITIONS. TJMZ AND TJBQ HAS A CHANCE OF TSRA AFTER 25/17Z WHILE SHRA ARE POSSIBLE OVER TJSJ...TIST...AND TISX THROUGH THE REST OF THE DAY. WINDS WILL PREVAIL FROM THE SOUTHEAST AT AROUND 10 KNOTS WITH HIGHER GUSTS NEAR SHOWERS. && .PREV DISCUSSION... /ISSUED 548 AM AST SUN MAR 25 2012/ SYNOPSIS...THE MID TO UPPER TROUGH JUST NORTH OF THE AREA IS EXPECTED TO PERSIST ACROSS THE REGION TODAY. SURFACE HIGH PRESSURE NORTH OF THE AREA IS EXPECTED TO WEAKENS TODAY...INDUCING A MORE EASTERLY OR EAST/SOUTHEASTERLY LOW LEVEL WIND FLOW ACROSS THE LOCAL ISLANDS. SEVERAL LOW LEVEL PERTURBATIONS WILL CONTINUE TO MOVE ACROSS THE LOCAL ISLANDS FROM TIME TO TIME DURING THE NEXT FEW DAYS. DISCUSSION...LATEST SATELLITE AND RADAR IMAGERY THIS MORNING DEPICTED ABUNDANT CLOUDINESS WITH SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ACROSS NORTHERN AND EASTERN SECTIONS OF PUERTO RICO AS WELL AS ACROSS VIEQUES...CULEBRA AND THE U.S. VIRGIN ISLANDS. THESE SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE OVER THOSE SECTOR DURING THE REST OF THE MORNING HOURS. THIS SHOWERY WEATHER IS THE RESULT OF THE INSTABILITY PROVIDED BY A MID TO UPPER LEVEL TROUGH JUST NORTH OF THE REGION THIS MORNING AND A SERIES OF PERTURBATIONS EMBEDDED IN THE TRADE WIND FLOW...MOVING ACROSS THE REGION FROM TIME TO TIME. THE UPPER TROUGH IS EXPECTED TO REMAIN IN A FAVORABLE POSITION...BUT DISSIPATING LATER IN THE DAY OR TONIGHT. PWAT VALUES ARE EXPECTED TO REMAIN IN THE RANGE OF 1.50-1.75 INCHES UNTIL AT LEAST TONIGHT...DECREASING SLIGHTLY AFTER THAT. HOWEVER...THESE VALUES OF PWAT DO NOT SUPPORT THE DEVELOPMENT OF WIDESPREAD PRECIPITATION ACROSS THE FORECAST AREA. FOR THIS AFTERNOON THE AFOREMENTIONED UPPER TROUGH IN COMBINATION WITH DAYTIME HEATING ARE EXPECTED TO INDUCE AGAIN A NEW ROUND OF SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ACROSS PARTS OF THE LOCAL ISLANDS. GIVEN THE EXPECTED SLOW MOTION OF THE STORMS... SHOWERS WILL BE CAPABLE OF PRODUCING PERIODS OF HEAVY RAINFALL. A GRADUAL DRYING TREND IS EXPECTED ON MONDAY AS A WEAK RIDGE OF HIGH PRESSURE BUILDS ALOFT AND THE UPPER TROUGH DISSIPATES. HOWEVER...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED ACROSS WESTERN AND INTERIOR SECTIONS OF PUERTO RICO EACH AFTERNOON. AVIATION...SHRA/ISOLD TSRA WILL CONTINUE TO AFFECT THE LOCAL FLYING AREA THROUGHOUT THE DAY. EXPECT SCT-BKN LOW TO MID LEVEL CLDS MAINLY BTW 020-090K FT...AND TSTMS WITH MAX TOPS NEAR 35K FT. AT LEAST TIL 25/14Z EXPECT TEMPO MVFR CIG/VSBY DUE TO CONVECTIVE ACTIVITY IN AND AROUND...TJNR...TJSJ...TJBQ...TISX AND TIST. SFC WND GUSTS UP TO 30 KNOTS MAY ACCOMPANY THE SHRA/TSRA. MTN TOP OBSCURATIONS IN RA AND LOW FRACTUS CLDS LIKELY ALONG THE HIGHEST PEAKS IN PR. LLVL WND MAINLY FM EAST UP TO NR 10K FT...BCMG WESTERLY AND INCR W/HT ABV 20K FT. ONGOING GAS AND OCNL LGT VA EMISSIONS CONTINUED FROM THE SOUFRIERE HILLS VOLCANO ON MONTSERRAT...HOWEVER VA NOT DISCERNIBLE AT THIS TIME DUE TO CLOUDY CONDS. && .PRELIMINARY POINT TEMPS/POPS... SJU 82 73 83 72 / 70 40 50 10 STT 84 74 83 74 / 70 40 40 10 && .SJU WATCHES/WARNINGS/ADVISORIES... PR...NONE. VI...NONE. COASTAL WATERS...NONE. && 25/06
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 601 AM AST SUN MAR 25 2012 AMZ710>745-PRZ001>013-261015- 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- 601 AM AST SUN MAR 25 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT PERIODS OF MODERATE TO LOCALLY HEAVY RAINFALL WILL REMAIN POSSIBLE ESPECIALLY ALONG THE NORTHERN HALF OF THE ISLAND DURING THE MORNING. THIS WILL BE FOLLOWED BY INCREASING ACTIVITY ACROSS PARTS OF THE CORDILLERA CENTRAL AND WEST SECTIONS OF THE ISLAND DURING THE AFTERNOON. THIS SCENARIO WILL AGAIN RESULT IN QUICK RISES IN RIVERS...STREAMS AND CREEKS...AS WELL AS INCREASE THE POTENTIAL FOR URBAN FLOODING. ALSO...THE THREAT OF MUDSLIDES WILL ALSO CONTINUE IN AREAS OF STEEP TERRAIN WHERE SIGNIFICANT RAINFALL HAS OCCURRED IN RECENT DAYS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER ANTICIPATED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... ANY REPORTS OF SIGNIFICANT WEATHER OR FLOOD PROBLEMS WOULD BE GREATLY APPRECIATED. AMZ715-725-VIZ001-002-261015- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 601 AM AST SUN MAR 25 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT PERIODS OF MODERATE TO LOCALLY HEAVY RAINFALL WILL LIKELY RESULT IN RAPID RISES IN SMALL CREEKS AND GUTS AS WELL AS INCREASE THE POTENTIAL FOR URBAN FLOODING ACROSS SOME OF THE ISLANDS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER ANTICIPATED AT THIS TIME. .SPOTTER INFORMATION STATEMENT...FLOOD REPORTS WOULD BE APPRECIATED GREATLY APPRECIATED.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN JUAN PR 154 PM AST SUN MAR 25 2012 PRC027-065-071-081-115-131-141-251845- HATILLO PR-LARES PR-UTUADO PR-SAN SEBASTIAN PR-ISABELA PR-CAMUY PR- QUEBRADILLAS PR- 154 PM AST SUN MAR 25 2012 AT 147 PM AST...NATIONAL WEATHER DOPPLER RADAR DETECTED A STRONG THUNDERSTORM OVER LARES...MOVING NORTHWEST AT 5 MPH. THIS STORM WILL CONTINUE TO PRODUCE VERY HEAVY RAIN AND FREQUENT LIGHTNING...AND MAY CONTAIN STRONG AND GUSTY WINDS AND SMALL HAIL. INTENSE LIGHTNING IS REPORTED WITH THIS STORM. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES. JJA
COMUNICADO ESPECIAL SOBRE LAS CONDICIONES DEL TIEMPO SERVICIO NACIONAL DE METEOROLOGIA SAN JUAN PR 154 PM AST DOMINGO 25 DE MARZO DE 2012 PRC027-065-071-081-115-131-141-251845- HATILLO PR-LARES PR-UTUADO PR-SAN SEBASTIAN PR-ISABELA PR-CAMUY PR- QUEBRADILLAS PR- 154 PM AST DOMINGO 25 DE MARZO DE 2012 A LA 1:47 PM AST...EL RADAR DOPPLER DETECTO UNA TRONADA FUERTE SOBRE LARES...MOVIENDOSE AL NOROESTE A 5 PMH. ESTA TORMENTA CONTINUARA PRODUCIENDO LLUVIA MUY FUERTE Y RAYOS FRECUENTES Y PUDIERAN CONTENER VIENTOS FUERTES EN RAFAGAS Y GRANIZOS PEQUENOS. SE HAN REPORTADO RAYOS INTENSOS CON ESTA TORMENTA. SI SE ENCUENTRA EN EL EXTERIOR...ALEJESE DE AREAS CON OBJETOS ALTOS TAL COMO ARBOLES. MUEVASE AL INTERIOR DE UN EDIFICIO SI ES POSIBLE. SI ESTA EN EL INTERIOR...ALEJESE DE LAS VENTANAS Y PUERTAS Y EVITE USAR TELEFONOS A MENOS QUE SEA UNA EMERGENCIA. INTENTE DESCONECTAR ENSERES ELECTRICOS QUE NO ESTEN EN USO ANTES DE QUE SE ACERQUE LA TORMENTA. JJA/RVT
The San Juan radar (TJUA), 33 km away, was scanning. The volume nearest the first event began at 18:19 UTC.
2 flash flood, 1 flood. Local standard time, as filed.
Road 31 interception with exit 21 of highway 53 was closed in Barrio Rio Blanco due to river out of its banks.
Road 956 intersection with road 960 closed due to river out of its banks.
Rio Fajardo was reported out of its banks over road PR-3.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2012Every state in 2012This day in weather historyWarnings in Puerto Rico, March 2012
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: 364747, 364609, 364746.